Ovenのelements_c使ってみました。
vector
#include <iostream> #include <vector> #include <utility> #include <string> #include <boost/foreach.hpp> #include <pstade/oven/elements.hpp> using namespace std; using namespace pstade::oven; int main() { vector<pair<int, string> > v; v.push_back(make_pair(3, "a")); v.push_back(make_pair(1, "b")); v.push_back(make_pair(4, "c")); BOOST_FOREACH (int item, v|elements_c<0>()) { cout << item << endl; } }
3 1 4
Secondを全て出力
#include <iostream> #include <vector> #include <utility> #include <string> #include <boost/foreach.hpp> #include <pstade/oven/elements.hpp> using namespace std; using namespace pstade::oven; int main() { vector<pair<int, string> > v; v.push_back(make_pair(3, "a")); v.push_back(make_pair(1, "b")); v.push_back(make_pair(4, "c")); BOOST_FOREACH(const string& item, v|elements_c<1>()) { cout << item << endl; } }
a b c
便利べんり。