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// Copyright (C) 2005 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_MEMBER_FUNCTION_POINTER_KERNEl_1_
#define DLIB_MEMBER_FUNCTION_POINTER_KERNEl_1_
#include "../algs.h"
#include "member_function_pointer_kernel_abstract.h"
#include "../enable_if.h"
#include <new>
namespace dlib
{
// ----------------------------------------------------------------------------------------
template <
typename PARAM1 = void,
typename PARAM2 = void,
typename PARAM3 = void,
typename PARAM4 = void
>
class member_function_pointer;
// ----------------------------------------------------------------------------------------
#define DLIB_MFP_SC DLIB_ASSERT(cb != 0, \
"\tvoid member_function_pointer::set" \
<< "\n\tthe member function pointer can't be null" \
<< "\n\tthis: " << this );
#define DLIB_MFP_OC DLIB_ASSERT(this->is_set() == true , \
"\tvoid member_function_pointer::operator()" \
<< "\n\tYou must call set() before you can use this function" \
<< "\n\tthis: " << this);
// ----------------------------------------------------------------------------------------
template <unsigned long num_args>
class mfp_kernel_1_base_class
{
/*
All member function pointer classes inherit from this class. This
is where most of the things in a member function pointer are defined.
The reason for the num_args template argument to this class is to prevent
any sort of implicit casting between derived member function pointer classes
that take different numbers of arguments.
*/
protected:
enum mfp_type { mfp_nonconst, mfp_const, mfp_null};
class mp_base_base
{
public:
mp_base_base(void* ptr, mfp_type type_) : o(ptr),type(type_) {}
virtual ~mp_base_base(){}
virtual void clone(void* ptr) const = 0;
virtual bool is_same (const mp_base_base* item) const = 0;
bool is_set () const { return o!=0; }
void* const o;
const mfp_type type;
};
template <typename T>
class mp_null : public mp_base_base
{
public:
typedef void (T::*mfp_pointer_type)() ;
mp_null (void* , mfp_pointer_type ) : mp_base_base(0,mfp_null), callback(0) {}
mp_null () : mp_base_base(0,mfp_null), callback(0) {}
const mfp_pointer_type callback;
};
template <typename mp_impl>
class mp_impl_T : public mp_impl
{
/*
This class supplies the implementations clone() and is_same() for any
classes that inherit from mp_base_base. It does this in a very
roundabout way...
*/
public:
typedef typename mp_impl::mfp_pointer_type mfp_pointer_type;
mp_impl_T() : mp_impl(0,0) {}
mp_impl_T(void* ptr, mfp_pointer_type cb) : mp_impl(ptr,cb) {}
template <unsigned long mem_size>
void safe_clone(stack_based_memory_block<mem_size>& buf)
{
// This is here just to validate the assumption that our block of memory we have made
// in mp_memory is the right size to store the data for this object. If you
// get a compiler error on this line then email me :)
COMPILE_TIME_ASSERT(sizeof(mp_impl_T) <= mem_size);
clone(buf.get());
}
void clone (void* ptr) const { new(ptr) mp_impl_T(this->o,this->callback); }
bool is_same (const mp_base_base* item) const
{
if (item->o == 0 && this->o == 0)
{
return true;
}
else if (item->o == this->o && this->type == item->type)
{
const mp_impl* i = reinterpret_cast<const mp_impl*>(item);
return (i->callback == this->callback);
}
return false;
}
};
struct dummy_base { virtual void nonnull() {}; virtual ~dummy_base(){}; int a; };
struct dummy : virtual public dummy_base{ void nonnull() {}; };
typedef mp_impl_T<mp_null<dummy> > mp_null_impl;
public:
mfp_kernel_1_base_class (
const mfp_kernel_1_base_class& item
) { item.mp()->clone(mp_memory.get()); }
mfp_kernel_1_base_class (
) { mp_null_impl().safe_clone(mp_memory); }
bool operator == (
const mfp_kernel_1_base_class& item
) const { return mp()->is_same(item.mp()); }
bool operator != (
const mfp_kernel_1_base_class& item
) const { return !(*this == item); }
mfp_kernel_1_base_class& operator= (
const mfp_kernel_1_base_class& item
) { mfp_kernel_1_base_class(item).swap(*this); return *this; }
~mfp_kernel_1_base_class (
) { destroy_mp_memory(); }
void clear(
) { mfp_kernel_1_base_class().swap(*this); }
bool is_set (
) const { return mp()->is_set(); }
private:
typedef void (dummy::*safe_bool)();
public:
operator safe_bool () const { return is_set() ? &dummy::nonnull : 0; }
bool operator!() const { return !is_set(); }
void swap (
mfp_kernel_1_base_class& item
)
{
// make a temp copy of item
mfp_kernel_1_base_class temp(item);
// destory the stuff in item
item.destroy_mp_memory();
// copy *this into item
mp()->clone(item.mp_memory.get());
// destory the stuff in this
destroy_mp_memory();
// copy temp into *this
temp.mp()->clone(mp_memory.get());
}
protected:
// The reason for adding 1 here is because visual studio 2003 will sometimes
// try to compile this code with sizeof(mp_null_impl) == 0 (which is a bug in visual studio).
