random_device::operator()

傳回選擇性值。

result_type operator()();

備註

成員函式傳回在關閉的間隔平均分散的值 [min(), max()]。

範例

 

// std_tr1__random__random_device_operator_fn.cpp 
// compile with: /EHsc 
#include <random> 
#include <iostream> 
 
typedef std::random_device Myceng; 
int main() 
    { 
    Myceng ceng; 
    Myceng::result_type compval = ceng(); 
 
    compval = compval;  // to quiet "unused" warnings 
 
    std::cout << "entropy == " << ceng.entropy() << std::endl; 
    std::cout << "min == " << ceng.min() << std::endl; 
    std::cout << "max == " << ceng.max() << std::endl; 
 
    std::cout << "a random value == " << ceng() << std::endl; 
    std::cout << "a random value == " << ceng() << std::endl; 
    std::cout << "a random value == " << ceng() << std::endl; 
 
    return (0); 
    } 
 

需求

標題: <random>

命名空間: std

請參閱

參考

<random>

random_device Class