#include<boost/spirit/include/karma.hpp>
#include<boost/spirit/include/karma_format_attr.hpp>
#include<list>
#include<iostream>

//auto par = '{' << -(boost::spirit::karma::int_ % ',') << '}';//This would lead error!
int main(){
	using namespace std;
	namespace karma = boost::spirit::karma;	
	list<int> l{1, 2, 4};
	auto par = '{' << -(boost::spirit::karma::int_ % ',') << '}';//This would not!
	cout<<karma::format(par, l)<<endl;
	return 0;
}