---
name: "std::_Select1st"
section: "3"
platform: "linux"
package: "libstdc++6-4.1-doc"
version: "4.1.1-21"
release: "Debian 4.0 (Etch)"
platforms: ["linux"]
url: "https://new.carta.tech/std::_Select1st"
---

# std::\_Select1st(3)

## NAME

std::\_Select1st -

## SYNOPSIS

Inherits **unary\_function\< \_Pair, \_Pair::first\_type \>**.

Inherited by **select1st**.

## Detailed Description

### template\<class \_Pair\> struct std::\_Select1st\< \_Pair \>

Definition at line 542 of file stl\_function.h.

### Public Types

typedef \_Pair **argument\_type**\
 typedef \_Pair::first\_type **result\_type**\

### Public Member Functions

const \_Pair::first\_type & **operator()** (const \_Pair &\_\_x) const \
 \_Pair::first\_type & **operator()** (\_Pair &\_\_x) const\

## Member Typedef Documentation

### typedef \_Pair argument\_type` [inherited]`

`argument_type` is the type of the

Definition at line 104 of file stl\_function.h.

### typedef \_Pair::first\_type result\_type` [inherited]`

argument (no surprises here) `result_type` is the return type

Definition at line 107 of file stl\_function.h.

## Author

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