封装回调函数扔掉的代码-_-
using namespace traits; template class any_fun_operator { //using U1 = fun_traits; //using type0 = easy_traits; public: void cal
using namespace traits; template class any_fun_operator { //using U1 = fun_traits; //using type0 = easy_traits; public: void cal
c++17方案 auto f = [](int a, double b, std::string c) { std::cout