libstdc++-v3/testsuite/26_numerics/exclusive_scan/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 29.8.7 [exclusive.scan]
  22
  23 #include <numeric>
  24 #include <iterator>
  25 #include <testsuite_hooks.h>
  26 #include <testsuite_iterators.h>
  27
  28 int a[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
  29
  30 using __gnu_test::test_container;
  31 using __gnu_test::input_iterator_wrapper;
  32 using __gnu_test::output_iterator_wrapper;
  33
  34 /*
  35 template<class InputIterator, class OutputIterator, class T>
  36   OutputIterator
  37   exclusive_scan(InputIterator, InputIterator, OutputIterator, T);
  38 */
  39 void
  40 test01()
  41 {
  42   int out[10];
  43   test_container<int, output_iterator_wrapper> co(out);
  44   test_container<int, input_iterator_wrapper> ca(a);
  45   auto end = std::exclusive_scan(ca.begin(), ca.end(), co.begin(), 5);
  46   static_assert(std::is_same_v<decltype(end), decltype(co.begin())>);
  47   VERIFY( end.ptr == out+10 );
  48   VERIFY( out[0] == 5 );
  49   VERIFY( out[1] == 6 );
  50   VERIFY( out[2] == 8 );
  51   VERIFY( out[3] == 11 );
  52   VERIFY( out[4] == 15 );
  53   VERIFY( out[5] == 20 );
  54   VERIFY( out[6] == 26 );
  55   VERIFY( out[7] == 33 );
  56   VERIFY( out[8] == 41 );
  57   VERIFY( out[9] == 50 );
  58 }
  59
  60 /*
  61 template<class InputIterator, class OutputIterator, class T,
  62          class BinaryOperation>
  63   OutputIterator
  64   exclusive_scan(InputIterator, InputIterator, OutputIterator, T,
  65                  BinaryOperation);
  66 */
  67 void
  68 test02()
  69 {
  70   int out[10];
  71   test_container<int, output_iterator_wrapper> co(out);
  72   test_container<int, input_iterator_wrapper> ca(a);
  73   auto end = std::exclusive_scan(ca.begin(), ca.end(), co.begin(), 2,
  74                                  [](int i, int j) { return 2*i + 2*j; });
  75   static_assert(std::is_same_v<decltype(end), decltype(co.begin())>);
  76   VERIFY( end.ptr == out+10 );
  77   VERIFY( out[0] == 2 );
  78   VERIFY( out[1] == 6 );
  79   VERIFY( out[2] == 16 );
  80   VERIFY( out[3] == 38 );
  81   VERIFY( out[4] == 84 );
  82   VERIFY( out[5] == 178 );
  83   VERIFY( out[6] == 368 );
  84   VERIFY( out[7] == 750 );
  85   VERIFY( out[8] == 1516 );
  86   VERIFY( out[9] == 3050 );
  87 }
  88
  89 int
  90 main()
  91 {
  92   test01();
  93   test02();
  94 }