std::uniform_random_bit_generator

 

C++

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C library

rand

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RAND_MAX

 

Defined in header <random>
template< class G > concept uniform_random_bit_generator =     std::invocable<G&> && std::unsigned_integral<std::invoke_result_t<G&>> &&     requires {         { G::min() } -> std::same_as<std::invoke_result_t<G&>>;         { G::max() } -> std::same_as<std::invoke_result_t<G&>>;         requires std::bool_constant<(G::min() < G::max())>::value;     };		(since C++20)

The concept uniform_random_bit_generator<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.

Semantic requirements

uniform_random_bit_generator<G> is modeled only if, given any object g of type G:

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

Notes

In order to satisfy the requirement std::bool_constant<(G::min() < G::max())>::value, both G::min() and G::max() must be constant expressions, and the result of the comparison must be true.