Function defer

modules/core/base/include/SkrBase/misc/defer.hpp:35–38

template <typename F>
detail::defer_raii<F> defer(F&& f)
{
    return { std::forward<F>(f) };
}

#define SKR_DEFER_ACTUALLY_JOIN(x, y) x##y
#define SKR_DEFER_JOIN(x, y) SKR_DEFER_ACTUALLY_JOIN(x, y)