46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
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#ifndef MAG_DEFER_H
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#define MAG_DEFER_H
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/**
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* Zig-like defer macro for (gc)C and C++
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*
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* Based on:
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* https://gustedt.wordpress.com/2025/01/06/simple-defer-ready-to-use/
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* - but works with gcc(C), g++ and non-gcc c++ compilers.
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* - so it only does not work for other C compilers.
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*
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* Rem.: This [[gnu::always_inline]]
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* basically means __attribute__((always_inline))
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*/
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#ifdef __cplusplus
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template<typename T>
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struct __df_st : T {
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[[gnu::always_inline]]
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inline
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__df_st(T g) : T(g) {
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// empty
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}
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[[gnu::always_inline]]
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inline
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~__df_st() {
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T::operator()();
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}
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};
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#define __DEFER__(V) __df_st const V = [&](void)->void
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#define defer __DEFER(__COUNTER__)
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#define __DEFER(N) __DEFER_(N)
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#define __DEFER_(N) __DEFER__(__DEFER_VARIABLE_ ## N)
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#else
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#define __DEFER__(F, V) \
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[[gnu::always_inline]] inline auto void F(int*); \
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[[gnu::cleanup(F)]] int V; \
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[[gnu::always_inline]] inline auto void F(int*)
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#define defer __DEFER(__COUNTER__)
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#define __DEFER(N) __DEFER_(N)
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#define __DEFER_(N) __DEFER__(__DEFER_FUNCTION_ ## N, __DEFER_VARIABLE_ ## N)
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#endif /* __cplusplus */
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#endif /* MAG_DEFER_H */
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