std::experimental::shuffle

 

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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detection idiom

uniform container erasure

logical operator type traits

 

Defined in header <experimental/algorithm>
template< class RandomIt > void shuffle( RandomIt first, RandomIt last );		(library fundamentals TS v2)

Reorders the elements in the given range [first, last) such that each possible permutation of those elements has equal probability of appearance, using the per-thread random number engine as the random number generator.

Parameters

first, last	-	the range of elements to shuffle randomly
- RandomIt must meet the requirements of ValueSwappable and LegacyRandomAccessIterator.

Return value

(none)

Complexity

Linear in the distance between first and last.

Example

Run this code

#include <experimental/algorithm>
#include <iostream>
#include <string>
 
int main()
{
    std::string sample{"ABCDEF"};
 
    for (int i = 0; i != 4; ++i)
    {
        std::experimental::shuffle(sample.begin(), sample.end());
        std::cout << sample << '\n';
    }
}

Possible output:

DACBFE
CDFBAE
BDCAFE
BAFCED

See also

random_shuffleshuffle (until C++17)(C++11)

randomly re-orders elements in a range (function template)