// Fortunately, no actual real instances of this template seem to end up with that screwed up
// value so everything works fine if we just add 1 so that this degenerate case doesn't cause
// trouble. Note that we know it all works fine because safe_clone() checks the size of this
// memory block whenever the member function pointer is used.
stack_based_memory_block<sizeof(mp_null_impl)+1> mp_memory;
void destroy_mp_memory (
)
{
// Honestly this probably doesn't even do anything but I'm putting
// it here just for good measure.
mp()->~mp_base_base();
}
mp_base_base* mp () { return static_cast<mp_base_base*>(mp_memory.get()); }
const mp_base_base* mp () const { return static_cast<const mp_base_base*>(mp_memory.get()); }
};
// ----------------------------------------------------------------------------------------
template <>
class member_function_pointer<void,void,void,void> : public mfp_kernel_1_base_class<0>
{
class mp_base : public mp_base_base {
public:
mp_base(void* ptr, mfp_type type_) : mp_base_base(ptr,type_) {}
virtual void call() const = 0;
};
template <typename T>
class mp_impl : public mp_base {
public:
typedef void (T::*mfp_pointer_type)() ;
void call () const { (static_cast<T*>(this->o)->*callback)(); }
mp_impl ( void* object, mfp_pointer_type cb) : mp_base(object, mfp_nonconst), callback(cb) {}
const mfp_pointer_type callback;
};
template <typename T>
class mp_impl_const : public mp_base {
public:
typedef void ((T::*mfp_pointer_type)()const);
void call () const { (static_cast<const T*>(this->o)->*callback)(); }
mp_impl_const ( void* object, mfp_pointer_type cb) : mp_base(object,mfp_const), callback(cb) {}
const mfp_pointer_type callback;
};
public:
typedef void param1_type;
typedef void param2_type;
typedef void param3_type;
typedef void param4_type;
// These two typedefs are here for backwards compatibility with previous versions
// of dlib.
typedef member_function_pointer kernel_1a;
typedef member_function_pointer kernel_1a_c;
void operator() () const { DLIB_MFP_OC; static_cast<const mp_base*>(mp_memory.get())->call(); }
// the reason for putting disable_if on this function is that it avoids an overload
// resolution bug in visual studio.
template <typename T> typename disable_if<is_const_type<T>,void>::type
set(T& object, typename mp_impl<T>::mfp_pointer_type cb)
{ DLIB_MFP_SC; destroy_mp_memory(); mp_impl_T<mp_impl<T> >(&object,cb).safe_clone(mp_memory); }
template <typename T> void set(const T& object, typename mp_impl_const<T>::mfp_pointer_type cb)
{ DLIB_MFP_SC; destroy_mp_memory(); mp_impl_T<mp_impl_const<T> >((void*)&object,cb).safe_clone(mp_memory); }
};
// ----------------------------------------------------------------------------------------
template <
typename PARAM1
>
class member_function_pointer<PARAM1,void,void,void> : public mfp_kernel_1_base_class<1>
{
class mp_base : public mp_base_base {
public:
mp_base(void* ptr, mfp_type type_) : mp_base_base(ptr,type_) {}
virtual void call(PARAM1) const = 0;
};
template <typename T>
class mp_impl : public mp_base {
public:
typedef void (T::*mfp_pointer_type)(PARAM1) ;
void call (PARAM1 p1) const { (static_cast<T*>(this->o)->*callback)(p1); }
mp_impl ( void* object, mfp_pointer_type cb) : mp_base(object, mfp_nonconst), callback(cb) {}
const mfp_pointer_type callback;
};
template <typename T>
class mp_impl_const : public mp_base {
public:
typedef void ((T::*mfp_pointer_type)(PARAM1)const);
void call (PARAM1 p1) const { (static_cast<const T*>(this->o)->*callback)(p1); }
mp_impl_const ( void* object, mfp_pointer_type cb) : mp_base(object,mfp_const), callback(cb) {}
const mfp_pointer_type callback;
};
public:
typedef PARAM1 param1_type;
typedef void param2_type;
typedef void param3_type;
typedef void param4_type;
// These two typedefs are here for backwards compatibility with previous versions
// of dlib.
