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

# \_\_gnu\_parallel::exact\_tag(3cxx)

Forces parallel merging with exact splitting, at compile time.

## NAME

\_\_gnu\_parallel::exact\_tag - Forces parallel merging with exact splitting, at compile time.

## SYNOPSIS

`#include <tags.h>`

Inherits **\_\_gnu\_parallel::parallel\_tag**.

### Public Member Functions

**exact\_tag** (**\_ThreadIndex** \_\_num\_threads)\
 **\_ThreadIndex** **\_\_get\_num\_threads** ()\
 Find out desired number of threads.  void **set\_num\_threads** (**\_ThreadIndex** \_\_num\_threads)\
 Set the desired number of threads.

## Detailed Description

Forces parallel merging with exact splitting, at compile time.

## Member Function Documentation

### \_ThreadIndex \_\_gnu\_parallel::parallel\_tag::\_\_get\_num\_threads ()` [inline]`, ` [inherited]`

Find out desired number of threads.

**Returns**

Desired number of threads.

Referenced by **\_\_gnu\_parallel::\_\_parallel\_sort()**, **\_\_gnu\_parallel::\_\_parallel\_sort()**, **\_\_gnu\_parallel::\_\_parallel\_sort()**, **\_\_gnu\_parallel::\_\_parallel\_sort()**, **\_\_gnu\_parallel::\_\_parallel\_sort()**, **\_\_gnu\_parallel::\_\_parallel\_sort()**, and **\_\_gnu\_parallel::\_\_parallel\_sort()**.

### void \_\_gnu\_parallel::parallel\_tag::set\_num\_threads (\_ThreadIndex \_\_num\_threads)` [inline]`, ` [inherited]`

Set the desired number of threads.

**Parameters**

*\_\_num\_threads* Desired number of threads.

## Author

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