---
name: "__gnu_parallel::_RandomNumber"
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_parallel::_RandomNumber"
---

# \_\_gnu\_parallel::\_RandomNumber(3)

Random number generator, based on the Mersenne twister.

## NAME

\_\_gnu\_parallel::\_RandomNumber - Random number generator, based on the Mersenne twister.

## SYNOPSIS

\#include \<random\_number.h\>

### Public Member Functions

**\_RandomNumber** ()\
 Default constructor. Seed with 0.  **\_RandomNumber** (uint32\_t \_\_seed, uint64\_t \_M\_supremum=0x100000000ULL)\
 Constructor.  unsigned long **\_\_genrand\_bits** (int \_\_bits)\
 Generate a number of random bits, run-time parameter.  uint32\_t **operator()** ()\
 Generate unsigned random 32-bit integer.  uint32\_t **operator()** (uint64\_t local\_supremum)\
 Generate unsigned random 32-bit integer in the interval \[0,local\_supremum).

## Detailed Description

Random number generator, based on the Mersenne twister.

## Constructor & Destructor Documentation

### \_\_gnu\_parallel::\_RandomNumber::\_RandomNumber () \[inline\]

Default constructor. Seed with 0.

### \_\_gnu\_parallel::\_RandomNumber::\_RandomNumber (uint32\_t \_\_seed, uint64\_t \_M\_supremum = 0x100000000ULL) \[inline\]

Constructor.

**Parameters**

*\_\_seed* Random \_\_seed. \
 *\_M\_supremum* Generate integer random numbers in the interval \[0,\_M\_supremum).

## Member Function Documentation

### unsigned long \_\_gnu\_parallel::\_RandomNumber::\_\_genrand\_bits (int \_\_bits) \[inline\]

Generate a number of random bits, run-time parameter.

**Parameters**

*\_\_bits* Number of bits to generate.

### uint32\_t \_\_gnu\_parallel::\_RandomNumber::operator() () \[inline\]

Generate unsigned random 32-bit integer.

### uint32\_t \_\_gnu\_parallel::\_RandomNumber::operator() (uint64\_t local\_supremum) \[inline\]

Generate unsigned random 32-bit integer in the interval \[0,local\_supremum).

## Author

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