std::is_placeholder - Man Page

Determines if the given type _Tp is a placeholder in a bind() expression and, if so, which placeholder it is.

Synopsis

#include <functional>

Inherits std::integral_constant< int, 0 >.

typedef integral_constant< int, __v > type
typedef int value_type

constexpr operator value_type () const noexcept
constexpr value_type operator() () const noexcept

static constexpr int value

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].

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