std::uniform_random_bit_generator(3)

NAME
std::uniform_random_bit_generator - std::uniform_random_bit_generator

Synopsis
   Defined in header <random>
   template <class G>
   concept uniform_random_bit_generator =
   std::invocable<G&> &&
   std::unsigned_integral<std::invoke_result_t<G&>> &&
   requires { (since C++20)
   { 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;
   };
   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.