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/common/aliases/aliases.h

@@ -30,13 +30,17 @@
 
 #define b32 uint32_t
 
+#ifndef WAPP_PLATFORM_CPP
+
 #ifndef false
 #define false (b32)0
-#endif
+#endif // !false
 
 #ifndef true
 #define true (b32)1
-#endif
+#endif // !true
+
+#endif // !WAPP_PLATFORM_CPP
 
 #define i8 int8_t
 #define i16 int16_t
@@ -54,4 +58,10 @@
 #define internal static
 #define persistent static
 
+#ifdef WAPP_PLATFORM_CPP
+#define class_mem static
+#define BEGIN_C_LINKAGE extern "C" {
+#define END_C_LINKAGE }
+#endif // WAPP_PLATFORM_CPP
+
 #endif // !ALIASES_H

src/common/assert/assert.h

@@ -1,10 +1,18 @@
 // vim:fileencoding=utf-8:foldmethod=marker
 
+#ifndef WAPP_ASSERT_H
+#define WAPP_ASSERT_H
+
 #include "../aliases/aliases.h"
+#include "../platform/platform.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <inttypes.h>
 
+#ifdef WAPP_PLATFORM_CPP
+BEGIN_C_LINKAGE
+#endif // !WAPP_PLATFORM_CPP
+
 #define wapp_static_assert(EXPR, MSG) extern char ASSERTION_FAILED[EXPR ? 1 : -1]
 #define wapp_runtime_assert(EXPR, MSG) __wapp_runtime_assert(EXPR, MSG)
 
@@ -25,3 +33,9 @@
     abort();                                                                          \
   }                                                                                   \
 } while(false)
+
+#ifdef WAPP_PLATFORM_CPP
+END_C_LINKAGE
+#endif // !WAPP_PLATFORM_CPP
+
+#endif // !WAPP_ASSERT_H

src/common/misc/misc_utils.h

@@ -5,6 +5,10 @@
 
 #include "../aliases/aliases.h"
 
+#ifdef WAPP_PLATFORM_CPP
+BEGIN_C_LINKAGE
+#endif // !WAPP_PLATFORM_CPP
+
 #define KB(SIZE) (SIZE * 1024ull)
 #define MB(SIZE) (KB(SIZE) * 1024)
 #define GB(SIZE) (MB(SIZE) * 1024)
@@ -34,6 +38,19 @@
   ) + 1 \
 )
 
+#ifdef WAPP_PLATFORM_CPP
+#define wapp_misc_utils_va_args_count(T, ...) va_args_count<T>(__VA_ARGS__)
+#else
 #define wapp_misc_utils_va_args_count(T, ...) (sizeof((T[]){__VA_ARGS__})/sizeof(T))
+#endif // !WAPP_PLATFORM_CPP
+
+#ifdef WAPP_PLATFORM_CPP
+END_C_LINKAGE
+
+template <typename T, typename... Args>
+constexpr u64 va_args_count(Args&&...) {
+    return sizeof...(Args);
+}
+#endif // !WAPP_PLATFORM_CPP
 
 #endif // !MISC_UTILS_H

src/common/platform/platform.h

@@ -61,7 +61,30 @@
 #endif
 
 #ifdef __cplusplus
-  #error "WAPP is a C only library"
+  #define WAPP_PLATFORM_CPP
+  #define WAPP_PLATFORM_CPP_VERSION __cplusplus
+  #define WAPP_PLATFORM_CPP98_VERSION 199711L
+  #define WAPP_PLATFORM_CPP11_VERSION 201103L
+  #define WAPP_PLATFORM_CPP14_VERSION 201402L
+  #define WAPP_PLATFORM_CPP17_VERSION 201703L
+  #define WAPP_PLATFORM_CPP20_VERSION 202002L
+  #define WAPP_PLATFORM_CPP23_VERSION 202302L
+
+  #if WAPP_PLATFORM_CPP_VERSION == WAPP_PLATFORM_CPP98_VERSION
+    #define WAPP_PLATFORM_CPP98
+  #elif WAPP_PLATFORM_CPP_VERSION == WAPP_PLATFORM_CPP11_VERSION
+    #define WAPP_PLATFORM_CPP11
+  #elif WAPP_PLATFORM_CPP_VERSION == WAPP_PLATFORM_CPP14_VERSION
+    #define WAPP_PLATFORM_CPP14
+  #elif WAPP_PLATFORM_CPP_VERSION == WAPP_PLATFORM_CPP17_VERSION
+    #define WAPP_PLATFORM_CPP17
+  #elif WAPP_PLATFORM_CPP_VERSION == WAPP_PLATFORM_CPP20_VERSION
+    #define WAPP_PLATFORM_CPP20
+  #elif WAPP_PLATFORM_CPP_VERSION == WAPP_PLATFORM_CPP23_VERSION
+    #define WAPP_PLATFORM_CPP23
+  #else
+    #error "Unrecognised C++ version"
+  #endif
 #else
   #define WAPP_PLATFORM_C