Updated to pybind11 2.2.2

dlib/external/pybind11/README.md

@@ -87,8 +87,9 @@ In addition to the core functionality, pybind11 provides some extra goodies:
   [reported](http://graylab.jhu.edu/RosettaCon2016/PyRosetta-4.pdf) a binary
   size reduction of **5.4x** and compile time reduction by **5.8x**.
 
-- Function signatures are precomputed at compile time (using ``constexpr``),
-  leading to smaller binaries.
+- When supported by the compiler, two new C++14 features (relaxed constexpr and
+  return value deduction) are used to precompute function signatures at compile
+  time, leading to smaller binaries.
 
 - With little extra effort, C++ types can be pickled and unpickled similar to
   regular Python objects.

dlib/external/pybind11/include/pybind11/cast.h

@@ -778,7 +778,7 @@ template <typename T1, typename T2> struct is_copy_constructible<std::pair<T1, T
 template <typename type> class type_caster_base : public type_caster_generic {
     using itype = intrinsic_t<type>;
 public:
-    static constexpr auto name = _<type>();
+    static PYBIND11_DESCR name() { return type_descr(_<type>()); }
 
     type_caster_base() : type_caster_base(typeid(type)) { }
     explicit type_caster_base(const std::type_info &info) : type_caster_generic(info) { }
@@ -835,7 +835,7 @@ public:
             nullptr, nullptr, holder);
     }
 
-    template <typename T> using cast_op_type = detail::cast_op_type<T>;
+    template <typename T> using cast_op_type = cast_op_type<T>;
 
     operator itype*() { return (type *) value; }
     operator itype&() { if (!value) throw reference_cast_error(); return *((itype *) value); }
@@ -885,7 +885,7 @@ private:
             "std::reference_wrapper<T> caster requires T to have a caster with an `T &` operator");
 public:
     bool load(handle src, bool convert) { return subcaster.load(src, convert); }
-    static constexpr auto name = caster_t::name;
+    static PYBIND11_DESCR name() { return caster_t::name(); }
     static handle cast(const std::reference_wrapper<type> &src, return_value_policy policy, handle parent) {
         // It is definitely wrong to take ownership of this pointer, so mask that rvp
         if (policy == return_value_policy::take_ownership || policy == return_value_policy::automatic)
@@ -900,7 +900,7 @@ public:
     protected: \
         type value; \
     public: \
-        static constexpr auto name = py_name; \
+        static PYBIND11_DESCR name() { return type_descr(py_name); } \
         template <typename T_, enable_if_t<std::is_same<type, remove_cv_t<T_>>::value, int> = 0> \
         static handle cast(T_ *src, return_value_policy policy, handle parent) { \
             if (!src) return none().release(); \
@@ -980,12 +980,11 @@ public:
     static handle cast(T src, return_value_policy /* policy */, handle /* parent */) {
         if (std::is_floating_point<T>::value) {
             return PyFloat_FromDouble((double) src);
-        } else if (sizeof(T) <= sizeof(ssize_t)) {
-            // This returns a long automatically if needed
+        } else if (sizeof(T) <= sizeof(long)) {
             if (std::is_signed<T>::value)
-                return PYBIND11_LONG_FROM_SIGNED(src);
+                return PyLong_FromLong((long) src);
             else
-                return PYBIND11_LONG_FROM_UNSIGNED(src);
+                return PyLong_FromUnsignedLong((unsigned long) src);
         } else {
             if (std::is_signed<T>::value)
                 return PyLong_FromLongLong((long long) src);
@@ -1050,7 +1049,7 @@ public:
 
     template <typename T> using cast_op_type = void*&;
     operator void *&() { return value; }
-    static constexpr auto name = _("capsule");
+    static PYBIND11_DESCR name() { return type_descr(_("capsule")); }
 private:
     void *value = nullptr;
 };
@@ -1293,7 +1292,7 @@ public:
         return one_char;
     }
 
-    static constexpr auto name = _(PYBIND11_STRING_NAME);
+    static PYBIND11_DESCR name() { return type_descr(_(PYBIND11_STRING_NAME)); }
     template <typename _T> using cast_op_type = pybind11::detail::cast_op_type<_T>;
 };
 
@@ -1318,7 +1317,9 @@ public:
         return cast_impl(std::forward<T>(src), policy, parent, indices{});
     }
 
-    static constexpr auto name = _("Tuple[") + concat(make_caster<Ts>::name...) + _("]");
+    static PYBIND11_DESCR name() {
+        return type_descr(_("Tuple[") + detail::concat(make_caster<Ts>::name()...) + _("]"));
+    }
 
     template <typename T> using cast_op_type = type;
 
@@ -1463,7 +1464,7 @@ struct move_only_holder_caster {
         auto *ptr = holder_helper<holder_type>::get(src);
         return type_caster_base<type>::cast_holder(ptr, &src);
     }
-    static constexpr auto name = type_caster_base<type>::name;
+    static PYBIND11_DESCR name() { return type_caster_base<type>::name(); }
 };
 
 template <typename type, typename deleter>
@@ -1494,10 +1495,10 @@ template <typename base, typename holder> struct is_holder_type :
 template <typename base, typename deleter> struct is_holder_type<base, std::unique_ptr<base, deleter>> :
     std::true_type {};
 
-template <typename T> struct handle_type_name { static constexpr auto name = _<T>(); };
-template <> struct handle_type_name<bytes> { static constexpr auto name = _(PYBIND11_BYTES_NAME); };
-template <> struct handle_type_name<args> { static constexpr auto name = _("*args"); };
-template <> struct handle_type_name<kwargs> { static constexpr auto name = _("**kwargs"); };
+template <typename T> struct handle_type_name { static PYBIND11_DESCR name() { return _<T>(); } };
+template <> struct handle_type_name<bytes> { static PYBIND11_DESCR name() { return _(PYBIND11_BYTES_NAME); } };
+template <> struct handle_type_name<args> { static PYBIND11_DESCR name() { return _("*args"); } };
+template <> struct handle_type_name<kwargs> { static PYBIND11_DESCR name() { return _("**kwargs"); } };
 
 template <typename type>
 struct pyobject_caster {
@@ -1515,7 +1516,7 @@ struct pyobject_caster {
     static handle cast(const handle &src, return_value_policy /* policy */, handle /* parent */) {
         return src.inc_ref();
     }
-    PYBIND11_TYPE_CASTER(type, handle_type_name<type>::name);
+    PYBIND11_TYPE_CASTER(type, handle_type_name<type>::name());
 };
 
 template <typename T>
@@ -1685,6 +1686,9 @@ template <> inline void cast_safe<void>(object &&) {}
 
 NAMESPACE_END(detail)
 
+template <return_value_policy policy = return_value_policy::automatic_reference>
+tuple make_tuple() { return tuple(0); }
+
 template <return_value_policy policy = return_value_policy::automatic_reference,
           typename... Args> tuple make_tuple(Args&&... args_) {
     constexpr size_t size = sizeof...(Args);
@@ -1801,6 +1805,10 @@ struct function_call {
     /// The `convert` value the arguments should be loaded with
     std::vector<bool> args_convert;
 
+    /// Extra references for the optional `py::args` and/or `py::kwargs` arguments (which, if
+    /// present, are also in `args` but without a reference).
+    object args_ref, kwargs_ref;
+
     /// The parent, if any
     handle parent;
 
@@ -1828,7 +1836,7 @@ public:
     static constexpr bool has_kwargs = kwargs_pos < 0;
     static constexpr bool has_args = args_pos < 0;
 
-    static constexpr auto arg_names = concat(type_descr(make_caster<Args>::name)...);
+    static PYBIND11_DESCR arg_names() { return detail::concat(make_caster<Args>::name()...); }
 
     bool load_args(function_call &call) {
         return load_impl_sequence(call, indices{});

dlib/external/pybind11/include/pybind11/complex.h

@@ -25,13 +25,9 @@ template <typename T> struct format_descriptor<std::complex<T>, detail::enable_i
     static std::string format() { return std::string(value); }
 };
 
-#ifndef PYBIND11_CPP17
-
 template <typename T> constexpr const char format_descriptor<
     std::complex<T>, detail::enable_if_t<std::is_floating_point<T>::value>>::value[3];
 
