Common: uses _Countof in ARRAY_SIZE definition when available

Author: CarterLi

CMakeLists.txt

@@ -1343,6 +1343,15 @@ add_library(libfastfetch OBJECT
     ${LIBFASTFETCH_SRC}
 )
 
+include(CheckCSourceCompiles)
+check_c_source_compiles("int main(void){int arr[1];return _Countof(arr);}" COMPILER_SUPPORTS_COUNT_OF)
+if(COMPILER_SUPPORTS_COUNT_OF)
+    message(STATUS "_Countof is supported by the compiler")
+    target_compile_definitions(libfastfetch PUBLIC FF_SUPPORTS_COUNT_OF=1)
+else()
+    message(STATUS "_Countof is NOT supported by the compiler")
+endif()
+
 if(yyjson_FOUND)
     target_compile_definitions(libfastfetch PUBLIC FF_USE_SYSTEM_YYJSON=1)
     target_link_libraries(libfastfetch PUBLIC yyjson::yyjson)

src/common/arrayUtils.h

@@ -3,7 +3,9 @@
 #include <assert.h>
 
 #ifdef __has_builtin
-    #if __has_builtin(__is_array)
+    #if !__cplusplus && FF_SUPPORTS_COUNT_OF
+        #define ARRAY_SIZE(x) _Countof(x)
+    #elif __has_builtin(__is_array)
         #define ARRAY_SIZE(x) ({ static_assert(__is_array(__typeof__(x)), "Must be an array"); (uint32_t) (sizeof(x) / sizeof(*(x))); })
     #elif __has_builtin(__builtin_types_compatible_p)
         #define ARRAY_SIZE(x) ({ static_assert(!__builtin_types_compatible_p(__typeof__(x), __typeof__(&*(x))), "Must not be a pointer"); (uint32_t) (sizeof(x) / sizeof(*(x))); })