libstdc++-v3/testsuite/20_util/has_unique_object_representations/value.cc

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do compile { target c++17 } }
   3
   4 // Copyright (C) 2016-2019 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11 //
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <type_traits>
  22 #include <testsuite_tr1.h>
  23
  24 void test01()
  25 {
  26   using std::has_unique_object_representations;
  27   using __gnu_test::test_category;
  28
  29   // Positive tests.
  30   static_assert(test_category<has_unique_object_representations,
  31                 char>(true), "");
  32   static_assert(test_category<has_unique_object_representations,
  33                 unsigned char>(true), "");
  34   static_assert(test_category<has_unique_object_representations,
  35                 signed char>(true), "");
  36   static_assert(test_category<has_unique_object_representations,
  37                 unsigned>(true), "");
  38   static_assert(test_category<has_unique_object_representations,
  39                 bool>(true), "");
  40
  41   enum E : unsigned { };
  42   static_assert(test_category<has_unique_object_representations,
  43                 E>(true), "");
  44
  45   static_assert(test_category<has_unique_object_representations,
  46                 unsigned[3]>(true), "");
  47   static_assert(test_category<has_unique_object_representations,
  48                 unsigned[3][2]>(true), "");
  49   static_assert(test_category<has_unique_object_representations,
  50                 unsigned[]>(true), "");
  51   static_assert(test_category<has_unique_object_representations,
  52                 unsigned[][2]>(true), "");
  53   static_assert(test_category<has_unique_object_representations,
  54                 E[3]>(true), "");
  55   static_assert(test_category<has_unique_object_representations,
  56                 E[3][2]>(true), "");
  57   static_assert(test_category<has_unique_object_representations,
  58                 E[]>(true), "");
  59   static_assert(test_category<has_unique_object_representations,
  60                 E[][2]>(true), "");
  61
  62   struct Padded {
  63     char c1;
  64     alignas(4) char c2;
  65   };
  66
  67   struct Bitfield {
  68     int i : 3;
  69   };
  70
  71   struct Aligned {
  72     alignas(4) char c;
  73   };
  74
  75   // Negative tests.
  76   static_assert(test_category<has_unique_object_representations,
  77                 void>(false), "");
  78   static_assert(test_category<has_unique_object_representations,
  79                 float>(false), ""); // implementation-defined
  80   static_assert(test_category<has_unique_object_representations,
  81                 Padded>(false), "");
  82   static_assert(test_category<has_unique_object_representations,
  83                 Padded[2]>(false), "");
  84   static_assert(test_category<has_unique_object_representations,
  85                 Padded[2][1]>(false), "");
  86   static_assert(test_category<has_unique_object_representations,
  87                 Padded[]>(false), "");
  88   static_assert(test_category<has_unique_object_representations,
  89                 Padded[][1]>(false), "");
  90   static_assert(test_category<has_unique_object_representations,
  91                 Bitfield>(false), "");
  92   static_assert(test_category<has_unique_object_representations,
  93                 Bitfield[2]>(false), "");
  94   static_assert(test_category<has_unique_object_representations,
  95                 Bitfield[2][1]>(false), "");
  96   static_assert(test_category<has_unique_object_representations,
  97                 Bitfield[]>(false), "");
  98   static_assert(test_category<has_unique_object_representations,
  99                 Bitfield[][1]>(false), "");
 100   static_assert(test_category<has_unique_object_representations,
 101                 Aligned>(false), "");
 102   static_assert(test_category<has_unique_object_representations,
 103                 Aligned[2]>(false), "");
 104   static_assert(test_category<has_unique_object_representations,
 105                 Aligned[2][1]>(false), "");
 106   static_assert(test_category<has_unique_object_representations,
 107                 Aligned[]>(false), "");
 108   static_assert(test_category<has_unique_object_representations,
 109                 Aligned[][1]>(false), "");
 110 }
 111
 112 void
 113 test02()
 114 {
 115   using std::has_unique_object_representations;
 116   using std::has_unique_object_representations_v;
 117
 118   static_assert(has_unique_object_representations_v<int>
 119                 == has_unique_object_representations<int>::value);
 120   static_assert(has_unique_object_representations_v<void>
 121                 == has_unique_object_representations<void>::value);
 122   static_assert(has_unique_object_representations_v<float>
 123                 == has_unique_object_representations<float>::value);
 124 }