-#endif
-
 NAMESPACE_BEGIN(detail)
 
 template <typename T> struct is_fmt_numeric<std::complex<T>, detail::enable_if_t<std::is_floating_point<T>::value>> {

dlib/external/pybind11/include/pybind11/detail/class.h

@@ -289,9 +289,13 @@ extern "C" inline int pybind11_object_init(PyObject *self, PyObject *, PyObject
 inline void add_patient(PyObject *nurse, PyObject *patient) {
     auto &internals = get_internals();
     auto instance = reinterpret_cast<detail::instance *>(nurse);
+    auto &current_patients = internals.patients[nurse];
     instance->has_patients = true;
+    for (auto &p : current_patients)
+        if (p == patient)
+            return;
     Py_INCREF(patient);
-    internals.patients[nurse].push_back(patient);
+    current_patients.push_back(patient);
 }
 
 inline void clear_patients(PyObject *self) {

dlib/external/pybind11/include/pybind11/detail/common.h

@@ -92,8 +92,8 @@
 #endif
 
 #define PYBIND11_VERSION_MAJOR 2
-#define PYBIND11_VERSION_MINOR 3
-#define PYBIND11_VERSION_PATCH dev0
+#define PYBIND11_VERSION_MINOR 2
+#define PYBIND11_VERSION_PATCH 2
 
 /// Include Python header, disable linking to pythonX_d.lib on Windows in debug mode
 #if defined(_MSC_VER)
@@ -158,8 +158,6 @@
 #define PYBIND11_BYTES_SIZE PyBytes_Size
 #define PYBIND11_LONG_CHECK(o) PyLong_Check(o)
 #define PYBIND11_LONG_AS_LONGLONG(o) PyLong_AsLongLong(o)
-#define PYBIND11_LONG_FROM_SIGNED(o) PyLong_FromSsize_t((ssize_t) o)
-#define PYBIND11_LONG_FROM_UNSIGNED(o) PyLong_FromSize_t((size_t) o)
 #define PYBIND11_BYTES_NAME "bytes"
 #define PYBIND11_STRING_NAME "str"
 #define PYBIND11_SLICE_OBJECT PyObject
@@ -182,8 +180,6 @@
 #define PYBIND11_BYTES_SIZE PyString_Size
 #define PYBIND11_LONG_CHECK(o) (PyInt_Check(o) || PyLong_Check(o))
 #define PYBIND11_LONG_AS_LONGLONG(o) (PyInt_Check(o) ? (long long) PyLong_AsLong(o) : PyLong_AsLongLong(o))
-#define PYBIND11_LONG_FROM_SIGNED(o) PyInt_FromSsize_t((ssize_t) o) // Returns long if needed.
-#define PYBIND11_LONG_FROM_UNSIGNED(o) PyInt_FromSize_t((size_t) o) // Returns long if needed.
 #define PYBIND11_BYTES_NAME "str"
 #define PYBIND11_STRING_NAME "unicode"
 #define PYBIND11_SLICE_OBJECT PySliceObject
@@ -381,18 +377,20 @@ constexpr size_t instance_simple_holder_in_ptrs() {
 struct type_info;
 struct value_and_holder;
 
+struct nonsimple_values_and_holders {
+    void **values_and_holders;
+    uint8_t *status;
+};
+
 /// The 'instance' type which needs to be standard layout (need to be able to use 'offsetof')
 struct instance {
     PyObject_HEAD
     /// Storage for pointers and holder; see simple_layout, below, for a description
     union {
         void *simple_value_holder[1 + instance_simple_holder_in_ptrs()];
-        struct {
-            void **values_and_holders;
-            uint8_t *status;
-        } nonsimple;
+        nonsimple_values_and_holders nonsimple;
     };
-    /// Weak references
+    /// Weak references (needed for keep alive):
     PyObject *weakrefs;
     /// If true, the pointer is owned which means we're free to manage it with a holder.
     bool owned : 1;
@@ -409,10 +407,10 @@ struct instance {
      * (which is typically the size of two pointers), or when multiple inheritance is used on the
      * python side.  Non-simple layout allocates the required amount of memory to have multiple
      * bound C++ classes as parents.  Under this layout, `nonsimple.values_and_holders` is set to a
-     * pointer to allocated space of the required space to hold a sequence of value pointers and
+     * pointer to allocated space of the required space to hold a a sequence of value pointers and
      * holders followed `status`, a set of bit flags (1 byte each), i.e.
      * [val1*][holder1][val2*][holder2]...[bb...]  where each [block] is rounded up to a multiple of
-     * `sizeof(void *)`.  `nonsimple.status` is, for convenience, a pointer to the
+     * `sizeof(void *)`.  `nonsimple.holder_constructed` is, for convenience, a pointer to the
      * beginning of the [bb...] block (but not independently allocated).
      *
      * Status bits indicate whether the associated holder is constructed (&
@@ -585,11 +583,6 @@ template <typename T, typename... Us> using deferred_t = typename deferred_type<
 template <typename Base, typename Derived> using is_strict_base_of = bool_constant<
     std::is_base_of<Base, Derived>::value && !std::is_same<Base, Derived>::value>;
 
-/// Like is_base_of, but also requires that the base type is accessible (i.e. that a Derived pointer
-/// can be converted to a Base pointer)
-template <typename Base, typename Derived> using is_accessible_base_of = bool_constant<
-    std::is_base_of<Base, Derived>::value && std::is_convertible<Derived *, Base *>::value>;
-
 template <template<typename...> class Base>
 struct is_template_base_of_impl {
     template <typename... Us> static std::true_type check(Base<Us...> *);
@@ -708,13 +701,9 @@ template <typename T> struct format_descriptor<T, detail::enable_if_t<std::is_ar
     static std::string format() { return std::string(1, c); }
 };
 
-#if !defined(PYBIND11_CPP17)
-
 template <typename T> constexpr const char format_descriptor<
     T, detail::enable_if_t<std::is_arithmetic<T>::value>>::value[2];
 
-#endif
-
 /// RAII wrapper that temporarily clears any Python error state
 struct error_scope {
     PyObject *type, *value, *trace;

dlib/external/pybind11/include/pybind11/detail/descr.h

 /*
-    pybind11/detail/descr.h: Helper type for concatenating type signatures at compile time
+    pybind11/detail/descr.h: Helper type for concatenating type signatures
+    either at runtime (C++11) or compile time (C++14)
 
     Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
 
@@ -14,87 +15,171 @@
 NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
 NAMESPACE_BEGIN(detail)
 
-#if !defined(_MSC_VER)
-#  define PYBIND11_DESCR_CONSTEXPR static constexpr
-#else
-#  define PYBIND11_DESCR_CONSTEXPR const
-#endif
-
-/* Concatenate type signatures at compile time */
-template <size_t N, typename... Ts>
-struct descr {
-    char text[N + 1];
-
-    constexpr descr() : text{'\0'} { }
-    constexpr descr(char const (&s)[N+1]) : descr(s, make_index_sequence<N>()) { }
-
-    template <size_t... Is>
-    constexpr descr(char const (&s)[N+1], index_sequence<Is...>) : text{s[Is]..., '\0'} { }
-
-    template <typename... Chars>
-    constexpr descr(char c, Chars... cs) : text{c, static_cast<char>(cs)..., '\0'} { }
+/* Concatenate type signatures at compile time using C++14 */
+#if defined(PYBIND11_CPP14) && !defined(_MSC_VER)
+#define PYBIND11_CONSTEXPR_DESCR
+
+template <size_t Size1, size_t Size2> class descr {
+    template <size_t Size1_, size_t Size2_> friend class descr;
+public:
+    constexpr descr(char const (&text) [Size1+1], const std::type_info * const (&types)[Size2+1])
+        : descr(text, types,
+                make_index_sequence<Size1>(),
+                make_index_sequence<Size2>()) { }
+
+    constexpr const char *text() const { return m_text; }
+    constexpr const std::type_info * const * types() const { return m_types; }
+
+    template <size_t OtherSize1, size_t OtherSize2>
+    constexpr descr<Size1 + OtherSize1, Size2 + OtherSize2> operator+(const descr<OtherSize1, OtherSize2> &other) const {
+        return concat(other,
+                      make_index_sequence<Size1>(),
+                      make_index_sequence<Size2>(),
+                      make_index_sequence<OtherSize1>(),
+                      make_index_sequence<OtherSize2>());
+    }
 
