boost_spirite_02.cpp

#include <iostream>
#include <string>
#include <boost\config\warning_disable.hpp>
#include <boost\spirit\home\x3.hpp>

namespace client {
	namespace x3 = boost::spirit::x3;
	using x3::_attr;

	struct print_action {
		template<typename Context>
		void operator()(Context const & ctx) const
		{
			std::cout << _attr(ctx) << std::endl;
		}
	};
}

int main() {
	using namespace boost::spirit::x3;
	using client::print_action;

	std::string input("1234");

	parse(std::begin(input), std::end(input), int_[print_action()]);

	return 0;
}