libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_copy_assignable.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_copy_assignable
  12
  13 #include <type_traits>
  14 #include "test_macros.h"
  15
  16 template <class T>
  17 void test_is_copy_assignable()
  18 {
  19     static_assert(( std::is_copy_assignable<T>::value), "");
  20 #if TEST_STD_VER > 14
  21     static_assert(( std::is_copy_assignable_v<T>), "");
  22 #endif
  23 }
  24
  25 template <class T>
  26 void test_is_not_copy_assignable()
  27 {
  28     static_assert((!std::is_copy_assignable<T>::value), "");
  29 #if TEST_STD_VER > 14
  30     static_assert((!std::is_copy_assignable_v<T>), "");
  31 #endif
  32 }
  33
  34 class Empty
  35 {
  36 };
  37
  38 class NotEmpty
  39 {
  40 public:
  41     virtual ~NotEmpty();
  42 };
  43
  44 union Union {};
  45
  46 struct bit_zero
  47 {
  48     int :  0;
  49 };
  50
  51 struct A
  52 {
  53     A();
  54 };
  55
  56 class B
  57 {
  58     B& operator=(const B&);
  59 };
  60
  61 struct C
  62 {
  63     void operator=(C&);  // not const
  64 };
  65
  66 int main(int, char**)
  67 {
  68     test_is_copy_assignable<int> ();
  69     test_is_copy_assignable<int&> ();
  70     test_is_copy_assignable<A> ();
  71     test_is_copy_assignable<bit_zero> ();
  72     test_is_copy_assignable<Union> ();
  73     test_is_copy_assignable<NotEmpty> ();
  74     test_is_copy_assignable<Empty> ();
  75
  76 #if TEST_STD_VER >= 11
  77     test_is_not_copy_assignable<const int> ();
  78     test_is_not_copy_assignable<int[]> ();
  79     test_is_not_copy_assignable<int[3]> ();
  80     test_is_not_copy_assignable<B> ();
  81 #endif
  82     test_is_not_copy_assignable<void> ();
  83     test_is_not_copy_assignable<C> ();
  84
  85   return 0;
  86 }