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code-disaster/not_a_bool.cc

Created May 5, 2017 13:45
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not_a_bool.cc
/*
A hack found at stackoverflow.com to raise a compiler warning if a non-boolean
expression is silently converted to bool in conditional statements.
*/
struct not_a_bool {};
template< typename T >
not_a_bool ERROR_CONDITIONAL_EXPRESSION_IS_NOT_BOOL(T /*value*/)
{
return not_a_bool();
}
bool ERROR_CONDITIONAL_EXPRESSION_IS_NOT_BOOL(bool value);
#define if(x) if(ERROR_CONDITIONAL_EXPRESSION_IS_NOT_BOOL(x))
#define while(x) while(ERROR_CONDITIONAL_EXPRESSION_IS_NOT_BOOL(x))
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