Many more API functions (#119)

#83, #95, #100, #101, #102, #103, #104, #110

include/box2d/api.h

@@ -6,23 +6,46 @@
 #include <stdint.h>
 
 #if defined(_WIN32) && defined(box2d_EXPORTS)
-	// building the Box2D DLL
+	// build the Windows DLL
 	#define BOX2D_EXPORT __declspec(dllexport)
 #elif defined(_WIN32) && defined(BOX2D_DLL)
-	// using the Box2D DLL
+	// using the Windows DLL
 	#define BOX2D_EXPORT __declspec(dllimport)
-#elif defined(__GNUC__) && defined(box2d_EXPORTS)
-	// building the Box2D shared library
+#elif defined(box2d_EXPORTS)
+	// building or using the Box2D shared library
 	#define BOX2D_EXPORT __attribute__((visibility("default")))
 #else
 	// static library
 	#define BOX2D_EXPORT
 #endif
 
+#if defined(BOX2D_IMPLEMENTATION)
+	#pragma message("BOX2D_IMPLEMENTATION")
+	#if defined(_WIN32) && defined(box2d_EXPORTS)
+		// build the Windows DLL
+		#define BOX2D_INLINE __declspec(dllexport) extern inline
+	#elif defined(_WIN32) && defined(BOX2D_DLL)
+		// using the Windows DLL
+		#define BOX2D_INLINE __declspec(dllimport)
+	#elif defined(box2d_EXPORTS)
+		#define BOX2D_INLINE __attribute__((visibility("default")))
+	#else
+		#define BOX2D_INLINE extern inline
+	#endif
+#else
+	// #pragma message("BOX2D inline")
+	#define BOX2D_INLINE inline
+#endif
+
 #ifdef __cplusplus
 	#define B2_API extern "C" BOX2D_EXPORT
+	#define B2_INLINE extern "C" BOX2D_INLINE
+	#define B2_LITERAL(T) T
 #else
 	#define B2_API BOX2D_EXPORT
+	#define B2_INLINE BOX2D_INLINE
+	/// Used for C literals like (b2Vec2){1.0f, 2.0f} where C++ requires b2Vec2{1.0f, 2.0f}
+	#define B2_LITERAL(T) (T)
 #endif
 
 /// Prototype for user allocation function.
@@ -34,16 +57,16 @@ typedef void* b2AllocFcn(uint32_t size, int32_t alignment);
 ///	@param mem the memory previously allocated through `b2AllocFcn`
 typedef void b2FreeFcn(void* mem);
 
+/// Prototype for the user assert callback. Return 0 to skip the debugger break.
+typedef int b2AssertFcn(const char* condition, const char* fileName, int lineNumber);
+
 /// This allows the user to override the allocation functions. These should be
 ///	set during application startup.
 B2_API void b2SetAllocator(b2AllocFcn* allocFcn, b2FreeFcn* freeFcn);
 
 /// Total bytes allocated by Box2D
 B2_API uint32_t b2GetByteCount(void);
 
-/// Prototype for the user assert callback. Return 0 to skip the debugger break.
-typedef int b2AssertFcn(const char* condition, const char* fileName, int lineNumber);
-
 /// Override the default assert callback.
 ///	@param assertFcn a non-null assert callback
 B2_API void b2SetAssertFcn(b2AssertFcn* assertFcn);