20 General utilities library [utilities]

20.14 Function objects [function.objects]

20.14.14 Function object binders [func.bind]

20.14.14.2 Class template is_­placeholder [func.bind.isplace]

namespace std {
  template<class T> struct is_placeholder;      // see below
}
The class template is_­placeholder can be used to detect the standard placeholders _­1, _­2, and so on.
The function template bind uses is_­placeholder to detect placeholders.
Specializations of the is_­placeholder template shall meet the Cpp17UnaryTypeTrait requirements ([meta.rqmts]).
The implementation provides a definition that has the base characteristic of integral_­constant<int, J> if T is the type of std::placeholders::J, otherwise it has a base characteristic of integral_­constant<int, 0>.
A program may specialize this template for a program-defined type T to have a base characteristic of integral_­constant<int, N> with N > 0 to indicate that T should be treated as a placeholder type.