linear_congruential::seed
Semena motoru
void seed(UIntType x0 = default_seed);
template<class Gen>
void seed(Gen& gen);
Parametry
x0
Hodnota osiva.Gen
Typ generátoru osiva.gen
Generátor osiva.
Poznámky
Nastaví první osiva funkce Uložená hodnota stored_value na 1 mod M Pokud c mod M == 0 a x0 mod M == 0, jinak nastaví hodnoty uložené na x0 mod M.Volání funkce osiva druhé seed(gen()).
Příklad
// std_tr1__random__linear_congruential_seed.cpp
// compile with: /EHsc
#include <random>
#include <iostream>
typedef std::mt19937 Myeng;
typedef std::linear_congruential<int, 16807, 0,
(int)((1U << 31) - 1)> Myceng; // same as minstd_rand0
int main()
{
Myeng eng;
Myceng ceng;
Myceng::result_type compval = ceng();
compval = compval; // to quiet "unused" warnings
std::cout << "A == " << Myceng::multiplier << std::endl;
std::cout << "C == " << Myceng::increment << std::endl;
std::cout << "M == " << Myceng::modulus << std::endl;
std::cout << "min == " << ceng.min() << std::endl;
std::cout << "max == " << ceng.max() << std::endl;
ceng.seed(); // reseed base engine
std::cout << "a random value == " << ceng() << std::endl;
std::cout << "a random value == " << ceng() << std::endl;
std::cout << "a random value == " << ceng() << std::endl;
Myceng ceng2(eng); // construct with generator
ceng2.seed(eng); // seed with generator
return (0);
}
Požadavky
Záhlaví: <random>
Obor názvů: std