libstdc++-v3/testsuite/25_algorithms/replace_if/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::input_iterator_wrapper;
  27 using __gnu_test::forward_iterator_wrapper;
  28
  29 namespace ranges = std::ranges;
  30
  31 struct X
  32 {
  33   int i;
  34
  35   friend constexpr bool
  36   operator==(const X& a, const X& b)
  37   {
  38     return a.i == b.i;
  39   }
  40 };
  41
  42 void
  43 test01()
  44 {
  45   auto is_even_p = [] (int a) { return a%2 == 0; };
  46   auto is_negative_p = [] (int a) { return a < 0; };
  47   auto is_two_p = [] (int a) { return a == 2; };
  48     {
  49       X x[6] = { {1}, {2}, {6}, {8}, {10}, {11} };
  50       X y[6] = { {1}, {9}, {9}, {9}, {9}, {11} };
  51       auto res = ranges::replace_if(x, x+5, is_even_p, X{9}, &X::i);
  52       VERIFY( res == x+5 );
  53       VERIFY( ranges::equal(x, y) );
  54     }
  55
  56     {
  57       X x[6] = { {2}, {2}, {6}, {8}, {10}, {11} };
  58       X y[6] = { {2}, {2}, {6}, {8}, {10}, {11} };
  59       auto res = ranges::replace_if(x, x+5, is_negative_p, X{9}, &X::i);
  60       VERIFY( res == x+5 );
  61       VERIFY( ranges::equal(x, y) );
  62     }
  63
  64     {
  65       X x[6] = { {2}, {2}, {6}, {8}, {10}, {11} };
  66       X y[6] = { {7}, {7}, {6}, {8}, {10}, {11} };
  67       test_container<X, forward_iterator_wrapper> cx(x), cy(y);
  68       auto res = ranges::replace_if(cx, is_two_p, X{7}, &X::i);
  69       VERIFY( res == cx.end() );
  70       VERIFY( ranges::equal(cx, cy) );
  71     }
  72
  73     {
  74       int x[6] = { {2}, {2}, {6}, {8}, {10}, {2} };
  75       int y[6] = { {7}, {7}, {6}, {8}, {10}, {7} };
  76       test_range<int, input_iterator_wrapper> rx(x), ry(y);
  77       auto res = ranges::replace_if(rx, is_two_p, 7);
  78       VERIFY( res == rx.end() );
  79
  80       rx.bounds.first = x;
  81       ry.bounds.first = y;
  82       VERIFY( ranges::equal(rx, ry) );
  83     }
  84 }
  85
  86 struct Y { int i; int j; };
  87
  88 constexpr bool
  89 test02()
  90 {
  91   bool ok = true;
  92   Y x[] = { {3,2}, {2,4}, {3,6} };
  93   Y y[] = { {4,5}, {2,4}, {4,5} };
  94   auto res = ranges::replace_if(x, [] (int a) { return a%2 == 1; },
  95                                 Y{4,5}, &Y::i);
  96   ok &= res == x+3;
  97   ok &= ranges::equal(x, y, {}, &Y::i, &Y::i);
  98   ok &= ranges::equal(x, y, {}, &Y::j, &Y::j);
  99   return ok;
 100 }
 101
 102 int
 103 main()
 104 {
 105   test01();
 106   static_assert(test02());
 107 }
 108