52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
/**
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* See Copyright Notice in picrin.h
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*/
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#ifndef PICRIN_UTIL_H
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#define PICRIN_UTIL_H
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#if defined(__cplusplus)
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extern "C" {
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#endif
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#if __STDC_VERSION__ >= 201112L
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# include <stdnoreturn.h>
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# define pic_noreturn noreturn
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#elif __GNUC__ || __clang__
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# define pic_noreturn __attribute__((noreturn))
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#else
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# define pic_noreturn
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#endif
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#define PIC_FALLTHROUGH ((void)0)
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#define PIC_UNUSED(v) ((void)(v))
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#define PIC_GENSYM2_(x,y) PIC_G##x##_##y##_
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#define PIC_GENSYM1_(x,y) PIC_GENSYM2_(x,y)
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#if defined(__COUNTER__)
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# define PIC_GENSYM(x) PIC_GENSYM1_(__COUNTER__,x)
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#else
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# define PIC_GENSYM(x) PIC_GENSYM1_(__LINE__,x)
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#endif
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#if GCC_VERSION >= 40500 || __clang__
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# define PIC_UNREACHABLE() (__builtin_unreachable())
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#else
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# define PIC_UNREACHABLE() (assert(false))
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#endif
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#define PIC_SWAP(type,a,b) \
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PIC_SWAP_HELPER_(type, PIC_GENSYM(tmp), a, b)
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#define PIC_SWAP_HELPER_(type,tmp,a,b) \
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do { \
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type tmp = (a); \
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(a) = (b); \
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(b) = tmp; \
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} while (0)
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#if defined(__cplusplus)
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}
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#endif
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#endif
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