subtract_with_carry::subtract_with_carry

构造引擎。

subtract_with_carry();
explicit subtract_with_carry(unsigned long x0 = default_seed);
template<class Gen>
   subtract_with_carry(Gen& gen);
subtract_with_carry(const subtract_with_carry& right);
subtract_with_carry(subtract_with_carry& right);

参数

• x0
  种子值。

• Gen
  种子生成器的类型。

• gen
  种子生成器。

• right
  subtract_with_carry 对象。

备注

第一个构造函数构造一个subtract_with_carry对象并通过调用 seed()将其初始化。

第二个构造函数构造一个subtract_with_carry对象并通过调用 seed(x0)将其初始化。

第三个构造函数构造一个subtract_with_carry对象并通过调用 seed(gen)将其初始化。

第四个和第五个构造函数通过将一subtract_with_carry对象构造一subtract_with_carry对象。

示例

// std_tr1__random__subtract_with_carry_construct.cpp 
// compile with: /EHsc 
#include <random> 
#include <iostream> 
 
typedef std::mt19937 Myeng; 
typedef std::subtract_with_carry<unsigned int, 1 << 24, 
    10, 24> Myceng; 
int main() 
    { 
    Myeng eng; 
    Myceng ceng; 
    Myceng::result_type compval = ceng(); 
 
    compval = compval;  // to quiet "unused" warnings 
 
    std::cout << "M == " << Myceng::modulus << std::endl; 
    std::cout << "S == " << Myceng::short_lag << std::endl; 
    std::cout << "R == " << Myceng::long_lag << 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 
 
    Myceng ceng3(5UL);  // construct with unsigned long seed 
    ceng3.seed(5UL);  // seed with unsigned long 
 
    return (0); 
    } 
 

要求

标头: <random>

命名空间: std

请参见

参考

<random>

subtract_with_carry Class