std::experimental::reseed

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Execution support library (C++26)

Technical specifications

Symbols index

External libraries

 

Experimental

Technical Specification

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals TS v2)

Library fundamentals 3 (library fundamentals TS v3)

Extensions for parallelism (parallelism TS)

Extensions for parallelism 2 (parallelism TS v2)

Extensions for concurrency (concurrency TS)

Extensions for concurrency 2 (concurrency TS v2)

Concepts (concepts TS)

Ranges (ranges TS)

Reflection (reflection TS)

Mathematical special functions (special functions TR)

Experimental Non-TS

Pattern Matching

Linear Algebra

std::execution

Contracts

2D Graphics

 

Library fundamentals v2

experimental::propagate_const

experimental::not_fn

experimental::observer_ptr

experimental::make_array

experimental::to_array

experimental::ostream_joiner

experimental::gcd

experimental::lcm

experimental::source_location

experimental::randint

detection idiom

uniform container erasure

logical operator type traits

 

Defined in header <experimental/random>
void reseed();	(1)	(library fundamentals TS v2)
void reseed( std::default_random_engine::result_type value );	(2)	(library fundamentals TS v2)

Reseeds the per-thread random number engine and any std::uniform_int_distribution instances used by randint.

1) Sets the per-thread engine to an unpredictable state.

2) Seeds the per-thread engine g as if by g.seed(value).

Parameters

value

-

value of the new seed

Remarks

Subsequent calls to randint do not depend on values produced by the per-thread engine prior to calling reseed.

Example

Run this code

#include <experimental/random>
#include <iostream>
 
int main()
{
    std::experimental::reseed();
 
    std::cout << "Random 2-digit decimal numbers: ";
 
    for (auto i = 0; i != 3; ++i)
        std::cout << std::experimental::randint(10, 99) << ' ';
    std::cout << '\n';
}

Possible output:

Random 2-digit decimal numbers: 41 60 56

See also

randint

generates a random integer in the specified range (function template)