libstdc++-v3/testsuite/25_algorithms/replace_copy_if/constrained.cc

   1 // Copyright (C) 2020-2023 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-options "-std=gnu++2a" }
  19 // { dg-do run { target c++2a } }
  20
  21 #include <algorithm>
  22 #include <testsuite_hooks.h>
  23 #include <testsuite_iterators.h>
  24
  25 using __gnu_test::test_container;
  26 using __gnu_test::test_range;
  27 using __gnu_test::input_iterator_wrapper;
  28 using __gnu_test::output_iterator_wrapper;
  29 using __gnu_test::forward_iterator_wrapper;
  30
  31 namespace ranges = std::ranges;
  32
  33 struct X
  34 {
  35   int i;
  36
  37   friend constexpr bool
  38   operator==(const X& a, const X& b)
  39   {
  40     return a.i == b.i;
  41   }
  42 };
  43
  44 void
  45 test01()
  46 {
  47   auto is_negative_p = [] (int a) { return a < 0; };
  48   auto is_two_p = [] (int a) { return a == 2; };
  49
  50     {
  51       const X x[6] = { {2}, {2}, {6}, {8}, {10}, {11} };
  52       X y[5];
  53       X z[5] = { {9}, {9}, {6}, {8}, {10} };
  54       auto [in, out] = ranges::replace_copy_if(x, x+5, y,
  55                                                is_two_p, X{9}, &X::i);
  56       VERIFY( in == x+5 && out == y+5 );
  57       VERIFY( ranges::equal(y, z) );
  58     }
  59
  60     {
  61       const X x[6] = { {2}, {2}, {6}, {8}, {10}, {11} };
  62       X y[5];
  63       X z[5] = { {2}, {2}, {6}, {8}, {10} };
  64       auto [in, out] = ranges::replace_copy_if(x, x+5, y,
  65                                                is_negative_p, X{9}, &X::i);
  66       VERIFY( in == x+5 && out == y+5 );
  67       VERIFY( ranges::equal(x, x+5, y, y+5) && ranges::equal(y, z) );
  68     }
  69
  70     {
  71       X x[6] = { {2}, {2}, {6}, {8}, {10}, {11} };
  72       X y[6];
  73       X z[6] = { {7}, {7}, {6}, {8}, {10}, {11} };
  74       test_container<X, forward_iterator_wrapper> cx(x), cy(y), cz(z);
  75       auto [in, out] = ranges::replace_copy_if(cx, cy.begin(),
  76                                                is_two_p, X{7}, &X::i);
  77       VERIFY( in == cx.end() && out == cy.end() );
  78       VERIFY( ranges::equal(cy, cz) );
  79     }
  80
  81     {
  82       X x[6] = { {2}, {2}, {6}, {8}, {10}, {11} };
  83       X y[6];
  84       const X z[6] = { {7}, {7}, {6}, {8}, {10}, {11} };
  85       test_range<X, input_iterator_wrapper> cx(x);
  86       test_range<X, output_iterator_wrapper> cy(y);
  87       auto [in, out] = ranges::replace_copy_if(cx, cy.begin(),
  88                                                is_two_p, X{7}, &X::i);
  89       VERIFY( in == cx.end() && out == cy.end() );
  90       VERIFY( ranges::equal(y, z) );
  91     }
  92 }
  93
  94 struct Y { int i; int j; };
  95
  96 constexpr bool
  97 test02()
  98 {
  99   bool ok = true;
 100   Y x[] = { {3,2}, {2,4}, {3,6} };
 101   Y y[] = { {4,5}, {2,4}, {4,5} };
 102   Y z[] = { {4,5}, {2,4}, {4,5} };
 103   auto [in, out]
 104     = ranges::replace_copy_if(x, y,
 105                               [] (int a) { return a%2 == 1; }, Y{4,5}, &Y::i);
 106   ok &= in == x+3;
 107   ok &= out == y+3;
 108   ok &= ranges::equal(y, z, {}, &Y::i, &Y::i);
 109   ok &= ranges::equal(y, z, {}, &Y::j, &Y::j);
 110   return ok;
 111 }
 112
 113 int
 114 main()
 115 {
 116   test01();
 117   static_assert(test02());
 118 }