---
name: "__gnu_cxx::project2nd"
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/__gnu_cxx::project2nd"
---

# \_\_gnu\_cxx::project2nd(3)

An SGI extension .

## NAME

\_\_gnu\_cxx::project2nd\< \_Arg1, \_Arg2 \> - An **SGI extension** .

## SYNOPSIS

\#include \<functional\>

### Public Types

typedef \_Arg1 **first\_argument\_type**\
 first\_argument\_type is the type of the first argument  typedef \_Arg2 **result\_type**\
 result\_type is the return type  typedef \_Arg2 **second\_argument\_type**\
 second\_argument\_type is the type of the second argument

### Public Member Functions

\_Arg2 **operator()** (const \_Arg1 &, const \_Arg2 &\_\_y) const\

## Detailed Description

### template\<class \_Arg1, class \_Arg2\>

struct \_\_gnu\_cxx::project2nd\< \_Arg1, \_Arg2 \>"An **SGI extension** .

## Member Typedef Documentation

### typedef \_Arg1 std::binary\_function\< \_Arg1, \_Arg2, \_Arg2 \>::first\_argument\_type \[inherited\]

first\_argument\_type is the type of the first argument

### typedef \_Arg2 std::binary\_function\< \_Arg1, \_Arg2, \_Arg2 \>::result\_type \[inherited\]

result\_type is the return type

### typedef \_Arg2 std::binary\_function\< \_Arg1, \_Arg2, \_Arg2 \>::second\_argument\_type \[inherited\]

second\_argument\_type is the type of the second argument

## Author

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