-    static constexpr std::array<const std::type_info *, sizeof...(Ts) + 1> types() {
-        return {{&typeid(Ts)..., nullptr}};
+protected:
+    template <size_t... Indices1, size_t... Indices2>
+    constexpr descr(
+        char const (&text) [Size1+1],
+        const std::type_info * const (&types) [Size2+1],
+        index_sequence<Indices1...>, index_sequence<Indices2...>)
+        : m_text{text[Indices1]..., '\0'},
+          m_types{types[Indices2]...,  nullptr } {}
+
+    template <size_t OtherSize1, size_t OtherSize2, size_t... Indices1,
+              size_t... Indices2, size_t... OtherIndices1, size_t... OtherIndices2>
+    constexpr descr<Size1 + OtherSize1, Size2 + OtherSize2>
+    concat(const descr<OtherSize1, OtherSize2> &other,
+           index_sequence<Indices1...>, index_sequence<Indices2...>,
+           index_sequence<OtherIndices1...>, index_sequence<OtherIndices2...>) const {
+        return descr<Size1 + OtherSize1, Size2 + OtherSize2>(
+            { m_text[Indices1]..., other.m_text[OtherIndices1]..., '\0' },
+            { m_types[Indices2]..., other.m_types[OtherIndices2]..., nullptr }
+        );
     }
-};
 
-template <size_t N1, size_t N2, typename... Ts1, typename... Ts2, size_t... Is1, size_t... Is2>
-constexpr descr<N1 + N2, Ts1..., Ts2...> plus_impl(const descr<N1, Ts1...> &a, const descr<N2, Ts2...> &b,
-                                                   index_sequence<Is1...>, index_sequence<Is2...>) {
-    return {a.text[Is1]..., b.text[Is2]...};
-}
+protected:
+    char m_text[Size1 + 1];
+    const std::type_info * m_types[Size2 + 1];
+};
 
-template <size_t N1, size_t N2, typename... Ts1, typename... Ts2>
-constexpr descr<N1 + N2, Ts1..., Ts2...> operator+(const descr<N1, Ts1...> &a, const descr<N2, Ts2...> &b) {
-    return plus_impl(a, b, make_index_sequence<N1>(), make_index_sequence<N2>());
+template <size_t Size> constexpr descr<Size - 1, 0> _(char const(&text)[Size]) {
+    return descr<Size - 1, 0>(text, { nullptr });
 }
 
-template <size_t N>
-constexpr descr<N - 1> _(char const(&text)[N]) { return descr<N - 1>(text); }
-constexpr descr<0> _(char const(&)[1]) { return {}; }
-
 template <size_t Rem, size_t... Digits> struct int_to_str : int_to_str<Rem/10, Rem%10, Digits...> { };
 template <size_t...Digits> struct int_to_str<0, Digits...> {
-    static constexpr auto digits = descr<sizeof...(Digits)>(('0' + Digits)...);
+    static constexpr auto digits = descr<sizeof...(Digits), 0>({ ('0' + Digits)..., '\0' }, { nullptr });
 };
 
 // Ternary description (like std::conditional)
-template <bool B, size_t N1, size_t N2>
-constexpr enable_if_t<B, descr<N1 - 1>> _(char const(&text1)[N1], char const(&)[N2]) {
+template <bool B, size_t Size1, size_t Size2>
+constexpr enable_if_t<B, descr<Size1 - 1, 0>> _(char const(&text1)[Size1], char const(&)[Size2]) {
     return _(text1);
 }
-template <bool B, size_t N1, size_t N2>
-constexpr enable_if_t<!B, descr<N2 - 1>> _(char const(&)[N1], char const(&text2)[N2]) {
+template <bool B, size_t Size1, size_t Size2>
+constexpr enable_if_t<!B, descr<Size2 - 1, 0>> _(char const(&)[Size1], char const(&text2)[Size2]) {
     return _(text2);
 }
-
-template <bool B, typename T1, typename T2>
-constexpr enable_if_t<B, T1> _(const T1 &d, const T2 &) { return d; }
-template <bool B, typename T1, typename T2>
-constexpr enable_if_t<!B, T2> _(const T1 &, const T2 &d) { return d; }
+template <bool B, size_t SizeA1, size_t SizeA2, size_t SizeB1, size_t SizeB2>
+constexpr enable_if_t<B, descr<SizeA1, SizeA2>> _(descr<SizeA1, SizeA2> d, descr<SizeB1, SizeB2>) { return d; }
+template <bool B, size_t SizeA1, size_t SizeA2, size_t SizeB1, size_t SizeB2>
+constexpr enable_if_t<!B, descr<SizeB1, SizeB2>> _(descr<SizeA1, SizeA2>, descr<SizeB1, SizeB2> d) { return d; }
 
 template <size_t Size> auto constexpr _() -> decltype(int_to_str<Size / 10, Size % 10>::digits) {
     return int_to_str<Size / 10, Size % 10>::digits;
 }
 
-template <typename Type> constexpr descr<1, Type> _() { return {'%'}; }
+template <typename Type> constexpr descr<1, 1> _() {
+    return descr<1, 1>({ '%', '\0' }, { &typeid(Type), nullptr });
+}
+
+inline constexpr descr<0, 0> concat() { return _(""); }
+template <size_t Size1, size_t Size2, typename... Args> auto constexpr concat(descr<Size1, Size2> descr) { return descr; }
+template <size_t Size1, size_t Size2, typename... Args> auto constexpr concat(descr<Size1, Size2> descr, Args&&... args) { return descr + _(", ") + concat(args...); }
+template <size_t Size1, size_t Size2> auto constexpr type_descr(descr<Size1, Size2> descr) { return _("{") + descr + _("}"); }
+
+#define PYBIND11_DESCR constexpr auto
+
+#else /* Simpler C++11 implementation based on run-time memory allocation and copying */
+
+class descr {
+public:
+    PYBIND11_NOINLINE descr(const char *text, const std::type_info * const * types) {
+        size_t nChars = len(text), nTypes = len(types);
+        m_text  = new char[nChars];
+        m_types = new const std::type_info *[nTypes];
+        memcpy(m_text, text, nChars * sizeof(char));
+        memcpy(m_types, types, nTypes * sizeof(const std::type_info *));
+    }
+
+    PYBIND11_NOINLINE descr operator+(descr &&d2) && {
+        descr r;
+
+        size_t nChars1 = len(m_text),    nTypes1 = len(m_types);
+        size_t nChars2 = len(d2.m_text), nTypes2 = len(d2.m_types);
+
+        r.m_text  = new char[nChars1 + nChars2 - 1];
+        r.m_types = new const std::type_info *[nTypes1 + nTypes2 - 1];
+        memcpy(r.m_text, m_text, (nChars1-1) * sizeof(char));
+        memcpy(r.m_text + nChars1 - 1, d2.m_text, nChars2 * sizeof(char));
+        memcpy(r.m_types, m_types, (nTypes1-1) * sizeof(std::type_info *));
+        memcpy(r.m_types + nTypes1 - 1, d2.m_types, nTypes2 * sizeof(std::type_info *));
 
-constexpr descr<0> concat() { return {}; }
+        delete[] m_text;    delete[] m_types;
+        delete[] d2.m_text; delete[] d2.m_types;
+
+        return r;
+    }
 
-template <size_t N, typename... Ts>
-constexpr descr<N, Ts...> concat(const descr<N, Ts...> &descr) { return descr; }
+    char *text() { return m_text; }
+    const std::type_info * * types() { return m_types; }
 
-template <size_t N, typename... Ts, typename... Args>
-constexpr auto concat(const descr<N, Ts...> &d, const Args &...args)
-    -> decltype(std::declval<descr<N + 2, Ts...>>() + concat(args...)) {
-    return d + _(", ") + concat(args...);
+protected:
+    PYBIND11_NOINLINE descr() { }
+
+    template <typename T> static size_t len(const T *ptr) { // return length including null termination
+        const T *it = ptr;
+        while (*it++ != (T) 0)
+            ;
+        return static_cast<size_t>(it - ptr);
+    }
+
+    const std::type_info **m_types = nullptr;
+    char *m_text = nullptr;
+};
+
+/* The 'PYBIND11_NOINLINE inline' combinations below are intentional to get the desired linkage while producing as little object code as possible */
+
+PYBIND11_NOINLINE inline descr _(const char *text) {
+    const std::type_info *types[1] = { nullptr };
+    return descr(text, types);
+}
+
+template <bool B> PYBIND11_NOINLINE enable_if_t<B, descr> _(const char *text1, const char *) { return _(text1); }
+template <bool B> PYBIND11_NOINLINE enable_if_t<!B, descr> _(char const *, const char *text2) { return _(text2); }
+template <bool B> PYBIND11_NOINLINE enable_if_t<B, descr> _(descr d, descr) { return d; }
+template <bool B> PYBIND11_NOINLINE enable_if_t<!B, descr> _(descr, descr d) { return d; }
+
+template <typename Type> PYBIND11_NOINLINE descr _() {
+    const std::type_info *types[2] = { &typeid(Type), nullptr };
+    return descr("%", types);
 }
 
