libstdc++-v3/testsuite/26_numerics/exclusive_scan/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 29.8.7 [exclusive.scan]
  21
  22 #include <numeric>
  23 #include <iterator>
  24 #include <testsuite_hooks.h>
  25 #include <testsuite_iterators.h>
  26
  27 int a[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
  28
  29 using __gnu_test::test_container;
  30 using __gnu_test::input_iterator_wrapper;
  31 using __gnu_test::output_iterator_wrapper;
  32
  33 /*
  34 template<class InputIterator, class OutputIterator, class T>
  35   OutputIterator
  36   exclusive_scan(InputIterator, InputIterator, OutputIterator, T);
  37 */
  38 void
  39 test01()
  40 {
  41   int out[10];
  42   test_container<int, output_iterator_wrapper> co(out);
  43   test_container<int, input_iterator_wrapper> ca(a);
  44   auto end = std::exclusive_scan(ca.begin(), ca.end(), co.begin(), 5);
  45   static_assert(std::is_same_v<decltype(end), decltype(co.begin())>);
  46   VERIFY( end.ptr == out+10 );
  47   VERIFY( out[0] == 5 );
  48   VERIFY( out[1] == 6 );
  49   VERIFY( out[2] == 8 );
  50   VERIFY( out[3] == 11 );
  51   VERIFY( out[4] == 15 );
  52   VERIFY( out[5] == 20 );
  53   VERIFY( out[6] == 26 );
  54   VERIFY( out[7] == 33 );
  55   VERIFY( out[8] == 41 );
  56   VERIFY( out[9] == 50 );
  57 }
  58
  59 /*
  60 template<class InputIterator, class OutputIterator, class T,
  61          class BinaryOperation>
  62   OutputIterator
  63   exclusive_scan(InputIterator, InputIterator, OutputIterator, T,
  64                  BinaryOperation);
  65 */
  66 void
  67 test02()
  68 {
  69   int out[10];
  70   test_container<int, output_iterator_wrapper> co(out);
  71   test_container<int, input_iterator_wrapper> ca(a);
  72   auto end = std::exclusive_scan(ca.begin(), ca.end(), co.begin(), 2,
  73                                  [](int i, int j) { return 2*i + 2*j; });
  74   static_assert(std::is_same_v<decltype(end), decltype(co.begin())>);
  75   VERIFY( end.ptr == out+10 );
  76   VERIFY( out[0] == 2 );
  77   VERIFY( out[1] == 6 );
  78   VERIFY( out[2] == 16 );
  79   VERIFY( out[3] == 38 );
  80   VERIFY( out[4] == 84 );
  81   VERIFY( out[5] == 178 );
  82   VERIFY( out[6] == 368 );
  83   VERIFY( out[7] == 750 );
  84   VERIFY( out[8] == 1516 );
  85   VERIFY( out[9] == 3050 );
  86 }
  87
  88 int
  89 main()
  90 {
  91   test01();
  92   test02();
  93 }