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f9845abe39
Sadly, in C++ there's not an universal way to get what language standard is used to compile GLib-based programs, in fact while most compilers relies on `__cplusplus`, MSVC is defining that, but it does not use it to expose such information (unless `/Zc:__cplusplus` arg is used). On the other side, MSVC reports the language standard via _MSVC_LANG [1]. This complication makes us defining some macros in a very complex way (such as glib_typeof()), because we need to perform many checks just to understand if a C++ compiler is used and what standard is expecting. To avoid this, define multiple macros that can be used to figure out what C++ standard is being used. [1] https://docs.microsoft.com/en-us/cpp/build/reference/zc-cplusplus?view=msvc-170
