libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_abstract.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_abstract
  12
  13 #include <type_traits>
  14 #include "test_macros.h"
  15
  16 template <class T>
  17 void test_is_abstract()
  18 {
  19     static_assert( std::is_abstract<T>::value, "");
  20     static_assert( std::is_abstract<const T>::value, "");
  21     static_assert( std::is_abstract<volatile T>::value, "");
  22     static_assert( std::is_abstract<const volatile T>::value, "");
  23 #if TEST_STD_VER > 14
  24     static_assert( std::is_abstract_v<T>, "");
  25     static_assert( std::is_abstract_v<const T>, "");
  26     static_assert( std::is_abstract_v<volatile T>, "");
  27     static_assert( std::is_abstract_v<const volatile T>, "");
  28 #endif
  29 }
  30
  31 template <class T>
  32 void test_is_not_abstract()
  33 {
  34     static_assert(!std::is_abstract<T>::value, "");
  35     static_assert(!std::is_abstract<const T>::value, "");
  36     static_assert(!std::is_abstract<volatile T>::value, "");
  37     static_assert(!std::is_abstract<const volatile T>::value, "");
  38 #if TEST_STD_VER > 14
  39     static_assert(!std::is_abstract_v<T>, "");
  40     static_assert(!std::is_abstract_v<const T>, "");
  41     static_assert(!std::is_abstract_v<volatile T>, "");
  42     static_assert(!std::is_abstract_v<const volatile T>, "");
  43 #endif
  44 }
  45
  46 class Empty
  47 {
  48 };
  49
  50 class NotEmpty
  51 {
  52     virtual ~NotEmpty();
  53 };
  54
  55 union Union {};
  56
  57 struct bit_zero
  58 {
  59     int :  0;
  60 };
  61
  62 class Abstract
  63 {
  64     virtual ~Abstract() = 0;
  65 };
  66
  67 template <class>
  68 struct AbstractTemplate {
  69   virtual void test() = 0;
  70 };
  71
  72 template <>
  73 struct AbstractTemplate<double> {};
  74
  75 int main(int, char**)
  76 {
  77     test_is_not_abstract<void>();
  78     test_is_not_abstract<int&>();
  79     test_is_not_abstract<int>();
  80     test_is_not_abstract<double>();
  81     test_is_not_abstract<int*>();
  82     test_is_not_abstract<const int*>();
  83     test_is_not_abstract<char[3]>();
  84     test_is_not_abstract<char[]>();
  85     test_is_not_abstract<Union>();
  86     test_is_not_abstract<Empty>();
  87     test_is_not_abstract<bit_zero>();
  88     test_is_not_abstract<NotEmpty>();
  89
  90     test_is_abstract<Abstract>();
  91     test_is_abstract<AbstractTemplate<int> >();
  92     test_is_not_abstract<AbstractTemplate<double> >();
  93
  94   return 0;
  95 }