---
name: "std::is_placeholder"
section: "3cxx"
platform: "linux"
package: "libstdc++-12-doc"
version: "12.4.0-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/std::is_placeholder/3cxx"
---

# std::is\_placeholder(3cxx)

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

## 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 <functional>`

Inherits **std::integral\_constant\< int, 0 \>**.

### Public Types

**typedef** **integral\_constant**\< int, **\_\_v** \> **type**\
 **typedef** int **value\_type**\

### Public Member Functions

constexpr **operator value\_type** () const noexcept\
 constexpr value\_type **operator()** () const noexcept\

### Static Public Attributes

**static** constexpr int **value**\

## Detailed Description

### 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

## Author

Generated automatically by Doxygen for libstdc++ from the source code.