std::UniformRandomBitGenerator

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C library

rand

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RAND_MAX

Defined in header <random>
template <class G> concept UniformRandomBitGenerator = std::Invocable<G&> && std::UnsignedIntegral<std::invoke_result_t<G&>> && requires { G::min(); requires std::Same<decltype(G::min()), std::invoke_result_t<G&>>; G::max(); requires std::Same<decltype(G::max()), std::invoke_result_t<G&>>; };		(since C++20)

The concept UniformRandomBitGenerator <G> specifies that G is the type of a uniform random bit generator, that is, objects of type G is a function object returning unsigned integer values such that each value in the range of possible results has (ideally) equal probability of being returned.

UniformRandomBitGenerator<G> is satisfied only if, given any object g of type G:

• G::min() and G::max() are constant expressions;
• G::min() < G::max()
• g() is in the range [G::min(), G::max()]
• g() has amortized constant complexity.