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discard_block::operator()

Returns a random value.

result_type operator()();

The member function returns the next value in the sequence.

 

// std_tr1__random__discard_block_operator_fn.cpp 
// compile with: /EHsc 
#include <random> 
#include <iostream> 
 
typedef std::tr1::mt19937 Myeng; 
typedef std::tr1::discard_block<Myeng, 2, 1> Myceng; 
int main() 
    { 
    Myeng eng; 
    Myceng ceng; 
    const Myceng::base_type& base = ceng.base(); // get base engine 
    Myceng::result_type compval = ceng(); 
 
    compval = compval;  // to quiet "unused" warnings 
    base.min(); 
 
    std::cout << "P == " << Myceng::block_size << std::endl; 
    std::cout << "R == " << Myceng::used_block << 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); 
    } 
 
P == 2 R == 1 min == 0 max == 4294967295 a random value == 3499211612 a random value == 3890346734 a random value == 545404204

Header: <random>

Namespace: std::tr1

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