require() with REQUIRE() macro to deal with source locations, until we get a real std::source_location type

require.hpp

#include <stdexcept>

struct require_error : std::runtime_error {
    using std::runtime_error::runtime_error;
};

void require(bool b, char const *message) {
    if (!b) {
        throw require_error(message);
    }
}

#define STRINGIZE2(x) STRINGIZE(x)
#define STRINGIZE(x) #x
#define SOURCE_LOCATION __FILE__ ":" STRINGIZE2(__LINE__)

#define REQUIRE(condition, reason) (require((condition), SOURCE_LOCATION ": " reason))