unused.h

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#pragma once
 
#ifdef __GNUC__ // Clang and GCC
#define UNUSED __attribute__((unused))
#elif defined(_MSC_VER) // MSVC
#define UNUSED                                                                 \
  __pragma(warning(suppress : 4100 /* unreferenced formal parameter */         \
                   4101            /* unreferenced local variable */           \
                   4505            /* unreferenced local function */           \
                   ))
#else
#define UNUSED /* nothing */
#endif