unused.hpp

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#pragma once
#include <version>
 
#if __cplusplus > 202302L && defined(__cpp_placeholder_variables)
#  define unused_ _
#else
#  ifdef __COUNTER__
#    define __xtd_unused_unique_id_ __COUNTER__
#  else
#    define __xtd_unused_unique_id_ __LINE__
#  endif
#  define __xtd_unused_concat_hidden__(a, b) a ## b
#  define __xtd_unused_concat_(a, b) __xtd_unused_concat_hidden__(a, b)

#  define unused_ __xtd_unused_concat_(__xtd_no_name_, __xtd_unused_unique_id_)
#endif

#define __ unused_