libstdc++-v3/testsuite/25_algorithms/rotate_copy/constrained.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::test_range;
  26 using __gnu_test::forward_iterator_wrapper;
  27 using __gnu_test::random_access_iterator_wrapper;
  28
  29 namespace ranges = std::ranges;
  30
  31 struct X
  32 {
  33   int i;
  34   X () : i(0) { }
  35   X (int a) : i(a) { }
  36
  37   friend bool
  38   operator==(const X& lhs, const X& rhs)
  39   {
  40     return lhs.i == rhs.i;
  41   }
  42 };
  43
  44 static_assert(!std::is_trivially_default_constructible_v<X>);
  45
  46 template<template<typename, template<typename> typename> typename container,
  47          template<typename> typename wrapper,
  48          typename T = int>
  49 void
  50 test01()
  51 {
  52   for (int a = 0; a <= 7; a++)
  53     {
  54       T x[] = {1, 2, 3, 4, 5, 6, 7};
  55       T w[7];
  56       container<T, wrapper> rx(x), rw(w);
  57       auto i = ranges::begin(rx);
  58       std::advance(i, a);
  59       auto [in,out] = ranges::rotate_copy(rx, i, ranges::begin(rw));
  60       VERIFY( in == ranges::end(rx) );
  61       VERIFY( out == ranges::end(rw) );
  62       for (int k = 0; k < 7; k++)
  63         VERIFY( w[k] == (k+a)%7 + 1 );
  64     }
  65 }
  66
  67 constexpr bool
  68 test02()
  69 {
  70   const int x[] = {1, 2, 3, 4};
  71   int w[3];
  72   const int y[] = { 2, 3, 1};
  73   auto [in,out] = ranges::rotate_copy(x, x+1, x+3, w);
  74   return (in == x+3
  75           && out == w+3
  76           && ranges::equal(w, y));
  77 }
  78
  79 int
  80 main()
  81 {
  82   test01<test_container, forward_iterator_wrapper>();
  83   test01<test_range, forward_iterator_wrapper>();
  84
  85   test01<test_container, random_access_iterator_wrapper>();
  86   test01<test_range, random_access_iterator_wrapper>();
  87
  88   test01<test_container, random_access_iterator_wrapper, X>();
  89   test01<test_range, random_access_iterator_wrapper, X>();
  90
  91   static_assert(test02());
  92 }