CommandLine.h

template<std::vector<std::string>* arg, std::string_view* flag, std::function<void()>* f>
struct CommandLineLambda {
	//returns whether or not the argument was called
	static inline bool runArg() {
		auto iter = std::find(arg->begin(), arg->end(), *flag);
		if (iter != arg->end()) {
			(*f)();
			return true;
		}
		return false;
	}
};

template<std::vector<std::string>* arg, std::string_view* flag, std::optional<std::string>* var>
struct CommandLineOptional {
	//returns the success of parsing the argument
	static inline bool runArg() {
		auto iter = std::find(arg->begin(), arg->end(), *flag);
		if (iter != arg->end()) {
			if (
				iter == std::prev(arg->end()) ||
				std::next(iter)->front() == '-'
			) {
				printf("No argument supplied to %s\n", "-a");
				return false;
			} else {
				(*var) = *(std::next(iter));
			}
		}
		return true;
	}
};