1//===----------------------------------------------------------------------===//
 2//
 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 4// See https://llvm.org/LICENSE.txt for license information.
 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 6//
 7//===----------------------------------------------------------------------===//
 8
 9#ifndef _LIBCPP___RANDOM_UNIFORM_RANDOM_BIT_GENERATOR_H
10#define _LIBCPP___RANDOM_UNIFORM_RANDOM_BIT_GENERATOR_H
11
12#include <__concepts/arithmetic.h>
13#include <__concepts/invocable.h>
14#include <__concepts/same_as.h>
15#include <__config>
16#include <__type_traits/integral_constant.h>
17#include <__type_traits/invoke.h>
18
19#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
20#  pragma GCC system_header
21#endif
22
23_LIBCPP_PUSH_MACROS
24#include <__undef_macros>
25
26_LIBCPP_BEGIN_NAMESPACE_STD
27
28#if _LIBCPP_STD_VER >= 20
29
30// [rand.req.urng]
31template <class _Gen>
32concept uniform_random_bit_generator = invocable<_Gen&> && unsigned_integral<invoke_result_t<_Gen&>> && requires {
33  { _Gen::min() } -> same_as<invoke_result_t<_Gen&>>;
34  { _Gen::max() } -> same_as<invoke_result_t<_Gen&>>;
35  requires bool_constant<(_Gen::min() < _Gen::max())>::value;
36};
37
38#endif // _LIBCPP_STD_VER >= 20
39
40_LIBCPP_END_NAMESPACE_STD
41
42_LIBCPP_POP_MACROS
43
44#endif // _LIBCPP___RANDOM_UNIFORM_RANDOM_BIT_GENERATOR_H