-template <size_t N, typename... Ts>
-constexpr descr<N + 2, Ts...> type_descr(const descr<N, Ts...> &descr) {
-    return _("{") + descr + _("}");
+template <size_t Size> PYBIND11_NOINLINE descr _() {
+    const std::type_info *types[1] = { nullptr };
+    return descr(std::to_string(Size).c_str(), types);
 }
 
+PYBIND11_NOINLINE inline descr concat() { return _(""); }
+PYBIND11_NOINLINE inline descr concat(descr &&d) { return d; }
+template <typename... Args> PYBIND11_NOINLINE descr concat(descr &&d, Args&&... args) { return std::move(d) + _(", ") + concat(std::forward<Args>(args)...); }
+PYBIND11_NOINLINE inline descr type_descr(descr&& d) { return _("{") + std::move(d) + _("}"); }
+
+#define PYBIND11_DESCR ::pybind11::detail::descr
+#endif
+
 NAMESPACE_END(detail)
 NAMESPACE_END(PYBIND11_NAMESPACE)

dlib/external/pybind11/include/pybind11/detail/init.h

@@ -24,7 +24,7 @@ public:
 
     template <typename> using cast_op_type = value_and_holder &;
     operator value_and_holder &() { return *value; }
-    static constexpr auto name = _<value_and_holder>();
+    static PYBIND11_DESCR name() { return type_descr(_<value_and_holder>()); }
 
 private:
     value_and_holder *value = nullptr;
@@ -52,6 +52,16 @@ bool is_alias(Cpp<Class> *ptr) {
 template <typename /*Class*/>
 constexpr bool is_alias(void *) { return false; }
 
+// Constructs and returns a new object; if the given arguments don't map to a constructor, we fall
+// back to brace aggregate initiailization so that for aggregate initialization can be used with
+// py::init, e.g.  `py::init<int, int>` to initialize a `struct T { int a; int b; }`.  For
+// non-aggregate types, we need to use an ordinary T(...) constructor (invoking as `T{...}` usually
+// works, but will not do the expected thing when `T` has an `initializer_list<T>` constructor).
+template <typename Class, typename... Args, detail::enable_if_t<std::is_constructible<Class, Args...>::value, int> = 0>
+inline Class *construct_or_initialize(Args &&...args) { return new Class(std::forward<Args>(args)...); }
+template <typename Class, typename... Args, detail::enable_if_t<!std::is_constructible<Class, Args...>::value, int> = 0>
+inline Class *construct_or_initialize(Args &&...args) { return new Class{std::forward<Args>(args)...}; }
+
 // Attempts to constructs an alias using a `Alias(Cpp &&)` constructor.  This allows types with
 // an alias to provide only a single Cpp factory function as long as the Alias can be
 // constructed from an rvalue reference of the base Cpp type.  This means that Alias classes
@@ -161,7 +171,7 @@ struct constructor {
     template <typename Class, typename... Extra, enable_if_t<!Class::has_alias, int> = 0>
     static void execute(Class &cl, const Extra&... extra) {
         cl.def("__init__", [](value_and_holder &v_h, Args... args) {
-            v_h.value_ptr() = new Cpp<Class>{std::forward<Args>(args)...};
+            v_h.value_ptr() = construct_or_initialize<Cpp<Class>>(std::forward<Args>(args)...);
         }, is_new_style_constructor(), extra...);
     }
 
@@ -171,9 +181,9 @@ struct constructor {
     static void execute(Class &cl, const Extra&... extra) {
         cl.def("__init__", [](value_and_holder &v_h, Args... args) {
             if (Py_TYPE(v_h.inst) == v_h.type->type)
-                v_h.value_ptr() = new Cpp<Class>{std::forward<Args>(args)...};
+                v_h.value_ptr() = construct_or_initialize<Cpp<Class>>(std::forward<Args>(args)...);
             else
-                v_h.value_ptr() = new Alias<Class>{std::forward<Args>(args)...};
+                v_h.value_ptr() = construct_or_initialize<Alias<Class>>(std::forward<Args>(args)...);
         }, is_new_style_constructor(), extra...);
     }
 
@@ -182,7 +192,7 @@ struct constructor {
                           !std::is_constructible<Cpp<Class>, Args...>::value, int> = 0>
     static void execute(Class &cl, const Extra&... extra) {
         cl.def("__init__", [](value_and_holder &v_h, Args... args) {
-            v_h.value_ptr() = new Alias<Class>{std::forward<Args>(args)...};
+            v_h.value_ptr() = construct_or_initialize<Alias<Class>>(std::forward<Args>(args)...);
         }, is_new_style_constructor(), extra...);
     }
 };
@@ -193,7 +203,7 @@ template <typename... Args> struct alias_constructor {
               enable_if_t<Class::has_alias && std::is_constructible<Alias<Class>, Args...>::value, int> = 0>
     static void execute(Class &cl, const Extra&... extra) {
         cl.def("__init__", [](value_and_holder &v_h, Args... args) {
-            v_h.value_ptr() = new Alias<Class>{std::forward<Args>(args)...};
+            v_h.value_ptr() = construct_or_initialize<Alias<Class>>(std::forward<Args>(args)...);
         }, is_new_style_constructor(), extra...);
     }
 };

dlib/external/pybind11/include/pybind11/detail/internals.h

@@ -127,21 +127,21 @@ struct type_info {
 
 /// Each module locally stores a pointer to the `internals` data. The data
 /// itself is shared among modules with the same `PYBIND11_INTERNALS_ID`.
-inline internals *&get_internals_ptr() {
-    static internals *internals_ptr = nullptr;
-    return internals_ptr;
+inline internals **&get_internals_pp() {
+    static internals **internals_pp = nullptr;
+    return internals_pp;
 }
 
 /// Return a reference to the current `internals` data
 PYBIND11_NOINLINE inline internals &get_internals() {
-    auto *&internals_ptr = get_internals_ptr();
-    if (internals_ptr)
-        return *internals_ptr;
+    auto **&internals_pp = get_internals_pp();
+    if (internals_pp && *internals_pp)
+        return **internals_pp;
 
     constexpr auto *id = PYBIND11_INTERNALS_ID;
     auto builtins = handle(PyEval_GetBuiltins());
     if (builtins.contains(id) && isinstance<capsule>(builtins[id])) {
-        internals_ptr = *static_cast<internals **>(capsule(builtins[id]));
+        internals_pp = static_cast<internals **>(capsule(builtins[id]));
 
         // We loaded builtins through python's builtins, which means that our `error_already_set`
         // and `builtin_exception` may be different local classes than the ones set up in the
@@ -149,7 +149,7 @@ PYBIND11_NOINLINE inline internals &get_internals() {
         //
         // libstdc++ doesn't require this (types there are identified only by name)
 #if !defined(__GLIBCXX__)
-        internals_ptr->registered_exception_translators.push_front(
+        (*internals_pp)->registered_exception_translators.push_front(
             [](std::exception_ptr p) -> void {
                 try {
                     if (p) std::rethrow_exception(p);
@@ -160,6 +160,8 @@ PYBIND11_NOINLINE inline internals &get_internals() {
         );
 #endif
     } else {
+        if (!internals_pp) internals_pp = new internals*();
+        auto *&internals_ptr = *internals_pp;
         internals_ptr = new internals();
 #if defined(WITH_THREAD)
         PyEval_InitThreads();
@@ -168,7 +170,7 @@ PYBIND11_NOINLINE inline internals &get_internals() {
         PyThread_set_key_value(internals_ptr->tstate, tstate);
         internals_ptr->istate = tstate->interp;
 #endif
-        builtins[id] = capsule(&internals_ptr);
+        builtins[id] = capsule(internals_pp);
         internals_ptr->registered_exception_translators.push_front(
             [](std::exception_ptr p) -> void {
                 try {
@@ -192,7 +194,7 @@ PYBIND11_NOINLINE inline internals &get_internals() {
         internals_ptr->default_metaclass = make_default_metaclass();
         internals_ptr->instance_base = make_object_base_type(internals_ptr->default_metaclass);
     }
-    return *internals_ptr;
+    return **internals_pp;
 }
 
