libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copyable.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_trivially_copyable
  12
  13 #include <type_traits>
  14 #include <cassert>
  15 #include "test_macros.h"
  16
  17 template <class T>
  18 void test_is_trivially_copyable()
  19 {
  20     static_assert( std::is_trivially_copyable<T>::value, "");
  21     static_assert( std::is_trivially_copyable<const T>::value, "");
  22     static_assert( std::is_trivially_copyable<volatile T>::value, "");
  23     static_assert( std::is_trivially_copyable<const volatile T>::value, "");
  24 #if TEST_STD_VER > 14
  25     static_assert( std::is_trivially_copyable_v<T>, "");
  26     static_assert( std::is_trivially_copyable_v<const T>, "");
  27     static_assert( std::is_trivially_copyable_v<volatile T>, "");
  28     static_assert( std::is_trivially_copyable_v<const volatile T>, "");
  29 #endif
  30 }
  31
  32 template <class T>
  33 void test_is_not_trivially_copyable()
  34 {
  35     static_assert(!std::is_trivially_copyable<T>::value, "");
  36     static_assert(!std::is_trivially_copyable<const T>::value, "");
  37     static_assert(!std::is_trivially_copyable<volatile T>::value, "");
  38     static_assert(!std::is_trivially_copyable<const volatile T>::value, "");
  39 #if TEST_STD_VER > 14
  40     static_assert(!std::is_trivially_copyable_v<T>, "");
  41     static_assert(!std::is_trivially_copyable_v<const T>, "");
  42     static_assert(!std::is_trivially_copyable_v<volatile T>, "");
  43     static_assert(!std::is_trivially_copyable_v<const volatile T>, "");
  44 #endif
  45 }
  46
  47 struct A
  48 {
  49     int i_;
  50 };
  51
  52 struct B
  53 {
  54     int i_;
  55     ~B() {assert(i_ == 0);}
  56 };
  57
  58 class C
  59 {
  60 public:
  61     C();
  62 };
  63
  64 int main(int, char**)
  65 {
  66     test_is_trivially_copyable<int> ();
  67     test_is_trivially_copyable<const int> ();
  68     test_is_trivially_copyable<A> ();
  69     test_is_trivially_copyable<const A> ();
  70     test_is_trivially_copyable<C> ();
  71
  72     test_is_not_trivially_copyable<int&> ();
  73     test_is_not_trivially_copyable<const A&> ();
  74     test_is_not_trivially_copyable<B> ();
  75
  76   return 0;
  77 }