std::experimental::reseed

 

C++

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Feature test macros (C++20)

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Technical specifications

Symbols index

External libraries

 

Technical specifications

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)

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Library fundamentals v2

experimental::propagate_const

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experimental::randint

detection idiom

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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)