With C++17's compile-time conditionals, plus good old C preprocessor macros, you could do this: #define MATCH_VARIANT(x) [](auto& x) #define CASE_VARIA

With C++17's compile-time conditionals, plus good old C preprocessor macros, you could do this: #define MATCH_VARIANT(x) [](auto& x) #define CASE_VARIANT(x, T) constexpr (std::is_same_v<std::decay_t<decltype(x)>, T>) MATCH_VARIANT(arg) { if CASE_VARIANT(arg, string) { printf("string: %s\n", arg.c_str()); // ... } else if CASE_VARIANT(arg, int) { printf("integer: %d\n", arg); // ... } else if CASE_VARIANT(arg, bool) { printf("bool: %d\n", arg); // ... } } (MATCH_VARIANT could be extended to allow capturing vairables, or just omit that macro, it saves less typing than CASE_VARIANT anyway.)