libcxx/include/__utility/cmp.h

   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___UTILITY_CMP_H
  10 #define _LIBCPP___UTILITY_CMP_H
  11
  12 #include <__concepts/arithmetic.h>
  13 #include <__config>
  14 #include <__type_traits/is_signed.h>
  15 #include <__type_traits/make_unsigned.h>
  16 #include <limits>
  17
  18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  19 #  pragma GCC system_header
  20 #endif
  21
  22 _LIBCPP_PUSH_MACROS
  23 #include <__undef_macros>
  24
  25 _LIBCPP_BEGIN_NAMESPACE_STD
  26
  27 #if _LIBCPP_STD_VER >= 20
  28
  29 template <__libcpp_integer _Tp, __libcpp_integer _Up>
  30 _LIBCPP_HIDE_FROM_ABI constexpr bool cmp_equal(_Tp __t, _Up __u) noexcept {
  31   if constexpr (is_signed_v<_Tp> == is_signed_v<_Up>)
  32     return __t == __u;
  33   else if constexpr (is_signed_v<_Tp>)
  34     return __t < 0 ? false : make_unsigned_t<_Tp>(__t) == __u;
  35   else
  36     return __u < 0 ? false : __t == make_unsigned_t<_Up>(__u);
  37 }
  38
  39 template <__libcpp_integer _Tp, __libcpp_integer _Up>
  40 _LIBCPP_HIDE_FROM_ABI constexpr bool cmp_not_equal(_Tp __t, _Up __u) noexcept {
  41   return !std::cmp_equal(__t, __u);
  42 }
  43
  44 template <__libcpp_integer _Tp, __libcpp_integer _Up>
  45 _LIBCPP_HIDE_FROM_ABI constexpr bool cmp_less(_Tp __t, _Up __u) noexcept {
  46   if constexpr (is_signed_v<_Tp> == is_signed_v<_Up>)
  47     return __t < __u;
  48   else if constexpr (is_signed_v<_Tp>)
  49     return __t < 0 ? true : make_unsigned_t<_Tp>(__t) < __u;
  50   else
  51     return __u < 0 ? false : __t < make_unsigned_t<_Up>(__u);
  52 }
  53
  54 template <__libcpp_integer _Tp, __libcpp_integer _Up>
  55 _LIBCPP_HIDE_FROM_ABI constexpr bool cmp_greater(_Tp __t, _Up __u) noexcept {
  56   return std::cmp_less(__u, __t);
  57 }
  58
  59 template <__libcpp_integer _Tp, __libcpp_integer _Up>
  60 _LIBCPP_HIDE_FROM_ABI constexpr bool cmp_less_equal(_Tp __t, _Up __u) noexcept {
  61   return !std::cmp_greater(__t, __u);
  62 }
  63
  64 template <__libcpp_integer _Tp, __libcpp_integer _Up>
  65 _LIBCPP_HIDE_FROM_ABI constexpr bool cmp_greater_equal(_Tp __t, _Up __u) noexcept {
  66   return !std::cmp_less(__t, __u);
  67 }
  68
  69 template <__libcpp_integer _Tp, __libcpp_integer _Up>
  70 _LIBCPP_HIDE_FROM_ABI constexpr bool in_range(_Up __u) noexcept {
  71   return std::cmp_less_equal(__u, numeric_limits<_Tp>::max()) &&
  72          std::cmp_greater_equal(__u, numeric_limits<_Tp>::min());
  73 }
  74
  75 #endif // _LIBCPP_STD_VER >= 20
  76
  77 _LIBCPP_END_NAMESPACE_STD
  78
  79 _LIBCPP_POP_MACROS
  80
  81 #endif // _LIBCPP___UTILITY_CMP_H