libcxx/test/std/utilities/meta/meta.unary/meta.unary.comp/is_scalar.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 // type_traits
  10
  11 // is_scalar
  12
  13 #include <type_traits>
  14 #include <cstddef>         // for std::nullptr_t
  15 #include "test_macros.h"
  16
  17 template <class T>
  18 void test_is_scalar()
  19 {
  20     static_assert( std::is_scalar<T>::value, "");
  21     static_assert( std::is_scalar<const T>::value, "");
  22     static_assert( std::is_scalar<volatile T>::value, "");
  23     static_assert( std::is_scalar<const volatile T>::value, "");
  24 #if TEST_STD_VER > 14
  25     static_assert( std::is_scalar_v<T>, "");
  26     static_assert( std::is_scalar_v<const T>, "");
  27     static_assert( std::is_scalar_v<volatile T>, "");
  28     static_assert( std::is_scalar_v<const volatile T>, "");
  29 #endif
  30 }
  31
  32 template <class T>
  33 void test_is_not_scalar()
  34 {
  35     static_assert(!std::is_scalar<T>::value, "");
  36     static_assert(!std::is_scalar<const T>::value, "");
  37     static_assert(!std::is_scalar<volatile T>::value, "");
  38     static_assert(!std::is_scalar<const volatile T>::value, "");
  39 #if TEST_STD_VER > 14
  40     static_assert(!std::is_scalar_v<T>, "");
  41     static_assert(!std::is_scalar_v<const T>, "");
  42     static_assert(!std::is_scalar_v<volatile T>, "");
  43     static_assert(!std::is_scalar_v<const volatile T>, "");
  44 #endif
  45 }
  46
  47 class incomplete_type;
  48
  49 class Empty
  50 {
  51 };
  52
  53 class NotEmpty
  54 {
  55     virtual ~NotEmpty();
  56 };
  57
  58 union Union {};
  59
  60 struct bit_zero
  61 {
  62     int :  0;
  63 };
  64
  65 class Abstract
  66 {
  67     virtual ~Abstract() = 0;
  68 };
  69
  70 enum Enum {zero, one};
  71
  72 typedef void (*FunctionPtr)();
  73
  74
  75 int main(int, char**)
  76 {
  77 //  Arithmetic types (3.9.1), enumeration types, pointer types, pointer to member types (3.9.2),
  78 //    std::nullptr_t, and cv-qualified versions of these types (3.9.3)
  79 //    are collectively called scalar types.
  80
  81     test_is_scalar<std::nullptr_t>();
  82     test_is_scalar<short>();
  83     test_is_scalar<unsigned short>();
  84     test_is_scalar<int>();
  85     test_is_scalar<unsigned int>();
  86     test_is_scalar<long>();
  87     test_is_scalar<unsigned long>();
  88     test_is_scalar<bool>();
  89     test_is_scalar<char>();
  90     test_is_scalar<signed char>();
  91     test_is_scalar<unsigned char>();
  92     test_is_scalar<wchar_t>();
  93     test_is_scalar<double>();
  94     test_is_scalar<int*>();
  95     test_is_scalar<const int*>();
  96     test_is_scalar<int Empty::*>();
  97     test_is_scalar<void (Empty::*)(int)>();
  98     test_is_scalar<Enum>();
  99     test_is_scalar<FunctionPtr>();
 100
 101     test_is_not_scalar<void>();
 102     test_is_not_scalar<int&>();
 103     test_is_not_scalar<int&&>();
 104     test_is_not_scalar<char[3]>();
 105     test_is_not_scalar<char[]>();
 106     test_is_not_scalar<Union>();
 107     test_is_not_scalar<Empty>();
 108     test_is_not_scalar<incomplete_type>();
 109     test_is_not_scalar<bit_zero>();
 110     test_is_not_scalar<NotEmpty>();
 111     test_is_not_scalar<Abstract>();
 112     test_is_not_scalar<int(int)>();
 113
 114   return 0;
 115 }