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std::generate_canonical

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< cpp‎ | numeric‎ | random
Revision as of 20:11, 2 November 2012 by P12bot (Talk | contribs)

 
 
 
 
template< class RealType, size_t bits, class Generator >
RealType generate_canonical( Generator& g );
(since C++11)

Generates a random floating point number in range [0; 1).

g() is called as many times as needed to generate enough entropy, i.e. at least max(1, ⌈ min(b
1
, b
2
) / log
2
R ⌉)
times, where

Contents

Parameters

g - generator to use to acquire entropy

Return value

Floating point value in range [0; 1).

Exceptions

None except from those thrown by g

Example

produce random numbers with 10 bits of randomness: this may produce only 1024 distinct values

#include <random>
#include <iostream>
 
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
    for(int n=0; n<10; ++n) {
        std::cout << std::generate_canonical<double, 10>(gen) << ' ';
    }
}

Output:

0.208143 0.824147 0.0278604 0.343183 0.0173263 0.864057 0.647037 0.539467 0.0583497 0.609219

See also

Template:cpp/numeric/random/dcl list uniform real distribution