std::is_placeholder< _Tp >(3) Library Functions Manual NAME std::is_placeholder< _Tp > - Determines if the given type _Tp is a placeholder in a bind() expression and, if so, which placeholder it is. SYNOPSIS #include Inherits std::integral_constant< int, 0 >. Public Types using type using value_type Public Member Functions constexpr operator value_type () const noexcept Static Public Attributes static constexpr int value Detailed Description template struct std::is_placeholder< _Tp >"Determines if the given type _Tp is a placeholder in a bind() expression and, if so, which placeholder it is. C++11 [func.bind.isplace]. Since C++11 Author Generated automatically by Doxygen for libstdc++ from the source code. libstdc++ std::is_placeholder< _Tp >(3)