std:: uniform_random_bit_generator

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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 .

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