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std::generate_canonical - cppreference.com

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

Generates a random floating point number in range [â0â, 1).

To generate enough entropy, generate_canonical() will call g() exactly \(\small k\)k times, where \(\small k = \max(1, \lceil \frac{b}{\log_2 R} \rceil)\)k = max(1, â b / log2 R â) and

b = std::min(Bits, std::size_t {std::numeric_limits<RealType>::digits}),
R = g.max() - g.min() + 1.

[edit] Parameters g - generator to use to acquire entropy [edit] Return value

Floating point value in range [â0â, 1).

[edit] Exceptions

None except from those thrown by g.

[edit] 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.

[edit] Example

Produce random numbers with 10 bits of randomness: this may produce only k * R distinct values.

Possible output:

0.208143 0.824147 0.0278604 0.343183 0.0173263 0.864057 0.647037 0.539467 0.0583497 0.609219

[edit] See also

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