# std::uniform_random_bit_generator

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< cpp‎ | numeric‎ | random

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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