On: Implementing Go's defer keyword in C++

[evincarofautumn]

Side note, that DEFER macro should be variadic:

    #define DEFER(...) ScopeGuard CONCAT(_defer, __LINE__) = [&] () { __VA_ARGS__ ; }

Otherwise commas will be problematic—it’ll be treated as too many arguments to the macro if they’re not wrapped in parentheses. The reason being that the preprocessor understands parentheses as grouping delimiters, but not other bracket characters. Also note that I changed the double underscores to a single underscore, since the former is reserved for use by the implementation & standard library.

It’s this type of constant minor language-lawyering and clerical work that makes me both very good with C++ and very averse to using it anymore. (Though to be fair this particular case is also a problem with C, which I like nevertheless.)