normal_distribution::normal_distribution
建構散發。
normal_distribution(result_type mean0 = result_type(0.0),
result_type sigma0 = result_type(1.0));
explicit normal_distribution(const param_type& par0);
參數
mean0
表示釋放參數。sigma0
這個情況中碼發出參數。par0
用於參數封裝建構散發。
備註
前置條件: 0.0 <= sigma0
第一個建構函式建構儲存值 stored_mean 保留值 mean0 ,並儲存值 stored_sigma 保留值 sigma0的物件。
第二個建構函式會將參數從 par0初始化的物件。
範例
// std_tr1__random__normal_distribution_construct.cpp
// compile with: /EHsc
#include <random>
#include <iostream>
typedef std::ranlux64_base_01 Myeng;
typedef std::normal_distribution<double> Mydist;
int main()
{
Myeng eng;
Mydist dist(1.5, 2.0);
Mydist::input_type engval = eng();
Mydist::result_type distval = dist(eng);
distval = distval; // to quiet "unused" warnings
engval = engval;
std::cout << "mean == " << dist.mean() << std::endl;
std::cout << "sigma == " << dist.sigma() << std::endl;
dist.reset(); // discard any cached values
std::cout << "a random value == " << dist(eng) << std::endl;
std::cout << "a random value == " << dist(eng) << std::endl;
std::cout << "a random value == " << dist(eng) << std::endl;
return (0);
}
需求
標題: <random>
命名空間: std