std::is_placeholder< _Tp > - Determines if the given type _Tp is a placeholder in a bind() expression

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                                                    libstdc++                   std::is_placeholder<_Tp>(3cxx)

template<typename_Tp>
       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

       std::is_placeholder< _Tp > - Determines if the given type _Tp is a placeholder in a bind() expression
       and, if so, which placeholder it is.

       #include <functional>

       Inherits std::integral_constant<int,0>.

   PublicTypestypedefintegral_constant< int, __v > typetypedef int value_typePublicMemberFunctions
       constexpr operatorvalue_type () const noexcept
       constexpr value_type operator() () const noexcept

   StaticPublicAttributesstatic constexpr int value