typedef member_function_pointer kernel_1a;
typedef member_function_pointer kernel_1a_c;
void operator() (PARAM1 p1) const { DLIB_MFP_OC; static_cast<const mp_base*>(mp_memory.get())->call(p1); }
// the reason for putting disable_if on this function is that it avoids an overload
// resolution bug in visual studio.
template <typename T> typename disable_if<is_const_type<T>,void>::type
set(T& object, typename mp_impl<T>::mfp_pointer_type cb)
{ DLIB_MFP_SC; destroy_mp_memory(); mp_impl_T<mp_impl<T> >(&object,cb).safe_clone(mp_memory); }
template <typename T> void set(const T& object, typename mp_impl_const<T>::mfp_pointer_type cb)
{ DLIB_MFP_SC; destroy_mp_memory(); mp_impl_T<mp_impl_const<T> >((void*)&object,cb).safe_clone(mp_memory); }
};
// ----------------------------------------------------------------------------------------
template <
typename PARAM1,
typename PARAM2
>
class member_function_pointer<PARAM1,PARAM2,void,void> : public mfp_kernel_1_base_class<2>
{
class mp_base : public mp_base_base {
public:
mp_base(void* ptr, mfp_type type_) : mp_base_base(ptr,type_) {}
virtual void call(PARAM1,PARAM2) const = 0;
};
template <typename T>
class mp_impl : public mp_base {
public:
typedef void (T::*mfp_pointer_type)(PARAM1,PARAM2) ;
void call (PARAM1 p1, PARAM2 p2) const { (static_cast<T*>(this->o)->*callback)(p1,p2); }
mp_impl ( void* object, mfp_pointer_type cb) : mp_base(object, mfp_nonconst), callback(cb) {}
const mfp_pointer_type callback;
};
template <typename T>
class mp_impl_const : public mp_base {
public:
typedef void ((T::*mfp_pointer_type)(PARAM1,PARAM2)const);
void call (PARAM1 p1, PARAM2 p2) const { (static_cast<const T*>(this->o)->*callback)(p1,p2); }
mp_impl_const ( void* object, mfp_pointer_type cb) : mp_base(object,mfp_const), callback(cb) {}
const mfp_pointer_type callback;
};
public:
typedef PARAM1 param1_type;
typedef PARAM2 param2_type;
typedef void param3_type;
typedef void param4_type;
// These two typedefs are here for backwards compatibility with previous versions
// of dlib.
typedef member_function_pointer kernel_1a;
typedef member_function_pointer kernel_1a_c;
void operator() (PARAM1 p1, PARAM2 p2) const { DLIB_MFP_OC; static_cast<const mp_base*>(mp_memory.get())->call(p1,p2); }
// the reason for putting disable_if on this function is that it avoids an overload
// resolution bug in visual studio.
template <typename T> typename disable_if<is_const_type<T>,void>::type
set(T& object, typename mp_impl<T>::mfp_pointer_type cb)
{ DLIB_MFP_SC; destroy_mp_memory(); mp_impl_T<mp_impl<T> >(&object,cb).safe_clone(mp_memory); }
template <typename T> void set(const T& object, typename mp_impl_const<T>::mfp_pointer_type cb)
{ DLIB_MFP_SC; destroy_mp_memory(); mp_impl_T<mp_impl_const<T> >((void*)&object,cb).safe_clone(mp_memory); }
};
// ----------------------------------------------------------------------------------------
template <
typename PARAM1,
typename PARAM2,
typename PARAM3
>
class member_function_pointer<PARAM1,PARAM2,PARAM3,void> : public mfp_kernel_1_base_class<3>
{
class mp_base : public mp_base_base {
public:
mp_base(void* ptr, mfp_type type_) : mp_base_base(ptr,type_) {}
virtual void call(PARAM1,PARAM2,PARAM3) const = 0;
};
template <typename T>
class mp_impl : public mp_base {
public:
typedef void (T::*mfp_pointer_type)(PARAM1,PARAM2,PARAM3) ;
void call (PARAM1 p1, PARAM2 p2, PARAM3 p3) const { (static_cast<T*>(this->o)->*callback)(p1,p2,p3); }
mp_impl ( void* object, mfp_pointer_type cb) : mp_base(object, mfp_nonconst), callback(cb) {}
const mfp_pointer_type callback;
};
template <typename T>
class mp_impl_const : public mp_base {
public:
typedef void ((T::*mfp_pointer_type)(PARAM1,PARAM2,PARAM3)const);
void call (PARAM1 p1, PARAM2 p2, PARAM3 p3) const { (static_cast<const T*>(this->o)->*callback)(p1,p2,p3); }
mp_impl_const ( void* object, mfp_pointer_type cb) : mp_base(object,mfp_const), callback(cb) {}
const mfp_pointer_type callback;
};
public:
typedef PARAM1 param1_type;
typedef PARAM2 param2_type;
typedef PARAM3 param3_type;
typedef void param4_type;
// These two typedefs are here for backwards compatibility with previous versions
// of dlib.
