std::generate_canonical

Since C++11

Header: <random>

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

# Declarations

template< class RealType, std::size_t Bits, class Generator >
RealType generate_canonical( Generator& g );

(since C++11)

# Parameters

# Return value

Floating point value in range [0,1).

# Notes

Some existing implementations have a bug where they may occasionally return 1.0 if RealType is float GCC #63176 LLVM #18767 MSVC STL #1074. This is LWG issue 2524.

# Example

#include <iostream>
#include <random>
 
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) << ' ';
    std::cout << '\n';
}

# See also