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nothke/defer.h

Created December 18, 2024 15:33
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Zig/Go/Odin-like defer macro for C/C++
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defer.h
#ifndef _DEFER_H
#define _DEFER_H
struct defer_dummy {};
template <class F> struct deferrer { F f; ~deferrer() { f(); } };
template <class F> deferrer<F> operator*(defer_dummy, F f) { return {f}; }
#define DEFER_(LINE) defer##LINE
#define DEFER(LINE) DEFER_(LINE)
#define defer const auto DEFER(__LINE__) = defer_dummy{} *[&]()
#endif //_DEFER_H
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