Export (0) Print
Expand All

uniform_real::operator()

Returns a random value.

template<class Engine>
bool operator()(Engine& eng);

Engine

The type of the random engine.

eng

The random engine.

The member function uses the engine eng as a source of uniformly distributed floating-point values and returns floating-point values with each value x in the half-open range [min(), max()) occurring with equal probability and values outside that range occuring with probability 0.

 

// std_tr1__random__uniform_real_operator_fn.cpp 
// compile with: /EHsc 
#include <random> 
#include <iostream> 
 
typedef std::tr1::mt19937 Myeng; 
typedef std::tr1::uniform_int<unsigned int> Myceng; 
int main() 
    { 
    Myeng eng; 
    Myceng ceng(1, 1 << 15); 
    Myceng::input_type engval = eng(); 
    Myceng::result_type compval = ceng(eng); 
 
    compval = compval;  // to quiet "unused" warnings 
    engval = engval; 
 
    std::cout << "min == " << ceng.min() << std::endl; 
    std::cout << "max == " << ceng.max() << std::endl; 
 
    ceng.reset(); // discard any cached values 
    std::cout << "a random value == " << ceng(eng) << std::endl; 
    std::cout << "a random value == " << ceng(eng) << std::endl; 
    std::cout << "a random value == " << ceng(eng) << std::endl; 
 
    return (0); 
    } 
 
min == 1 max == 32768 a random value == 29681 a random value == 27362 a random value == 4162

Header: <random>

Namespace: std::tr1

Community Additions

ADD
Show:
© 2014 Microsoft