discard_block::discard_block

Constructs the engine.

discard_block();
explicit discard_block(const base_type& eng);
explicit discard_block(result_type seed);
template<class Gen>
   discard_block(Gen& gen);
discard_block(const discard_block& right);
discard_block(discard_block& right);

Parameters

• eng
  An engine object.

• seed
  A seed value.

• Gen
  The type of the seed generator.

• gen
  The seed generator.

• right
  A discard_block Class object.

Remarks

The first constructor constructs a discard_block object with a default-initialized engine. The second constructor constructs a discard_block object with a copy of an engine object. The third constructor constructs a discard_block object with an initial seed value.The fourth constructor constructs a discard_block object with an engine initialized from a generator. The fifth and sixth constructors construct a discard_block object by copying a discard_block object.

Example

// std_tr1__random__discard_block_discard_block.cpp 
// compile with: /EHsc 
#include <random> 
#include <iostream> 
 
typedef std::mt19937 Myeng; 
typedef std::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

Requirements

Header: <random>

Namespace: std

See Also

Reference

<random>

discard_block Class