---
name: "std::binder1st"
section: "3"
platform: "linux"
package: "gcc"
version: "16.2.1+r23+gd564253eb6c8-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/std::binder1st"
---

# std::binder1st(3)

One of the binder functors.

## NAME

std::binder1st\< \_Operation \> - One of the **binder functors**.

## SYNOPSIS

\#include \<functional\>

Inherits **std::unary\_function\< \_Operation::second\_argument\_type, \_Operation::result\_type \>**.

### Public Types

typedef \_Operation::second\_argument\_type **argument\_type**\
 argument\_type is the type of the argument  typedef \_Operation::result\_type **result\_type**\
 result\_type is the return type

### Public Member Functions

**binder1st** (const \_Operation &\_\_x, const typename \_Operation::first\_argument\_type &\_\_y)\
 \_Operation::result\_type **operator()** (const typename \_Operation::second\_argument\_type &\_\_x) const\
 \_Operation::result\_type **operator()** (typename \_Operation::second\_argument\_type &\_\_x) const\

### Protected Attributes

\_Operation **op**\
 \_Operation::first\_argument\_type **value**\

## Detailed Description

### template\<typename \_Operation\>

class std::binder1st\< \_Operation \>"One of the **binder functors**.

## Member Typedef Documentation

### typedef \_Operation::second\_argument\_type std::unary\_function\< \_Operation::second\_argument\_type, \_Operation::result\_type \>::argument\_type \[inherited\]

argument\_type is the type of the argument

### typedef \_Operation::result\_type std::unary\_function\< \_Operation::second\_argument\_type, \_Operation::result\_type \>::result\_type \[inherited\]

result\_type is the return type

## Author

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