 /// Works like `internals.registered_types_cpp`, but for module-local registered types:

dlib/external/pybind11/include/pybind11/eigen.h

@@ -17,24 +17,20 @@
 #  pragma GCC diagnostic push
 #  pragma GCC diagnostic ignored "-Wconversion"
 #  pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-#  ifdef __clang__
-//   Eigen generates a bunch of implicit-copy-constructor-is-deprecated warnings with -Wdeprecated
-//   under Clang, so disable that warning here:
-#    pragma GCC diagnostic ignored "-Wdeprecated"
-#  endif
 #  if __GNUC__ >= 7
 #    pragma GCC diagnostic ignored "-Wint-in-bool-context"
 #  endif
 #endif
 
-#include <Eigen/Core>
-#include <Eigen/SparseCore>
-
 #if defined(_MSC_VER)
 #  pragma warning(push)
 #  pragma warning(disable: 4127) // warning C4127: Conditional expression is constant
+#  pragma warning(disable: 4996) // warning C4996: std::unary_negate is deprecated in C++17
 #endif
 
+#include <Eigen/Core>
+#include <Eigen/SparseCore>
+
 // Eigen prior to 3.2.7 doesn't have proper move constructors--but worse, some classes get implicit
 // move constructors that break things.  We could detect this an explicitly copy, but an extra copy
 // of matrices seems highly undesirable.
@@ -185,13 +181,13 @@ template <typename Type_> struct EigenProps {
         }
     }
 
-    static constexpr bool show_writeable = is_eigen_dense_map<Type>::value && is_eigen_mutable_map<Type>::value;
-    static constexpr bool show_order = is_eigen_dense_map<Type>::value;
-    static constexpr bool show_c_contiguous = show_order && requires_row_major;
-    static constexpr bool show_f_contiguous = !show_c_contiguous && show_order && requires_col_major;
+    static PYBIND11_DESCR descriptor() {
+        constexpr bool show_writeable = is_eigen_dense_map<Type>::value && is_eigen_mutable_map<Type>::value;
+        constexpr bool show_order = is_eigen_dense_map<Type>::value;
+        constexpr bool show_c_contiguous = show_order && requires_row_major;
+        constexpr bool show_f_contiguous = !show_c_contiguous && show_order && requires_col_major;
 
-    static constexpr auto descriptor =
-        _("numpy.ndarray[") + npy_format_descriptor<Scalar>::name +
+        return type_descr(_("numpy.ndarray[") + npy_format_descriptor<Scalar>::name() +
             _("[")  + _<fixed_rows>(_<(size_t) rows>(), _("m")) +
             _(", ") + _<fixed_cols>(_<(size_t) cols>(), _("n")) +
             _("]") +
@@ -204,7 +200,9 @@ template <typename Type_> struct EigenProps {
             _<show_writeable>(", flags.writeable", "") +
             _<show_c_contiguous>(", flags.c_contiguous", "") +
             _<show_f_contiguous>(", flags.f_contiguous", "") +
-        _("]");
+            _("]")
+        );
+    }
 };
 
 // Casts an Eigen type to numpy array.  If given a base, the numpy array references the src data,
@@ -341,7 +339,7 @@ public:
         return cast_impl(src, policy, parent);
     }
 
-    static constexpr auto name = props::descriptor;
+    static PYBIND11_DESCR name() { return props::descriptor(); }
 
     operator Type*() { return &value; }
     operator Type&() { return value; }
@@ -389,7 +387,7 @@ public:
         }
     }
 
-    static constexpr auto name = props::descriptor;
+    static PYBIND11_DESCR name() { return props::descriptor(); }
 
     // Explicitly delete these: support python -> C++ conversion on these (i.e. these can be return
     // types but not bound arguments).  We still provide them (with an explicitly delete) so that
@@ -534,7 +532,7 @@ public:
     }
     static handle cast(const Type *src, return_value_policy policy, handle parent) { return cast(*src, policy, parent); }
 
-    static constexpr auto name = props::descriptor;
+    static PYBIND11_DESCR name() { return props::descriptor(); }
 
     // Explicitly delete these: support python -> C++ conversion on these (i.e. these can be return
     // types but not bound arguments).  We still provide them (with an explicitly delete) so that
@@ -601,7 +599,7 @@ struct type_caster<Type, enable_if_t<is_eigen_sparse<Type>::value>> {
     }
 
     PYBIND11_TYPE_CASTER(Type, _<(Type::IsRowMajor) != 0>("scipy.sparse.csr_matrix[", "scipy.sparse.csc_matrix[")
-            + npy_format_descriptor<Scalar>::name + _("]"));
+            + npy_format_descriptor<Scalar>::name() + _("]"));
 };
 
 NAMESPACE_END(detail)

dlib/external/pybind11/include/pybind11/embed.h

@@ -145,7 +145,7 @@ inline void finalize_interpreter() {
     // Get the internals pointer (without creating it if it doesn't exist).  It's possible for the
     // internals to be created during Py_Finalize() (e.g. if a py::capsule calls `get_internals()`
     // during destruction), so we get the pointer-pointer here and check it after Py_Finalize().
-    detail::internals **internals_ptr_ptr = &detail::get_internals_ptr();
+    detail::internals **internals_ptr_ptr = detail::get_internals_pp();
     // It could also be stashed in builtins, so look there too:
     if (builtins.contains(id) && isinstance<capsule>(builtins[id]))
         internals_ptr_ptr = capsule(builtins[id]);

dlib/external/pybind11/include/pybind11/functional.h

@@ -75,8 +75,10 @@ public:
             return cpp_function(std::forward<Func>(f_), policy).release();
     }
 
-    PYBIND11_TYPE_CASTER(type, _("Callable[[") + concat(make_caster<Args>::name...) + _("], ")
-                               + make_caster<retval_type>::name + _("]"));
+    PYBIND11_TYPE_CASTER(type, _("Callable[[") +
+            argument_loader<Args...>::arg_names() + _("], ") +
+            make_caster<retval_type>::name() +
+            _("]"));
 };
 
 NAMESPACE_END(detail)

dlib/external/pybind11/include/pybind11/numpy.h

@@ -250,7 +250,7 @@ template <typename T> struct array_info_scalar {
     typedef T type;
     static constexpr bool is_array = false;
     static constexpr bool is_empty = false;
-    static constexpr auto extents = _("");
+    static PYBIND11_DESCR extents() { return _(""); }
     static void append_extents(list& /* shape */) { }
 };
 // Computes underlying type and a comma-separated list of extents for array
@@ -269,9 +269,15 @@ template <typename T, size_t N> struct array_info<std::array<T, N>> {
         array_info<T>::append_extents(shape);
     }
 
-    static constexpr auto extents = _<array_info<T>::is_array>(
-        concat(_<N>(), array_info<T>::extents), _<N>()
-    );
+    template<typename T2 = T, enable_if_t<!array_info<T2>::is_array, int> = 0>
+    static PYBIND11_DESCR extents() {
+        return _<N>();
+    }
+
+    template<typename T2 = T, enable_if_t<array_info<T2>::is_array, int> = 0>
+    static PYBIND11_DESCR extents() {
+        return concat(_<N>(), array_info<T>::extents());
+    }
 };
 // For numpy we have special handling for arrays of characters, so we don't include
 // the size in the array extents.
@@ -440,7 +446,7 @@ public:
     /// This is essentially the same as calling numpy.dtype(args) in Python.
     static dtype from_args(object args) {
         PyObject *ptr = nullptr;
-        if (!detail::npy_api::get().PyArray_DescrConverter_(args.ptr(), &ptr) || !ptr)
+        if (!detail::npy_api::get().PyArray_DescrConverter_(args.release().ptr(), &ptr) || !ptr)
             throw error_already_set();
         return reinterpret_steal<dtype>(ptr);
     }
@@ -940,9 +946,9 @@ struct format_descriptor<T, detail::enable_if_t<std::is_enum<T>::value>> {
 template <typename T>
 struct format_descriptor<T, detail::enable_if_t<detail::array_info<T>::is_array>> {
     static std::string format() {
-        using detail::_;
-        static constexpr auto extents = _("(") + detail::array_info<T>::extents + _(")");
-        return extents.text + format_descriptor<detail::remove_all_extents_t<T>>::format();
+        using namespace detail;
+        PYBIND11_DESCR extents = _("(") + array_info<T>::extents() + _(")");
+        return extents.text() + format_descriptor<remove_all_extents_t<T>>::format();
     }
 };
 
