libstdc++-v3/testsuite/26_numerics/reduce/1.cc

   1 // { dg-do run { target c++17 } }
   2
   3 // Copyright (C) 2019-2024 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // C++17 29.8.3 [reduce]
  21
  22 #include <numeric>
  23 #include <iterator>
  24 #include <testsuite_hooks.h>
  25 #include <testsuite_iterators.h>
  26
  27 /*
  28 template<class InputIterator>
  29   iterator_traits<InputIterator>::value_type
  30   reduce(InputIterator, InputIterator);
  31 */
  32 void
  33 test01()
  34 {
  35   using __gnu_test::test_container;
  36   using __gnu_test::input_iterator_wrapper;
  37   int array[5] = { 1, 2, 3, 4, 5 };
  38   test_container<int, input_iterator_wrapper> con(array);
  39   int res = std::reduce(con.begin(), con.end());
  40   VERIFY( res == 15 );
  41 }
  42
  43 /*
  44 template<class InputIterator, class T>
  45   T reduce(InputIterator, InputIterator, T);
  46 */
  47 void
  48 test02()
  49 {
  50   bool b[] = {true, false, true, true, false, true, false, true, true, false};
  51   int res = std::reduce(std::begin(b), std::end(b), 100);
  52   VERIFY( res == 106 );
  53 }
  54
  55 /*
  56 template<class InputIterator, class T>
  57   T reduce(InputIterator, InputIterator, T);
  58 template<class InputIterator, class T, class BinaryOperation>
  59   T reduce(InputIterator, InputIterator, T, BinaryOperation);
  60 */
  61 void
  62 test03()
  63 {
  64   int a[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
  65
  66   auto res = std::reduce(std::begin(a), std::end(a), (short)11);
  67   static_assert(std::is_same_v<decltype(res), short>);
  68   VERIFY( res == 66 );
  69
  70   auto res2 = std::reduce(std::begin(a), std::end(a), -1l, std::multiplies<>());
  71   static_assert(std::is_same_v<decltype(res2), long>);
  72   VERIFY( res2 == -3628800 );
  73 }
  74
  75 int
  76 main()
  77 {
  78   test01();
  79   test02();
  80   test03();
  81 }