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

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do run { target c++17 } }
   3
   4 // Copyright (C) 2019-2020 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 // C++17 29.8.3 [reduce]
  22
  23 #include <numeric>
  24 #include <iterator>
  25 #include <testsuite_hooks.h>
  26 #include <testsuite_iterators.h>
  27
  28 /*
  29 template<class InputIterator>
  30   iterator_traits<InputIterator>::value_type
  31   reduce(InputIterator, InputIterator);
  32 */
  33 void
  34 test01()
  35 {
  36   using __gnu_test::test_container;
  37   using __gnu_test::input_iterator_wrapper;
  38   int array[5] = { 1, 2, 3, 4, 5 };
  39   test_container<int, input_iterator_wrapper> con(array);
  40   int res = std::reduce(con.begin(), con.end());
  41   VERIFY( res == 15 );
  42 }
  43
  44 /*
  45 template<class InputIterator, class T>
  46   T reduce(InputIterator, InputIterator, T);
  47 */
  48 void
  49 test02()
  50 {
  51   bool b[] = {true, false, true, true, false, true, false, true, true, false};
  52   int res = std::reduce(std::begin(b), std::end(b), 100);
  53   VERIFY( res == 106 );
  54 }
  55
  56 /*
  57 template<class InputIterator, class T>
  58   T reduce(InputIterator, InputIterator, T);
  59 template<class InputIterator, class T, class BinaryOperation>
  60   T reduce(InputIterator, InputIterator, T, BinaryOperation);
  61 */
  62 void
  63 test03()
  64 {
  65   int a[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
  66
  67   auto res = std::reduce(std::begin(a), std::end(a), (short)11);
  68   static_assert(std::is_same_v<decltype(res), short>);
  69   VERIFY( res == 66 );
  70
  71   auto res2 = std::reduce(std::begin(a), std::end(a), -1l, std::multiplies<>());
  72   static_assert(std::is_same_v<decltype(res2), long>);
  73   VERIFY( res2 == -3628800 );
  74 }
  75
  76 int
  77 main()
  78 {
  79   test01();
  80   test02();
  81   test03();
  82 }