libcxx/test/std/concepts/concepts.lang/concepts.arithmetic/signed_integral.pass.cpp

   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 // UNSUPPORTED: c++03, c++11, c++14, c++17
  10
  11 // template<class T>
  12 // concept signed_integral = // see below
  13
  14 #include <concepts>
  15 #include <type_traits>
  16
  17 #include "arithmetic.h"
  18 #include "test_macros.h"
  19
  20 template <typename T>
  21 constexpr bool CheckSignedIntegralQualifiers() {
  22   constexpr bool result = std::signed_integral<T>;
  23   static_assert(std::signed_integral<const T> == result);
  24   static_assert(std::signed_integral<volatile T> == result);
  25   static_assert(std::signed_integral<const volatile T> == result);
  26
  27   static_assert(!std::signed_integral<T&>);
  28   static_assert(!std::signed_integral<const T&>);
  29   static_assert(!std::signed_integral<volatile T&>);
  30   static_assert(!std::signed_integral<const volatile T&>);
  31
  32   static_assert(!std::signed_integral<T&&>);
  33   static_assert(!std::signed_integral<const T&&>);
  34   static_assert(!std::signed_integral<volatile T&&>);
  35   static_assert(!std::signed_integral<const volatile T&&>);
  36
  37   static_assert(!std::signed_integral<T*>);
  38   static_assert(!std::signed_integral<const T*>);
  39   static_assert(!std::signed_integral<volatile T*>);
  40   static_assert(!std::signed_integral<const volatile T*>);
  41
  42   static_assert(!std::signed_integral<T (*)()>);
  43   static_assert(!std::signed_integral<T (&)()>);
  44   static_assert(!std::signed_integral<T(&&)()>);
  45
  46   return result;
  47 }
  48
  49 // standard signed integers
  50 static_assert(CheckSignedIntegralQualifiers<signed char>());
  51 static_assert(CheckSignedIntegralQualifiers<short>());
  52 static_assert(CheckSignedIntegralQualifiers<int>());
  53 static_assert(CheckSignedIntegralQualifiers<long>());
  54 static_assert(CheckSignedIntegralQualifiers<long long>());
  55
  56 // bool and character *may* be signed
  57 static_assert(CheckSignedIntegralQualifiers<wchar_t>() ==
  58               std::is_signed_v<wchar_t>);
  59 static_assert(CheckSignedIntegralQualifiers<bool>() == std::is_signed_v<bool>);
  60 static_assert(CheckSignedIntegralQualifiers<char>() == std::is_signed_v<char>);
  61 static_assert(CheckSignedIntegralQualifiers<char8_t>() ==
  62               std::is_signed_v<char8_t>);
  63 static_assert(CheckSignedIntegralQualifiers<char16_t>() ==
  64               std::is_signed_v<char16_t>);
  65 static_assert(CheckSignedIntegralQualifiers<char32_t>() ==
  66               std::is_signed_v<char32_t>);
  67
  68 // integers that aren't signed integrals
  69 static_assert(!CheckSignedIntegralQualifiers<unsigned char>());
  70 static_assert(!CheckSignedIntegralQualifiers<unsigned short>());
  71 static_assert(!CheckSignedIntegralQualifiers<unsigned int>());
  72 static_assert(!CheckSignedIntegralQualifiers<unsigned long>());
  73 static_assert(!CheckSignedIntegralQualifiers<unsigned long long>());
  74
  75 // extended integers
  76 #ifndef TEST_HAS_NO_INT128
  77 static_assert(CheckSignedIntegralQualifiers<__int128_t>());
  78 static_assert(!CheckSignedIntegralQualifiers<__uint128_t>());
  79 #endif
  80
  81 // types that aren't even integers shouldn't be signed integers!
  82 static_assert(!std::signed_integral<void>);
  83 static_assert(!CheckSignedIntegralQualifiers<float>());
  84 static_assert(!CheckSignedIntegralQualifiers<double>());
  85 static_assert(!CheckSignedIntegralQualifiers<long double>());
  86
  87 static_assert(!CheckSignedIntegralQualifiers<ClassicEnum>());
  88 static_assert(!CheckSignedIntegralQualifiers<ScopedEnum>());
  89 static_assert(!CheckSignedIntegralQualifiers<EmptyStruct>());
  90 static_assert(!CheckSignedIntegralQualifiers<int EmptyStruct::*>());
  91 static_assert(!CheckSignedIntegralQualifiers<int (EmptyStruct::*)()>());
  92
  93 static_assert(CheckSubsumption(0));
  94 static_assert(CheckSubsumption(0U));
  95
  96 int main(int, char**) { return 0; }