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

   1 // { dg-do run }
   2 // { dg-options "-std=gnu++17" }
   3
   4 // Copyright (C) 2015-2016 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 bool test __attribute__((unused)) = true;
  28
  29 void
  30 test01()
  31 {
  32   int i[42];
  33   VERIFY(std::data(i) == i);
  34   VERIFY(std::size(i) == 42);
  35   VERIFY(!std::empty(i));
  36 }
  37
  38 void
  39 test02()
  40 {
  41   static constexpr int i[42]{};
  42   constexpr auto d = std::data(i);
  43   static_assert(d == i);
  44   constexpr auto s = std::size(i);
  45   static_assert(s == 42);
  46   constexpr auto e = std::empty(i);
  47   static_assert(!e);
  48 }
  49
  50 void
  51 test03()
  52 {
  53   std::initializer_list<int> il{1,2,3};
  54   VERIFY(std::data(il) == il.begin());
  55   VERIFY(std::size(il) == 3);
  56   VERIFY(!std::empty(il));
  57   std::initializer_list<int> il2{};
  58   VERIFY(std::size(il2) == 0);
  59   VERIFY(std::empty(il2));
  60   constexpr std::initializer_list<int> il3{1,2,3};
  61   constexpr auto d = std::data(il3);
  62   static_assert(d == il3.begin());
  63   constexpr auto s = std::size(il3);
  64   static_assert(s == 3);
  65   constexpr auto e = std::empty(il3);
  66   static_assert(!e);
  67
  68 }
  69
  70 void
  71 test04()
  72 {
  73   std::vector<int> v{1,2,3};
  74   VERIFY(std::data(v) == v.data());
  75   VERIFY(std::size(v) == v.size());
  76   VERIFY(!std::empty(v));
  77   std::vector<int> v2{};
  78   VERIFY(std::size(v2) == v2.size());
  79   VERIFY(std::empty(v2));
  80 }
  81
  82 int
  83 main()
  84 {
  85   test01();
  86   test02();
  87   test03();
  88   test04();
  89 }