    #include <iostream>
    #define RemParens_(VA) RemParens__(VA)
    #define RemParens__(VA) RemParens___ VA
    #define RemParens___(...) __VA_ARGS__
    #define DoConcat_(A,B) DoConcat__(A,B)
    #define DoConcat__(A,B) A##B
    #define defer(BODY) struct DoConcat_(Defer,__LINE__) { ~DoConcat_(Defer,__LINE__)() { RemParens_(BODY) } } DoConcat_(_deferrer,__LINE__)

    int main() {
        {
            defer(( std::cout << "Hello World" << std::endl; ));
            std::cout << "This goes first" << std::endl;
        }
    }

▲ rezonant 2 hours ago | parent | next [-]

Why would that be preferable to just using an RAII style scope_exit with a lambda

	▲	troglo-byte 2 hours ago \| parent [-]
		Meh, I was going to use the preprocessor for __LINE__ anyways (to avoid requiring a variable name) so I just made it an "old school lambda." Besides, scope_exit is in C++23 which is still opt-in in most cases.

▲ chuckadams an hour ago | parent | prev | next [-]

"We have syntax macros at home"

▲ 2 hours ago | parent | prev [-]

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