@@ -961,7 +967,7 @@ struct pyobject_caster<array_t<T, ExtraFlags>> {
     static handle cast(const handle &src, return_value_policy /* policy */, handle /* parent */) {
         return src.inc_ref();
     }
-    PYBIND11_TYPE_CASTER(type, handle_type_name<type>::name);
+    PYBIND11_TYPE_CASTER(type, handle_type_name<type>::name());
 };
 
 template <typename T>
@@ -971,34 +977,7 @@ struct compare_buffer_info<T, detail::enable_if_t<detail::is_pod_struct<T>::valu
     }
 };
 
-template <typename T, typename = void>
-struct npy_format_descriptor_name;
-
-template <typename T>
-struct npy_format_descriptor_name<T, enable_if_t<std::is_integral<T>::value>> {
-    static constexpr auto name = _<std::is_same<T, bool>::value>(
-        _("bool"), _<std::is_signed<T>::value>("int", "uint") + _<sizeof(T)*8>()
-    );
-};
-
-template <typename T>
-struct npy_format_descriptor_name<T, enable_if_t<std::is_floating_point<T>::value>> {
-    static constexpr auto name = _<std::is_same<T, float>::value || std::is_same<T, double>::value>(
-        _("float") + _<sizeof(T)*8>(), _("longdouble")
-    );
-};
-
-template <typename T>
-struct npy_format_descriptor_name<T, enable_if_t<is_complex<T>::value>> {
-    static constexpr auto name = _<std::is_same<typename T::value_type, float>::value
-                                   || std::is_same<typename T::value_type, double>::value>(
-        _("complex") + _<sizeof(typename T::value_type)*16>(), _("longcomplex")
-    );
-};
-
-template <typename T>
-struct npy_format_descriptor<T, enable_if_t<satisfies_any_of<T, std::is_arithmetic, is_complex>::value>>
-    : npy_format_descriptor_name<T> {
+template <typename T> struct npy_format_descriptor<T, enable_if_t<satisfies_any_of<T, std::is_arithmetic, is_complex>::value>> {
 private:
     // NB: the order here must match the one in common.h
     constexpr static const int values[15] = {
@@ -1017,10 +996,25 @@ public:
             return reinterpret_borrow<pybind11::dtype>(ptr);
         pybind11_fail("Unsupported buffer format!");
     }
+    template <typename T2 = T, enable_if_t<std::is_integral<T2>::value, int> = 0>
+    static PYBIND11_DESCR name() {
+        return _<std::is_same<T, bool>::value>(_("bool"),
+            _<std::is_signed<T>::value>("int", "uint") + _<sizeof(T)*8>());
+    }
+    template <typename T2 = T, enable_if_t<std::is_floating_point<T2>::value, int> = 0>
+    static PYBIND11_DESCR name() {
+        return _<std::is_same<T, float>::value || std::is_same<T, double>::value>(
+                _("float") + _<sizeof(T)*8>(), _("longdouble"));
+    }
+    template <typename T2 = T, enable_if_t<is_complex<T2>::value, int> = 0>
+    static PYBIND11_DESCR name() {
+        return _<std::is_same<typename T2::value_type, float>::value || std::is_same<typename T2::value_type, double>::value>(
+                _("complex") + _<sizeof(typename T2::value_type)*16>(), _("longcomplex"));
+    }
 };
 
 #define PYBIND11_DECL_CHAR_FMT \
-    static constexpr auto name = _("S") + _<N>(); \
+    static PYBIND11_DESCR name() { return _("S") + _<N>(); } \
     static pybind11::dtype dtype() { return pybind11::dtype(std::string("S") + std::to_string(N)); }
 template <size_t N> struct npy_format_descriptor<char[N]> { PYBIND11_DECL_CHAR_FMT };
 template <size_t N> struct npy_format_descriptor<std::array<char, N>> { PYBIND11_DECL_CHAR_FMT };
@@ -1032,7 +1026,7 @@ private:
 public:
     static_assert(!array_info<T>::is_empty, "Zero-sized arrays are not supported");
 
-    static constexpr auto name = _("(") + array_info<T>::extents + _(")") + base_descr::name;
+    static PYBIND11_DESCR name() { return _("(") + array_info<T>::extents() + _(")") + base_descr::name(); }
     static pybind11::dtype dtype() {
         list shape;
         array_info<T>::append_extents(shape);
@@ -1044,7 +1038,7 @@ template<typename T> struct npy_format_descriptor<T, enable_if_t<std::is_enum<T>
 private:
     using base_descr = npy_format_descriptor<typename std::underlying_type<T>::type>;
 public:
-    static constexpr auto name = base_descr::name;
+    static PYBIND11_DESCR name() { return base_descr::name(); }
     static pybind11::dtype dtype() { return base_descr::dtype(); }
 };
 
@@ -1119,7 +1113,7 @@ inline PYBIND11_NOINLINE void register_structured_dtype(
 template <typename T, typename SFINAE> struct npy_format_descriptor {
     static_assert(is_pod_struct<T>::value, "Attempt to use a non-POD or unimplemented POD type as a numpy dtype");
 
-    static constexpr auto name = make_caster<T>::name;
+    static PYBIND11_DESCR name() { return make_caster<T>::name(); }
 
     static pybind11::dtype dtype() {
         return reinterpret_borrow<pybind11::dtype>(dtype_ptr());
@@ -1564,7 +1558,9 @@ vectorize_extractor(const Func &f, Return (*) (Args ...)) {
 }
 
 template <typename T, int Flags> struct handle_type_name<array_t<T, Flags>> {
-    static constexpr auto name = _("numpy.ndarray[") + npy_format_descriptor<T>::name + _("]");
+    static PYBIND11_DESCR name() {
+        return _("numpy.ndarray[") + npy_format_descriptor<T>::name() + _("]");
+    }
 };
 
 NAMESPACE_END(detail)

dlib/external/pybind11/include/pybind11/pybind11.h

@@ -51,7 +51,6 @@ NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
 class cpp_function : public function {
 public:
     cpp_function() { }
-    cpp_function(std::nullptr_t) { }
 
     /// Construct a cpp_function from a vanilla function pointer
     template <typename Return, typename... Args, typename... Extra>
@@ -94,7 +93,8 @@ protected:
     template <typename Func, typename Return, typename... Args, typename... Extra>
     void initialize(Func &&f, Return (*)(Args...), const Extra&... extra) {
         using namespace detail;
-        struct capture { detail::remove_reference_t<Func> f; };
+
+        struct capture { remove_reference_t<Func> f; };
 
         /* Store the function including any extra state it might have (e.g. a lambda capture object) */
         auto rec = make_function_record();
@@ -113,23 +113,23 @@ protected:
 #  pragma GCC diagnostic pop
 #endif
             if (!std::is_trivially_destructible<Func>::value)
-                rec->free_data = [](detail::function_record *r) { ((capture *) &r->data)->~capture(); };
+                rec->free_data = [](function_record *r) { ((capture *) &r->data)->~capture(); };
         } else {
             rec->data[0] = new capture { std::forward<Func>(f) };
-            rec->free_data = [](detail::function_record *r) { delete ((capture *) r->data[0]); };
+            rec->free_data = [](function_record *r) { delete ((capture *) r->data[0]); };
         }
 
         /* Type casters for the function arguments and return value */
-        using cast_in = detail::argument_loader<Args...>;
-        using cast_out = detail::make_caster<
-            detail::conditional_t<std::is_void<Return>::value, detail::void_type, Return>
+        using cast_in = argument_loader<Args...>;
+        using cast_out = make_caster<
+            conditional_t<std::is_void<Return>::value, void_type, Return>
         >;
 
-        static_assert(detail::expected_num_args<Extra...>(sizeof...(Args), cast_in::has_args, cast_in::has_kwargs),
+        static_assert(expected_num_args<Extra...>(sizeof...(Args), cast_in::has_args, cast_in::has_kwargs),
                       "The number of argument annotations does not match the number of function arguments");
 
         /* Dispatch code which converts function arguments and performs the actual function call */
-        rec->impl = [](detail::function_call &call) -> handle {
+        rec->impl = [](function_call &call) -> handle {
             cast_in args_converter;
 
             /* Try to cast the function arguments into the C++ domain */
@@ -137,7 +137,7 @@ protected:
                 return PYBIND11_TRY_NEXT_OVERLOAD;
 
