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std::independent_bits_engine<Engine,W,UIntType>::independent_bits_engine

From cppreference.com
 
 
 
Pseudo-random number generation
Uniform random bit generators
Engines and engine adaptors
Non-deterministic generator
Distributions
Uniform distributions
Bernoulli distributions
Poisson distributions
Normal distributions
Sampling distributions
Seed Sequences
(C++11)
C library
 
std::independent_bits_engine
Member functions
independent_bits_engine::independent_bits_engine
(C++11)
Generation
Characteristics
Non-member functions
(C++11)(C++11)(until C++20)
(C++11)(C++11)
 
independent_bits_engine();
(1) (since C++11)
explicit independent_bits_engine( result_type s );
(2) (since C++11)
template< class Sseq >
explicit independent_bits_engine( Sseq& seq );
(3) (since C++11)
explicit independent_bits_engine( const Engine& e );
(4) (since C++11)
explicit independent_bits_engine( Engine&& e );
(5) (since C++11)

Constructs new pseudo-random engine adaptor.

1) Default constructor. The underlying engine is also default-constructed.
2) Constructs the underlying engine with s.
3) Constructs the underlying engine with seed sequence seq. This constructor only participate in overload resolution if Sseq qualifies as a SeedSequence. In particular, this constructor does not participate in overload resolution if Sseq is implicitly convertible to result_type.
4) Constructs the underlying engine with a copy of e.
5) Move-constructs the underlying engine with e. e holds unspecified, but valid state afterwards.

[edit] Parameters

s - integer value to construct the underlying engine with
seq - seed sequence to construct the underlying engine with
e - pseudo-random number engine to initialize with

[edit] Example

#include <iostream>
#include <random>
 
int main()
{
    auto print = [](auto rem, auto engine, int count) {
        std::cout << rem << ": ";
        for (int i{}; i != count; ++i)
            std::cout << static_cast<unsigned>(engine()) << ' ';
        std::cout << '\n';
    };
 
    std::independent_bits_engine<std::mt19937, /*bits*/ 1, unsigned short>
        e1; // default-constructed
    print("e1", e1, 8);
 
    std::independent_bits_engine<std::mt19937, /*bits*/ 1, unsigned int>
        e2(1); // constructed with 1
    print("e2", e2, 8);
 
    std::random_device rd;
    std::independent_bits_engine<std::mt19937, /*bits*/ 3, unsigned long>
        e3(rd()); // seeded with rd()
    print("e3", e3, 8);
 
    std::seed_seq s{3,1,4,1,5};
    std::independent_bits_engine<std::mt19937, /*bits*/ 3, unsigned long long>
        e4(s); // seeded with seed-sequence s
    print("e4", e4, 8);
}

Possible output:

e1: 0 0 0 1 0 1 1 1
e2: 1 1 0 0 1 1 1 1
e3: 3 1 5 4 3 2 3 4
e4: 0 2 4 4 4 3 3 6