18 lines
482 B
C
18 lines
482 B
C
#define MAYBE_TYPE(name, type) struct maybe_##name {type value; char is_value;}
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#define MAYBE(name) struct maybe_##name
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#define ENABLE_RETURN(type) MAYBE(type) __return_value
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#define RETURN_VALUE(x) {\
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__return_value.is_value = 1;\
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__return_value.value = x;\
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return __return_value;\
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}
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#define RETURN_NOTHING() {\
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__return_value.is_value = 0;\
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return __return_value;\
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}
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#define IS_VALUE(x) if((x).is_value)
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#define IS_NOT_VALUE(x) if(!(x).is_value)
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#define VALUE(x) (x).value
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