libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_aggregate.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
  10
  11 // <type_traits>
  12
  13 // template <class T> struct is_aggregate;
  14 // template <class T> constexpr bool is_aggregate_v = is_aggregate<T>::value;
  15
  16 #include <type_traits>
  17 #include "test_macros.h"
  18
  19 template <class T>
  20 void test_true()
  21 {
  22     static_assert( std::is_aggregate<T>::value, "");
  23     static_assert( std::is_aggregate<const T>::value, "");
  24     static_assert( std::is_aggregate<volatile T>::value, "");
  25     static_assert( std::is_aggregate<const volatile T>::value, "");
  26     static_assert( std::is_aggregate_v<T>, "");
  27     static_assert( std::is_aggregate_v<const T>, "");
  28     static_assert( std::is_aggregate_v<volatile T>, "");
  29     static_assert( std::is_aggregate_v<const volatile T>, "");
  30 }
  31
  32 template <class T>
  33 void test_false()
  34 {
  35     static_assert(!std::is_aggregate<T>::value, "");
  36     static_assert(!std::is_aggregate<const T>::value, "");
  37     static_assert(!std::is_aggregate<volatile T>::value, "");
  38     static_assert(!std::is_aggregate<const volatile T>::value, "");
  39     static_assert(!std::is_aggregate_v<T>, "");
  40     static_assert(!std::is_aggregate_v<const T>, "");
  41     static_assert(!std::is_aggregate_v<volatile T>, "");
  42     static_assert(!std::is_aggregate_v<const volatile T>, "");
  43 }
  44
  45 struct Aggregate {};
  46 struct HasCons { HasCons(int); };
  47 struct HasPriv {
  48   void PreventUnusedPrivateMemberWarning();
  49 private:
  50   int x;
  51 };
  52 struct Union { int x; void* y; };
  53
  54
  55 int main(int, char**)
  56 {
  57   {
  58     test_false<void>();
  59     test_false<int>();
  60     test_false<void*>();
  61     test_false<void()>();
  62     test_false<void() const>();
  63     test_false<void(Aggregate::*)(int) const>();
  64     test_false<Aggregate&>();
  65     test_false<HasCons>();
  66     test_false<HasPriv>();
  67   }
  68   {
  69     test_true<Aggregate>();
  70     test_true<Aggregate[]>();
  71     test_true<Aggregate[42][101]>();
  72     test_true<Union>();
  73   }
  74
  75   return 0;
  76 }