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

   1 // { dg-do run }
   2 // { dg-options "-std=gnu++17" }
   3
   4 // Copyright (C) 2015-2017 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 // 24.8, container access [iterator.container]
  22
  23 #include <iterator>
  24 #include <vector>
  25 #include <testsuite_hooks.h>
  26
  27 void
  28 test01()
  29 {
  30   int i[42];
  31   VERIFY(std::data(i) == i);
  32   VERIFY(std::size(i) == 42);
  33   VERIFY(!std::empty(i));
  34 }
  35
  36 void
  37 test02()
  38 {
  39   static constexpr int i[42]{};
  40   constexpr auto d = std::data(i);
  41   static_assert(d == i);
  42   constexpr auto s = std::size(i);
  43   static_assert(s == 42);
  44   constexpr auto e = std::empty(i);
  45   static_assert(!e);
  46 }
  47
  48 void
  49 test03()
  50 {
  51   std::initializer_list<int> il{1,2,3};
  52   VERIFY(std::data(il) == il.begin());
  53   VERIFY(std::size(il) == 3);
  54   VERIFY(!std::empty(il));
  55   std::initializer_list<int> il2{};
  56   VERIFY(std::size(il2) == 0);
  57   VERIFY(std::empty(il2));
  58   static constexpr std::initializer_list<int> il3{1,2,3};
  59   constexpr auto d = std::data(il3);
  60   static_assert(d == il3.begin());
  61   constexpr auto s = std::size(il3);
  62   static_assert(s == 3);
  63   constexpr auto e = std::empty(il3);
  64   static_assert(!e);
  65
  66 }
  67
  68 void
  69 test04()
  70 {
  71   std::vector<int> v{1,2,3};
  72   VERIFY(std::data(v) == v.data());
  73   VERIFY(std::size(v) == v.size());
  74   VERIFY(!std::empty(v));
  75   std::vector<int> v2{};
  76   VERIFY(std::size(v2) == v2.size());
  77   VERIFY(std::empty(v2));
  78 }
  79
  80 int
  81 main()
  82 {
  83   test01();
  84   test02();
  85   test03();
  86   test04();
  87 }