std::_Placeholder< _Num >(3) Library Functions Manual NAME std::_Placeholder< _Num > - The type of placeholder objects defined by libstdc++. SYNOPSIS #include Detailed Description template struct std::_Placeholder< _Num >"The type of placeholder objects defined by libstdc++. Since C++11 Author Generated automatically by Doxygen for libstdc++ from the source code. libstdc++ std::_Placeholder< _Num >(3)