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

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do run { target c++17 } }
   3
   4 // Copyright (C) 2019-2021 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 29.8.8 [inclusive.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>
  36   OutputIterator
  37   inclusive_scan(InputIterator, InputIterator, OutputIterator);
  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::inclusive_scan(ca.begin(), ca.end(), co.begin());
  46   static_assert(std::is_same_v<decltype(end), decltype(co.begin())>);
  47   VERIFY( end.ptr == out+10 );
  48   VERIFY( out[0] == 1 );
  49   VERIFY( out[1] == (1+2) );
  50   VERIFY( out[2] == (1+2+3) );
  51   VERIFY( out[3] == (1+2+3+4) );
  52   VERIFY( out[4] == (1+2+3+4+5) );
  53   VERIFY( out[5] == (1+2+3+4+5+6) );
  54   VERIFY( out[6] == (1+2+3+4+5+6+7) );
  55   VERIFY( out[7] == (1+2+3+4+5+6+7+8) );
  56   VERIFY( out[8] == (1+2+3+4+5+6+7+8+9) );
  57   VERIFY( out[9] == (1+2+3+4+5+6+7+8+9+10) );
  58 }
  59
  60 /*
  61 template<class InputIterator, class OutputIterator, class BinaryOperation>
  62   OutputIterator
  63   inclusive_scan(InputIterator, InputIterator, OutputIterator,
  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::inclusive_scan(ca.begin(), ca.end(), co.begin(),
  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] == 1 );
  77   VERIFY( out[1] == (2*1+2*2) );
  78   VERIFY( out[2] == (2*6+2*3) );
  79   VERIFY( out[3] == (2*18+2*4) );
  80   VERIFY( out[4] == (2*44+2*5) );
  81   VERIFY( out[5] == (2*98+2*6));
  82   VERIFY( out[6] == (2*208+2*7) );
  83   VERIFY( out[7] == (2*430+2*8) );
  84   VERIFY( out[8] == (2*876+2*9) );
  85   VERIFY( out[9] == (2*1770+2*10) );
  86 }
  87
  88 /*
  89 template<class InputIterator, class OutputIterator, class BinaryOperation, T>
  90   OutputIterator
  91   inclusive_scan(InputIterator, InputIterator, OutputIterator,
  92                  BinaryOperation, T);
  93 */
  94 void
  95 test03()
  96 {
  97   int out[10];
  98   test_container<int, output_iterator_wrapper> co(out);
  99   test_container<int, input_iterator_wrapper> ca(a);
 100   auto end = std::inclusive_scan(ca.begin(), ca.end(), co.begin(),
 101                                  [](int i, int j) { return 2*i + 2*j; },
 102                                  1);
 103   static_assert(std::is_same_v<decltype(end), decltype(co.begin())>);
 104   VERIFY( end.ptr == out+10 );
 105   VERIFY( out[0] == 4 );
 106   VERIFY( out[1] == (2*4+2*2) );
 107   VERIFY( out[2] == (2*12+2*3) );
 108   VERIFY( out[3] == (2*30+2*4) );
 109   VERIFY( out[4] == (2*68+2*5) );
 110   VERIFY( out[5] == (2*146+2*6) );
 111   VERIFY( out[6] == (2*304+2*7));
 112   VERIFY( out[7] == (2*622+2*8) );
 113   VERIFY( out[8] == (2*1260+2*9) );
 114   VERIFY( out[9] == (2*2538+2*10) );
 115 }
 116
 117 int
 118 main()
 119 {
 120   test01();
 121   test02();
 122   test03();
 123 }