Added some typedefs for signed fixed width integers.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403164

dlib/uintn.h

@@ -14,23 +14,35 @@ namespace dlib
         uint32 is a typedef for an unsigned integer that is exactly 32 bits wide.
         uint16 is a typedef for an unsigned integer that is exactly 16 bits wide.
         uint8  is a typedef for an unsigned integer that is exactly 8  bits wide.
+
+        int64 is a typedef for an integer that is exactly 64 bits wide.
+        int32 is a typedef for an integer that is exactly 32 bits wide.
+        int16 is a typedef for an integer that is exactly 16 bits wide.
+        int8  is a typedef for an integer that is exactly 8  bits wide.
     !*/
 
 
 #ifdef __GNUC__
     typedef unsigned long long uint64;
+    typedef long long int64;
 #elif __BORLANDC__
     typedef unsigned __int64 uint64;
+    typedef __int64 int64;
 #elif _MSC_VER
     typedef unsigned __int64 uint64;
+    typedef __int64 int64;
 #else
     typedef unsigned long long uint64;
+    typedef long long int64;
 #endif
 
     typedef unsigned short uint16;
     typedef unsigned int   uint32;
     typedef unsigned char  uint8;
 
+    typedef short int16;
+    typedef int   int32;
+    typedef char  int8;
 
 
     // make sure these types have the right sizes on this platform
@@ -39,6 +51,11 @@ namespace dlib
     COMPILE_TIME_ASSERT(sizeof(uint32) == 4);
     COMPILE_TIME_ASSERT(sizeof(uint64) == 8);
 
+    COMPILE_TIME_ASSERT(sizeof(int8)  == 1);
+    COMPILE_TIME_ASSERT(sizeof(int16) == 2);
+    COMPILE_TIME_ASSERT(sizeof(int32) == 4);
+    COMPILE_TIME_ASSERT(sizeof(int64) == 8);
+
 
 
     template <typename T, size_t s = sizeof(T)>