std::mersenne_twister_engine<UIntType,w,n,m,r,a,u,d,s,b,t,c,l,f>::seed
From cppreference.com
void seed( result_type value = default_seed );
|
(1) | (since C++11) |
template< class SeedSeq >
void seed( SeedSeq& seq );
|
(2) | (since C++11) |
Sets the state of the random-number engine.
1) Right after the state is set,
*this == std::mersenne_twister_engine(value) is true.2) Right after the state is set,
*this == std::mersenne_twister_engine(seq) is true.Parameters
| value | - | seed value to use to set the state |
| seq | - | seed sequence to use to set the state |
Exceptions
Complexity
1) Same as
std::mersenne_twister_engine(value).2) Same as
std::mersenne_twister_engine(seq).Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 2181 | C++11 | overload (2) would not throw even if the seq.generate call throws
|
propagates the exception |
See also
| constructs the engine (public member function) |
Example
Run this code
#include <iostream>
#include <random>
int main()
{
std::mt19937 gen;
// Seed the engine with an unsigned int
gen.seed(1);
std::cout << "after seed by 1: " << gen() << '\n';
// Seed the engine with two unsigned ints
std::seed_seq sseq{1, 2};
gen.seed(sseq);
std::cout << "after seed by {1,2}: " << gen() << '\n';
}
Possible output:
after seed by 1: 1791095845
after seed by {1,2}: 3127717181