libstdc++-v3/testsuite/25_algorithms/shift_left/1.cc

   1 // Copyright (C) 2020-2025 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do run { target c++20 } }
  19
  20 #include <algorithm>
  21 #include <testsuite_hooks.h>
  22 #include <testsuite_iterators.h>
  23
  24 using __gnu_test::test_container;
  25 using __gnu_test::forward_iterator_wrapper;
  26 using __gnu_test::bidirectional_iterator_wrapper;
  27 using __gnu_test::random_access_iterator_wrapper;
  28
  29 struct X
  30 {
  31   int a = -1;
  32   bool moved_from = false;
  33
  34   X() = default;
  35
  36   X(int a)
  37     : a(a)
  38   { }
  39
  40   X(const X&) = delete;
  41   X& operator=(const X&) = delete;
  42
  43   X(X&& other)
  44   {
  45     if (this != &other)
  46     *this = std::move(other);
  47   }
  48
  49   X&
  50   operator=(X&& other)
  51   {
  52     a = other.a;
  53     other.moved_from = true;
  54     moved_from = false;
  55     return *this;
  56   }
  57 };
  58
  59 template<int N, template<typename> typename Wrapper>
  60 void
  61 test01()
  62 {
  63   for (int n = 0; n < N+5; n++)
  64     {
  65       X x[N];
  66       for (int i = 0; i < N; i++)
  67         x[i] = X{i};
  68       test_container<X, Wrapper> cx(x);
  69       auto out = std::shift_left(cx.begin(), cx.end(), n);
  70       if (n < N)
  71         {
  72           VERIFY( out.ptr == x+(N-n) );
  73           for (int i = 0; i < N-n; i++)
  74             {
  75               VERIFY( x[i].a == n+i );
  76               VERIFY( !x[i].moved_from );
  77             }
  78           for (int i = std::max(n, N-n); i < N; i++)
  79             VERIFY( x[i].moved_from );
  80         }
  81       else
  82         {
  83           VERIFY( out.ptr == x );
  84           for (int i = 0; i < N; i++)
  85             {
  86               VERIFY( x[i].a == i );
  87               VERIFY( !x[i].moved_from );
  88             }
  89         }
  90     }
  91 }
  92
  93 int
  94 main()
  95 {
  96   test01<23, forward_iterator_wrapper>();
  97   test01<23, bidirectional_iterator_wrapper>();
  98   test01<23, random_access_iterator_wrapper>();
  99
 100   test01<24, forward_iterator_wrapper>();
 101   test01<24, bidirectional_iterator_wrapper>();
 102   test01<24, random_access_iterator_wrapper>();
 103 }