libstdc++-v3/testsuite/25_algorithms/unique_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_range;
  25 using __gnu_test::input_iterator_wrapper;
  26 using __gnu_test::output_iterator_wrapper;
  27 using __gnu_test::forward_iterator_wrapper;
  28
  29 namespace ranges = std::ranges;
  30
  31 template<template<typename> typename source_wrapper,
  32          template<typename> typename dest_wrapper>
  33 void
  34 test01()
  35 {
  36   int x[6] = {0, 0, 0, 1, 1, 1};
  37   int y[2];
  38   const int z[2] = {0, 1};
  39
  40   test_range<int, source_wrapper> rx(x);
  41   test_range<int, dest_wrapper> ry(y);
  42   auto [in,out] = ranges::unique_copy(rx, ry.begin());
  43   VERIFY( in == ranges::end(rx) && out == ranges::end(ry) );
  44   VERIFY( ranges::equal(y, z) );
  45 }
  46
  47 template<template<typename> typename source_wrapper,
  48          template<typename> typename dest_wrapper>
  49 void
  50 test02()
  51 {
  52   int x[6] = {0, 0, 0, 1, 1, 1};
  53   int y[2] = {0, 0};
  54   const int z[2] = {0, 0};
  55
  56   test_range<int, source_wrapper> rx(x, x);
  57   test_range<int, dest_wrapper> ry(y, y);
  58   auto [in, out] = ranges::unique_copy(rx.begin(), rx.end(), ry.begin());
  59   VERIFY( in.ptr == x && out.ptr == y );
  60   VERIFY( ranges::equal(y, z) );
  61 }
  62
  63 template<template<typename> typename source_wrapper,
  64          template<typename> typename dest_wrapper>
  65 void
  66 test03()
  67 {
  68   struct X { int i; };
  69   X x[6] = { {1}, {2}, {2}, {4}, {4}, {6} };
  70   X y[4] = { {1}, {2}, {4}, {6} };
  71   const X z[4] = { {1}, {2}, {4}, {6} };
  72
  73   test_range<X, source_wrapper> rx(x);
  74   test_range<X, dest_wrapper> ry(y);
  75   auto [in, out]
  76     = ranges::unique_copy(rx, ry.begin(), ranges::equal_to{}, &X::i);
  77   VERIFY( in == ranges::end(rx) && out == ranges::end(ry) );
  78   VERIFY( ranges::equal(y, z, {}, &X::i, &X::i) );
  79 }
  80
  81 constexpr bool
  82 test04()
  83 {
  84   struct X { int i; };
  85   X x[7] = { {1}, {2}, {2}, {2}, {4}, {4}, {6} };
  86   X y[4] = { {1}, {2}, {4}, {6} };
  87   const X z[4] = { {1}, {2}, {4}, {6} };
  88
  89   auto [in, out]
  90     = ranges::unique_copy(x, x+7, y, ranges::equal_to{}, &X::i);
  91   return (in == ranges::end(x)
  92           && out == ranges::end(y)
  93           && ranges::equal(y, z, {}, &X::i, &X::i));
  94 }
  95
  96 int
  97 main()
  98 {
  99   test01<input_iterator_wrapper, output_iterator_wrapper>();
 100   test01<input_iterator_wrapper, forward_iterator_wrapper>();
 101   test01<forward_iterator_wrapper, output_iterator_wrapper>();
 102
 103   test02<input_iterator_wrapper, output_iterator_wrapper>();
 104   test02<input_iterator_wrapper, forward_iterator_wrapper>();
 105   test02<forward_iterator_wrapper, output_iterator_wrapper>();
 106
 107   test03<input_iterator_wrapper, output_iterator_wrapper>();
 108   test03<input_iterator_wrapper, forward_iterator_wrapper>();
 109   test03<forward_iterator_wrapper, output_iterator_wrapper>();
 110
 111   static_assert(test04());
 112 }