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/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