#ifndef MACRO_LMMKBZRX
#define MACRO_LMMKBZRX

#define EXPAND(x) x
#define CALL(M, ...) EXPAND(M(__VA_ARGS__))

// macro helper
#define JOIN_IMPL(a, b) a##b
#define JOIN(a, b) JOIN_IMPL(a, b)

// defer function or lambda.
#define DEFERF(func) ExitCall JOIN(defer_, __LINE__)(func)
// defer simple expression
#define DEFER1(expr) DEFERF([&]() { expr; })
#endif // end of include guard: MACRO_LMMKBZRX