View Compilation Error

0_0_35530762_26018.cpp: In function 'std::pair<double, double> rotate(std::pair<double, double>, bool)':
0_0_35530762_26018.cpp:33:21: error: missing template arguments before '{' token
   return flag ? pair{-d.second, d.first} : pair{d.second, -d.first};
                     ^
0_0_35530762_26018.cpp:33:21: error: expected ':' before '{' token
0_0_35530762_26018.cpp:33:21: error: expected primary-expression before '{' token
0_0_35530762_26018.cpp:33:21: error: expected ';' before '{' token
0_0_35530762_26018.cpp:33:40: error: expected ';' before '}' token
   return flag ? pair{-d.second, d.first} : pair{d.second, -d.first};
                                        ^
0_0_35530762_26018.cpp:33:42: error: expected primary-expression before ':' token
   return flag ? pair{-d.second, d.first} : pair{d.second, -d.first};
                                          ^