Reintroduce C++ support and add usage tests for C++ (#4)

Reviewed-on: #4
Co-authored-by: Abdelrahman <said.abdelrahman89@gmail.com>
Co-committed-by: Abdelrahman <said.abdelrahman89@gmail.com>

src/core/mem/arena/mem_arena.h

@@ -8,6 +8,10 @@
 #include "../../os/mem/mem_os.h"
 #include <stdbool.h>
 
+#ifdef WAPP_PLATFORM_CPP
+BEGIN_C_LINKAGE
+#endif // !WAPP_PLATFORM_CPP
+
 typedef struct arena Arena;
 
 #define wapp_mem_arena_init(arena_dptr, base_capacity)                         \
@@ -32,4 +36,8 @@ void *wapp_mem_arena_realloc_aligned(Arena *arena, void *ptr, u64 old_size, u64
 void wapp_mem_arena_clear(Arena *arena);
 void wapp_mem_arena_destroy(Arena **arena);
 
+#ifdef WAPP_PLATFORM_CPP
+END_C_LINKAGE
+#endif // !WAPP_PLATFORM_CPP
+
 #endif // !MEM_ARENA_H

src/core/mem/arena/mem_arena_allocator.h

@@ -9,6 +9,10 @@
 #include "../../os/mem/mem_os.h"
 #include <stdbool.h>
 
+#ifdef WAPP_PLATFORM_CPP
+BEGIN_C_LINKAGE
+#endif // !WAPP_PLATFORM_CPP
+
 #define wapp_mem_arena_allocator_init(base_capacity)                           \
   (wapp_mem_arena_allocator_init_custom(base_capacity, WAPP_MEM_ALLOC_RESERVE, false))
 #define wapp_mem_arena_allocator_init_commit(base_capacity)                    \
@@ -33,4 +37,8 @@ Allocator wapp_mem_arena_allocator_init_custom(u64 base_capacity, MemAllocFlags
 void wapp_mem_arena_allocator_clear(Allocator *allocator);
 void wapp_mem_arena_allocator_destroy(Allocator *allocator);
 
+#ifdef WAPP_PLATFORM_CPP
+END_C_LINKAGE
+#endif // !WAPP_PLATFORM_CPP
+
 #endif // !MEM_ARENA_ALLOCATOR_H

src/core/mem/utils/mem_utils.h

@@ -6,6 +6,14 @@
 #include "../../../common/aliases/aliases.h"
 #include "../../../common/platform/platform.h"
 
+#ifdef WAPP_PLATFORM_CPP
+BEGIN_C_LINKAGE
+#endif // !WAPP_PLATFORM_CPP
+
 void *wapp_mem_util_align_forward(void *ptr, u64 alignment);
 
+#ifdef WAPP_PLATFORM_CPP
+END_C_LINKAGE
+#endif // !WAPP_PLATFORM_CPP
+
 #endif // !MEM_UTILS_H