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0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008 
0009 #ifndef _LIBCPP___RANDOM_UNIFORM_RANDOM_BIT_GENERATOR_H
0010 #define _LIBCPP___RANDOM_UNIFORM_RANDOM_BIT_GENERATOR_H
0011 
0012 #include <__concepts/arithmetic.h>
0013 #include <__concepts/invocable.h>
0014 #include <__concepts/same_as.h>
0015 #include <__config>
0016 #include <__type_traits/integral_constant.h>
0017 #include <__type_traits/invoke.h>
0018 
0019 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0020 #  pragma GCC system_header
0021 #endif
0022 
0023 _LIBCPP_PUSH_MACROS
0024 #include <__undef_macros>
0025 
0026 _LIBCPP_BEGIN_NAMESPACE_STD
0027 
0028 #if _LIBCPP_STD_VER >= 20
0029 
0030 // [rand.req.urng]
0031 template <class _Gen>
0032 concept uniform_random_bit_generator = invocable<_Gen&> && unsigned_integral<invoke_result_t<_Gen&>> && requires {
0033   { _Gen::min() } -> same_as<invoke_result_t<_Gen&>>;
0034   { _Gen::max() } -> same_as<invoke_result_t<_Gen&>>;
0035   requires bool_constant<(_Gen::min() < _Gen::max())>::value;
0036 };
0037 
0038 #endif // _LIBCPP_STD_VER >= 20
0039 
0040 _LIBCPP_END_NAMESPACE_STD
0041 
0042 _LIBCPP_POP_MACROS
0043 
0044 #endif // _LIBCPP___RANDOM_UNIFORM_RANDOM_BIT_GENERATOR_H