             /* Invoke call policy pre-call hook */
-            detail::process_attributes<Extra...>::precall(call);
+            process_attributes<Extra...>::precall(call);
 
             /* Get a pointer to the capture object */
             auto data = (sizeof(capture) <= sizeof(call.func.data)
@@ -145,30 +145,29 @@ protected:
             capture *cap = const_cast<capture *>(reinterpret_cast<const capture *>(data));
 
             /* Override policy for rvalues -- usually to enforce rvp::move on an rvalue */
-            const auto policy = detail::return_value_policy_override<Return>::policy(call.func.policy);
+            const auto policy = return_value_policy_override<Return>::policy(call.func.policy);
 
             /* Function scope guard -- defaults to the compile-to-nothing `void_type` */
-            using Guard = detail::extract_guard_t<Extra...>;
+            using Guard = extract_guard_t<Extra...>;
 
             /* Perform the function call */
             handle result = cast_out::cast(
                 std::move(args_converter).template call<Return, Guard>(cap->f), policy, call.parent);
 
             /* Invoke call policy post-call hook */
-            detail::process_attributes<Extra...>::postcall(call, result);
+            process_attributes<Extra...>::postcall(call, result);
 
             return result;
         };
 
         /* Process any user-provided function attributes */
-        detail::process_attributes<Extra...>::init(extra..., rec);
+        process_attributes<Extra...>::init(extra..., rec);
 
         /* Generate a readable signature describing the function's arguments and return value types */
-        static constexpr auto signature = _("(") + cast_in::arg_names + _(") -> ") + cast_out::name;
-        PYBIND11_DESCR_CONSTEXPR auto types = decltype(signature)::types();
+        PYBIND11_DESCR signature = _("(") + cast_in::arg_names() + _(") -> ") + cast_out::name();
 
         /* Register the function with Python from generic (non-templated) code */
-        initialize_generic(rec, signature.text, types.data(), sizeof...(Args));
+        initialize_generic(rec, signature.text(), signature.types(), sizeof...(Args));
 
         if (cast_in::has_args) rec->has_args = true;
         if (cast_in::has_kwargs) rec->has_kwargs = true;
@@ -218,16 +217,16 @@ protected:
 
         /* Generate a proper function signature */
         std::string signature;
-        size_t type_index = 0, arg_index = 0;
-        for (auto *pc = text; *pc != '\0'; ++pc) {
-            const auto c = *pc;
+        size_t type_depth = 0, char_index = 0, type_index = 0, arg_index = 0;
+        while (true) {
+            char c = text[char_index++];
+            if (c == '\0')
+                break;
 
             if (c == '{') {
-                // Write arg name for everything except *args and **kwargs.
-                if (*(pc + 1) == '*')
-                    continue;
-
-                if (arg_index < rec->args.size() && rec->args[arg_index].name) {
+                // Write arg name for everything except *args, **kwargs and return type.
+                if (type_depth == 0 && text[char_index] != '*' && arg_index < args) {
+                    if (!rec->args.empty() && rec->args[arg_index].name) {
                         signature += rec->args[arg_index].name;
                     } else if (arg_index == 0 && rec->is_method) {
                         signature += "self";
@@ -235,13 +234,17 @@ protected:
                         signature += "arg" + std::to_string(arg_index - (rec->is_method ? 1 : 0));
                     }
                     signature += ": ";
+                }
+                ++type_depth;
             } else if (c == '}') {
-                // Write default value if available.
+                --type_depth;
+                if (type_depth == 0) {
                     if (arg_index < rec->args.size() && rec->args[arg_index].descr) {
                         signature += "=";
                         signature += rec->args[arg_index].descr;
                     }
                     arg_index++;
+                }
             } else if (c == '%') {
                 const std::type_info *t = types[type_index++];
                 if (!t)
@@ -266,9 +269,14 @@ protected:
                 signature += c;
             }
         }
-        if (arg_index != args || types[type_index] != nullptr)
+        if (type_depth != 0 || types[type_index] != nullptr)
             pybind11_fail("Internal error while parsing type signature (2)");
 
+        #if !defined(PYBIND11_CONSTEXPR_DESCR)
+            delete[] types;
+            delete[] text;
+        #endif
+
 #if PY_MAJOR_VERSION < 3
         if (strcmp(rec->name, "__next__") == 0) {
             std::free(rec->name);
@@ -568,8 +576,8 @@ protected:
                     continue; // Unconsumed kwargs, but no py::kwargs argument to accept them
 
                 // 4a. If we have a py::args argument, create a new tuple with leftovers
-                tuple extra_args;
                 if (func.has_args) {
+                    tuple extra_args;
                     if (args_to_copy == 0) {
                         // We didn't copy out any position arguments from the args_in tuple, so we
                         // can reuse it directly without copying:
@@ -580,12 +588,12 @@ protected:
                         size_t args_size = n_args_in - args_copied;
                         extra_args = tuple(args_size);
                         for (size_t i = 0; i < args_size; ++i) {
-                            handle item = PyTuple_GET_ITEM(args_in, args_copied + i);
-                            extra_args[i] = item.inc_ref().ptr();
+                            extra_args[i] = PyTuple_GET_ITEM(args_in, args_copied + i);
                         }
                     }
                     call.args.push_back(extra_args);
                     call.args_convert.push_back(false);
+                    call.args_ref = std::move(extra_args);
                 }
 
                 // 4b. If we have a py::kwargs, pass on any remaining kwargs
@@ -594,6 +602,7 @@ protected:
                         kwargs = dict(); // If we didn't get one, send an empty one
                     call.args.push_back(kwargs);
                     call.args_convert.push_back(false);
+                    call.kwargs_ref = std::move(kwargs);
                 }
 
                 // 5. Put everything in a vector.  Not technically step 5, we've been building it
@@ -952,18 +961,18 @@ protected:
         tinfo->get_buffer_data = get_buffer_data;
     }
 
-    // rec_func must be set for either fget or fset.
     void def_property_static_impl(const char *name,
                                   handle fget, handle fset,
-                                  detail::function_record *rec_func) {
-        const auto is_static = rec_func && !(rec_func->is_method && rec_func->scope);
-        const auto has_doc = rec_func && rec_func->doc && pybind11::options::show_user_defined_docstrings();
+                                  detail::function_record *rec_fget) {
+        const auto is_static = !(rec_fget->is_method && rec_fget->scope);
+        const auto has_doc = rec_fget->doc && pybind11::options::show_user_defined_docstrings();
+
         auto property = handle((PyObject *) (is_static ? get_internals().static_property_type
                                                        : &PyProperty_Type));
         attr(name) = property(fget.ptr() ? fget : none(),
                               fset.ptr() ? fset : none(),
                               /*deleter*/none(),
-                              pybind11::str(has_doc ? rec_func->doc : ""));
+                              pybind11::str(has_doc ? rec_fget->doc : ""));
     }
 };
 
@@ -995,18 +1004,10 @@ template <typename /*Derived*/, typename F>
 auto method_adaptor(F &&f) -> decltype(std::forward<F>(f)) { return std::forward<F>(f); }
 
 template <typename Derived, typename Return, typename Class, typename... Args>
-auto method_adaptor(Return (Class::*pmf)(Args...)) -> Return (Derived::*)(Args...) {
-    static_assert(detail::is_accessible_base_of<Class, Derived>::value,
-        "Cannot bind an inaccessible base class method; use a lambda definition instead");
-    return pmf;
-}
+auto method_adaptor(Return (Class::*pmf)(Args...)) -> Return (Derived::*)(Args...) { return pmf; }
 
 template <typename Derived, typename Return, typename Class, typename... Args>
-auto method_adaptor(Return (Class::*pmf)(Args...) const) -> Return (Derived::*)(Args...) const {
-    static_assert(detail::is_accessible_base_of<Class, Derived>::value,
-        "Cannot bind an inaccessible base class method; use a lambda definition instead");
-    return pmf;
-}
+auto method_adaptor(Return (Class::*pmf)(Args...) const) -> Return (Derived::*)(Args...) const { return pmf; }
 
 template <typename type_, typename... options>
 class class_ : public detail::generic_type {
@@ -1197,7 +1198,7 @@ public:
     /// Uses cpp_function's return_value_policy by default
     template <typename... Extra>
     class_ &def_property_readonly(const char *name, const cpp_function &fget, const Extra& ...extra) {
-        return def_property(name, fget, nullptr, extra...);
+        return def_property(name, fget, cpp_function(), extra...);
     }
 