typedef member_function_pointer kernel_1a;
typedef member_function_pointer kernel_1a_c;
void operator() (PARAM1 p1, PARAM2 p2, PARAM3 p3) const { DLIB_MFP_OC; static_cast<const mp_base*>(mp_memory.get())->call(p1,p2,p3); }
// the reason for putting disable_if on this function is that it avoids an overload
// resolution bug in visual studio.
template <typename T> typename disable_if<is_const_type<T>,void>::type
set(T& object, typename mp_impl<T>::mfp_pointer_type cb)
{ DLIB_MFP_SC; destroy_mp_memory(); mp_impl_T<mp_impl<T> >(&object,cb).safe_clone(mp_memory); }
template <typename T> void set(const T& object, typename mp_impl_const<T>::mfp_pointer_type cb)
{ DLIB_MFP_SC; destroy_mp_memory(); mp_impl_T<mp_impl_const<T> >((void*)&object,cb).safe_clone(mp_memory); }
};
// ----------------------------------------------------------------------------------------
template <
typename PARAM1,
typename PARAM2,
typename PARAM3,
typename PARAM4
>
class member_function_pointer : public mfp_kernel_1_base_class<4>
{
class mp_base : public mp_base_base {
public:
mp_base(void* ptr, mfp_type type_) : mp_base_base(ptr,type_) {}
virtual void call(PARAM1,PARAM2,PARAM3,PARAM4) const = 0;
};
template <typename T>
class mp_impl : public mp_base {
public:
typedef void (T::*mfp_pointer_type)(PARAM1,PARAM2,PARAM3, PARAM4) ;
void call (PARAM1 p1, PARAM2 p2, PARAM3 p3, PARAM4 p4) const { (static_cast<T*>(this->o)->*callback)(p1,p2,p3,p4); }
mp_impl ( void* object, mfp_pointer_type cb) : mp_base(object, mfp_nonconst), callback(cb) {}
const mfp_pointer_type callback;
};
template <typename T>
class mp_impl_const : public mp_base {
public:
typedef void ((T::*mfp_pointer_type)(PARAM1,PARAM2,PARAM3,PARAM4)const);
void call (PARAM1 p1, PARAM2 p2, PARAM3 p3, PARAM4 p4) const { (static_cast<const T*>(this->o)->*callback)(p1,p2,p3,p4); }
mp_impl_const ( void* object, mfp_pointer_type cb) : mp_base(object,mfp_const), callback(cb) {}
const mfp_pointer_type callback;
};
public:
typedef PARAM1 param1_type;
typedef PARAM2 param2_type;
typedef PARAM3 param3_type;
typedef PARAM4 param4_type;
// These two typedefs are here for backwards compatibility with previous versions
// of dlib.
typedef member_function_pointer kernel_1a;
typedef member_function_pointer kernel_1a_c;
void operator() (PARAM1 p1, PARAM2 p2, PARAM3 p3, PARAM4 p4) const
{ DLIB_MFP_OC; static_cast<const mp_base*>(mp_memory.get())->call(p1,p2,p3,p4); }
// the reason for putting disable_if on this function is that it avoids an overload
// resolution bug in visual studio.
template <typename T> typename disable_if<is_const_type<T>,void>::type
set(T& object, typename mp_impl<T>::mfp_pointer_type cb)
{ DLIB_MFP_SC; destroy_mp_memory(); mp_impl_T<mp_impl<T> >(&object,cb).safe_clone(mp_memory); }
template <typename T> void set(const T& object, typename mp_impl_const<T>::mfp_pointer_type cb)
{ DLIB_MFP_SC; destroy_mp_memory(); mp_impl_T<mp_impl_const<T> >((void*)&object,cb).safe_clone(mp_memory); }
};
// ----------------------------------------------------------------------------------------
}
#endif // DLIB_MEMBER_FUNCTION_POINTER_KERNEl_1_