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

   1 // { dg-do run { target c++17 } }
   2
   3 // Copyright (C) 2019-2023 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 29.8.8 [inclusive.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>
  35   OutputIterator
  36   inclusive_scan(InputIterator, InputIterator, OutputIterator);
  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::inclusive_scan(ca.begin(), ca.end(), co.begin());
  45   static_assert(std::is_same_v<decltype(end), decltype(co.begin())>);
  46   VERIFY( end.ptr == out+10 );
  47   VERIFY( out[0] == 1 );
  48   VERIFY( out[1] == (1+2) );
  49   VERIFY( out[2] == (1+2+3) );
  50   VERIFY( out[3] == (1+2+3+4) );
  51   VERIFY( out[4] == (1+2+3+4+5) );
  52   VERIFY( out[5] == (1+2+3+4+5+6) );
  53   VERIFY( out[6] == (1+2+3+4+5+6+7) );
  54   VERIFY( out[7] == (1+2+3+4+5+6+7+8) );
  55   VERIFY( out[8] == (1+2+3+4+5+6+7+8+9) );
  56   VERIFY( out[9] == (1+2+3+4+5+6+7+8+9+10) );
  57 }
  58
  59 /*
  60 template<class InputIterator, class OutputIterator, class BinaryOperation>
  61   OutputIterator
  62   inclusive_scan(InputIterator, InputIterator, OutputIterator,
  63                  BinaryOperation);
  64 */
  65 void
  66 test02()
  67 {
  68   int out[10];
  69   test_container<int, output_iterator_wrapper> co(out);
  70   test_container<int, input_iterator_wrapper> ca(a);
  71   auto end = std::inclusive_scan(ca.begin(), ca.end(), co.begin(),
  72                                  [](int i, int j) { return 2*i + 2*j; });
  73   static_assert(std::is_same_v<decltype(end), decltype(co.begin())>);
  74   VERIFY( end.ptr == out+10 );
  75   VERIFY( out[0] == 1 );
  76   VERIFY( out[1] == (2*1+2*2) );
  77   VERIFY( out[2] == (2*6+2*3) );
  78   VERIFY( out[3] == (2*18+2*4) );
  79   VERIFY( out[4] == (2*44+2*5) );
  80   VERIFY( out[5] == (2*98+2*6));
  81   VERIFY( out[6] == (2*208+2*7) );
  82   VERIFY( out[7] == (2*430+2*8) );
  83   VERIFY( out[8] == (2*876+2*9) );
  84   VERIFY( out[9] == (2*1770+2*10) );
  85 }
  86
  87 /*
  88 template<class InputIterator, class OutputIterator, class BinaryOperation, T>
  89   OutputIterator
  90   inclusive_scan(InputIterator, InputIterator, OutputIterator,
  91                  BinaryOperation, T);
  92 */
  93 void
  94 test03()
  95 {
  96   int out[10];
  97   test_container<int, output_iterator_wrapper> co(out);
  98   test_container<int, input_iterator_wrapper> ca(a);
  99   auto end = std::inclusive_scan(ca.begin(), ca.end(), co.begin(),
 100                                  [](int i, int j) { return 2*i + 2*j; },
 101                                  1);
 102   static_assert(std::is_same_v<decltype(end), decltype(co.begin())>);
 103   VERIFY( end.ptr == out+10 );
 104   VERIFY( out[0] == 4 );
 105   VERIFY( out[1] == (2*4+2*2) );
 106   VERIFY( out[2] == (2*12+2*3) );
 107   VERIFY( out[3] == (2*30+2*4) );
 108   VERIFY( out[4] == (2*68+2*5) );
 109   VERIFY( out[5] == (2*146+2*6) );
 110   VERIFY( out[6] == (2*304+2*7));
 111   VERIFY( out[7] == (2*622+2*8) );
 112   VERIFY( out[8] == (2*1260+2*9) );
 113   VERIFY( out[9] == (2*2538+2*10) );
 114 }
 115
 116 int
 117 main()
 118 {
 119   test01();
 120   test02();
 121   test03();
 122 }