libstdc++-v3/testsuite/20_util/tuple/creation_functions/constexpr.cc

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2011-2023 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20
  21 // NOTE: This makes use of the fact that we know how moveable
  22 // is implemented on pair, and also vector. If the implementation
  23 // changes this test may begin to fail.
  24
  25 #include <tuple>
  26
  27 // make_tuple
  28 void
  29 test_make_tuple()
  30 {
  31   {
  32     typedef std::tuple<int, float> tuple_type;
  33     constexpr tuple_type p1 __attribute__((unused))
  34       = std::make_tuple(22, 22.222);
  35   }
  36
  37   {
  38     typedef std::tuple<int, float, int> tuple_type;
  39     constexpr tuple_type p1 __attribute__((unused))
  40       = std::make_tuple(22, 22.222, 77799);
  41   }
  42 }
  43
  44 // forward_as_tuple
  45 void
  46 test_forward_as_tuple()
  47 {
  48   {
  49     static int i(22);
  50     static float f(22.222);
  51     typedef std::tuple<int&, float&&> tuple_type;
  52     constexpr tuple_type p1 __attribute__((unused))
  53       = std::forward_as_tuple(i, std::move(f));
  54   }
  55
  56   {
  57     static int i(22);
  58     static float f(22.222);
  59     static int ii(77799);
  60
  61     typedef std::tuple<int&, float&, int&&> tuple_type;
  62     constexpr tuple_type p1 __attribute__((unused))
  63       = std::forward_as_tuple(i, f, std::move(ii));
  64   }
  65 }
  66
  67 // tie
  68 void
  69 test_tie()
  70 {
  71   {
  72     static int i(22);
  73     static float f(22.222);
  74     typedef std::tuple<int&, float&> tuple_type;
  75     constexpr tuple_type p1 __attribute__((unused))
  76       = std::tie(i, f);
  77   }
  78
  79   {
  80     static int i(22);
  81     static float f(22.222);
  82     static const int ii(77799);
  83
  84     typedef std::tuple<int&, float&, const int&> tuple_type;
  85     constexpr tuple_type p1 __attribute__((unused))
  86       = std::tie(i, f, ii);
  87   }
  88 }
  89
  90 // get
  91 void
  92 test_get()
  93 {
  94   {
  95     typedef std::tuple<int, float> tuple_type;
  96     constexpr tuple_type t1 { 55, 77.77 };
  97     constexpr auto var __attribute__((unused))
  98       = std::get<1>(t1);
  99   }
 100
 101   {
 102     typedef std::tuple<int, float, int> tuple_type;
 103     constexpr tuple_type t1 { 55, 77.77, 99 };
 104     constexpr auto var __attribute__((unused))
 105       = std::get<2>(t1);
 106   }
 107 }
 108
 109 // tuple_cat
 110 void
 111 test_tuple_cat()
 112 {
 113   typedef std::tuple<int, float>        tuple_type1;
 114   typedef std::tuple<int, int, float> tuple_type2;
 115
 116   constexpr tuple_type1 t1 { 55, 77.77 };
 117   constexpr tuple_type2 t2 { 55, 99, 77.77 };
 118   constexpr auto cat1 __attribute__((unused)) = std::tuple_cat(t1, t2);
 119 }
 120
 121 namespace {
 122
 123 template<class T>
 124 constexpr int zero_from_anything(T)
 125 {
 126   return 0;
 127 }
 128
 129 }
 130
 131 // ignore, see LWG 2773
 132 void
 133 test_ignore()
 134 {
 135   constexpr auto ign1 __attribute__((unused)) = std::ignore;
 136   constexpr auto ign2 __attribute__((unused)) = std::make_tuple(std::ignore);
 137   constexpr int ign3 __attribute__((unused)) = zero_from_anything(std::ignore);
 138 }
 139
 140 int
 141 main()
 142 {
 143   test_make_tuple();
 144   test_forward_as_tuple();
 145   test_tie();
 146   test_get();
 147   test_tuple_cat();
 148   test_ignore();
 149
 150   return 0;
 151 }