     /// Uses return_value_policy::reference by default
@@ -1209,7 +1210,7 @@ public:
     /// Uses cpp_function's return_value_policy by default
     template <typename... Extra>
     class_ &def_property_readonly_static(const char *name, const cpp_function &fget, const Extra& ...extra) {
-        return def_property_static(name, fget, nullptr, extra...);
+        return def_property_static(name, fget, cpp_function(), extra...);
     }
 
     /// Uses return_value_policy::reference_internal by default
@@ -1239,25 +1240,21 @@ public:
     template <typename... Extra>
     class_ &def_property_static(const char *name, const cpp_function &fget, const cpp_function &fset, const Extra& ...extra) {
         auto rec_fget = get_function_record(fget), rec_fset = get_function_record(fset);
-        auto *rec_active = rec_fget;
-        if (rec_fget) {
         char *doc_prev = rec_fget->doc; /* 'extra' field may include a property-specific documentation string */
         detail::process_attributes<Extra...>::init(extra..., rec_fget);
         if (rec_fget->doc && rec_fget->doc != doc_prev) {
             free(doc_prev);
             rec_fget->doc = strdup(rec_fget->doc);
         }
-        }
         if (rec_fset) {
-            char *doc_prev = rec_fset->doc;
+            doc_prev = rec_fset->doc;
             detail::process_attributes<Extra...>::init(extra..., rec_fset);
             if (rec_fset->doc && rec_fset->doc != doc_prev) {
                 free(doc_prev);
                 rec_fset->doc = strdup(rec_fset->doc);
             }
-            if (! rec_active) rec_active = rec_fset;
         }
-        def_property_static_impl(name, fget, fset, rec_active);
+        def_property_static_impl(name, fget, fset, rec_fget);
         return *this;
     }
 
@@ -1375,30 +1372,15 @@ public:
         auto m_entries_ptr = m_entries.inc_ref().ptr();
         def("__repr__", [name, m_entries_ptr](Type value) -> pybind11::str {
             for (const auto &kv : reinterpret_borrow<dict>(m_entries_ptr)) {
-                if (pybind11::cast<Type>(kv.second[int_(0)]) == value)
+                if (pybind11::cast<Type>(kv.second) == value)
                     return pybind11::str("{}.{}").format(name, kv.first);
             }
             return pybind11::str("{}.???").format(name);
         });
-        def_property_readonly_static("__doc__", [m_entries_ptr](handle self) {
-            std::string docstring;
-            const char *tp_doc = ((PyTypeObject *) self.ptr())->tp_doc;
-            if (tp_doc)
-                docstring += std::string(tp_doc) + "\n\n";
-            docstring += "Members:";
-            for (const auto &kv : reinterpret_borrow<dict>(m_entries_ptr)) {
-                auto key = std::string(pybind11::str(kv.first));
-                auto comment = kv.second[int_(1)];
-                docstring += "\n\n  " + key;
-                if (!comment.is_none())
-                    docstring += " : " + (std::string) pybind11::str(comment);
-            }
-            return docstring;
-        });
-        def_property_readonly_static("__members__", [m_entries_ptr](handle /* self */) {
+        def_property_readonly_static("__members__", [m_entries_ptr](object /* self */) {
             dict m;
             for (const auto &kv : reinterpret_borrow<dict>(m_entries_ptr))
-                m[kv.first] = kv.second[int_(0)];
+                m[kv.first] = kv.second;
             return m;
         }, return_value_policy::copy);
         def(init([](Scalar i) { return static_cast<Type>(i); }));
@@ -1446,15 +1428,15 @@ public:
     /// Export enumeration entries into the parent scope
     enum_& export_values() {
         for (const auto &kv : m_entries)
-            m_parent.attr(kv.first) = kv.second[int_(0)];
+            m_parent.attr(kv.first) = kv.second;
         return *this;
     }
 
     /// Add an enumeration entry
-    enum_& value(char const* name, Type value, const char *doc = nullptr) {
+    enum_& value(char const* name, Type value) {
         auto v = pybind11::cast(value, return_value_policy::copy);
         this->attr(name) = v;
-        m_entries[pybind11::str(name)] = std::make_pair(v, doc);
+        m_entries[pybind11::str(name)] = v;
         return *this;
     }
 

dlib/external/pybind11/include/pybind11/pytypes.h

@@ -295,9 +295,6 @@ public:
         PyErr_Fetch(&type.ptr(), &value.ptr(), &trace.ptr());
     }
 
-    error_already_set(const error_already_set &) = default;
-    error_already_set(error_already_set &&) = default;
-
     inline ~error_already_set();
 
     /// Give the currently-held error back to Python, if any.  If there is currently a Python error

dlib/external/pybind11/include/pybind11/stl.h

@@ -30,7 +30,8 @@
 #    define PYBIND11_HAS_OPTIONAL 1
 #  endif
 // std::experimental::optional (but not allowed in c++11 mode)
-#  if defined(PYBIND11_CPP14) && __has_include(<experimental/optional>)
+#  if defined(PYBIND11_CPP14) && (__has_include(<experimental/optional>) && \
+                                 !__has_include(<optional>))
 #    include <experimental/optional>
 #    define PYBIND11_HAS_EXP_OPTIONAL 1
 #  endif
@@ -91,7 +92,7 @@ template <typename Type, typename Key> struct set_caster {
         return s.release();
     }
 
-    PYBIND11_TYPE_CASTER(type, _("Set[") + key_conv::name + _("]"));
+    PYBIND11_TYPE_CASTER(type, _("Set[") + key_conv::name() + _("]"));
 };
 
 template <typename Type, typename Key, typename Value> struct map_caster {
@@ -127,7 +128,7 @@ template <typename Type, typename Key, typename Value> struct map_caster {
         return d.release();
     }
 
-    PYBIND11_TYPE_CASTER(Type, _("Dict[") + key_conv::name + _(", ") + value_conv::name + _("]"));
+    PYBIND11_TYPE_CASTER(Type, _("Dict[") + key_conv::name() + _(", ") + value_conv::name() + _("]"));
 };
 
 template <typename Type, typename Value> struct list_caster {
@@ -168,7 +169,7 @@ public:
         return l.release();
     }
 
-    PYBIND11_TYPE_CASTER(Type, _("List[") + value_conv::name + _("]"));
+    PYBIND11_TYPE_CASTER(Type, _("List[") + value_conv::name() + _("]"));
 };
 
 template <typename Type, typename Alloc> struct type_caster<std::vector<Type, Alloc>>
@@ -222,7 +223,7 @@ public:
         return l.release();
     }
 
-    PYBIND11_TYPE_CASTER(ArrayType, _("List[") + value_conv::name + _<Resizable>(_(""), _("[") + _<Size>() + _("]")) + _("]"));
+    PYBIND11_TYPE_CASTER(ArrayType, _("List[") + value_conv::name() + _<Resizable>(_(""), _("[") + _<Size>() + _("]")) + _("]"));
 };
 
 template <typename Type, size_t Size> struct type_caster<std::array<Type, Size>>
@@ -268,7 +269,7 @@ template<typename T> struct optional_caster {
         return true;
     }
 
-    PYBIND11_TYPE_CASTER(T, _("Optional[") + value_conv::name + _("]"));
+    PYBIND11_TYPE_CASTER(T, _("Optional[") + value_conv::name() + _("]"));
 };
 
 #if PYBIND11_HAS_OPTIONAL
@@ -348,7 +349,7 @@ struct variant_caster<V<Ts...>> {
     }
 
     using Type = V<Ts...>;
-    PYBIND11_TYPE_CASTER(Type, _("Union[") + detail::concat(make_caster<Ts>::name...) + _("]"));
+    PYBIND11_TYPE_CASTER(Type, _("Union[") + detail::concat(make_caster<Ts>::name()...) + _("]"));
 };
 
 #if PYBIND11_HAS_VARIANT

dlib/external/pybind11/include/pybind11/stl_bind.h

@@ -587,7 +587,7 @@ class_<Map, holder_type> bind_map(handle scope, const std::string &name, Args&&.
                auto it = m.find(k);
                if (it == m.end())
                    throw key_error();
-               return m.erase(it);
+               m.erase(it);
            }
     );
 

dlib/external/pybind11/tools/FindPythonLibsNew.cmake

 # - Find python libraries
-# This module finds the libraries corresponding to the Python interpeter
+# This module finds the libraries corresponding to the Python interpreter
 # FindPythonInterp provides.
 # This code sets the following variables:
 #