libstdc++-v3/testsuite/24_iterators/container_access.cc

   1 // { dg-do run { target c++17 } }
   2
   3 // Copyright (C) 2015-2022 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 // 24.8, container access [iterator.container]
  21
  22 #include <iterator>
  23 #include <vector>
  24 #include <testsuite_hooks.h>
  25
  26 void
  27 test01()
  28 {
  29   int i[42];
  30   VERIFY(std::data(i) == i);
  31   VERIFY(std::size(i) == 42);
  32   VERIFY(!std::empty(i));
  33 }
  34
  35 void
  36 test02()
  37 {
  38   static constexpr int i[42]{};
  39   constexpr auto d = std::data(i);
  40   static_assert(d == i);
  41   constexpr auto s = std::size(i);
  42   static_assert(s == 42);
  43   constexpr auto e = std::empty(i);
  44   static_assert(!e);
  45 }
  46
  47 void
  48 test03()
  49 {
  50   std::initializer_list<int> il{1,2,3};
  51   VERIFY(std::data(il) == il.begin());
  52   VERIFY(std::size(il) == 3);
  53   VERIFY(!std::empty(il));
  54   std::initializer_list<int> il2{};
  55   VERIFY(std::size(il2) == 0);
  56   VERIFY(std::empty(il2));
  57   static constexpr std::initializer_list<int> il3{1,2,3};
  58   constexpr auto d = std::data(il3);
  59   static_assert(d == il3.begin());
  60   constexpr auto s = std::size(il3);
  61   static_assert(s == 3);
  62   constexpr auto e = std::empty(il3);
  63   static_assert(!e);
  64 }
  65
  66 void
  67 test04()
  68 {
  69   std::vector<int> v{1,2,3};
  70   VERIFY(std::data(v) == v.data());
  71   VERIFY(std::size(v) == v.size());
  72   VERIFY(!std::empty(v));
  73   std::vector<int> v2{};
  74   VERIFY(std::size(v2) == v2.size());
  75   VERIFY(std::empty(v2));
  76 }
  77
  78 int
  79 main()
  80 {
  81   test01();
  82   test02();
  83   test03();
  84   test04();
  85 }