libstdc++-v3/testsuite/25_algorithms/merge/1.cc

   1 // Copyright (C) 2005-2021 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // 25.3.4 [lib.alg.merge]
  19
  20 #include <algorithm>
  21 #include <testsuite_hooks.h>
  22 #include <testsuite_iterators.h>
  23
  24 using __gnu_test::test_container;
  25 using __gnu_test::input_iterator_wrapper;
  26 using __gnu_test::output_iterator_wrapper;
  27 using std::merge;
  28
  29 typedef test_container<int, input_iterator_wrapper> Icontainer;
  30 typedef test_container<int, output_iterator_wrapper> Ocontainer;
  31
  32 void
  33 test1()
  34 {
  35   int array1[1], array2[1];
  36   Icontainer con1(array1, array1);
  37   Icontainer con2(array1, array1);
  38   Ocontainer con3(array2, array2);
  39   VERIFY(merge(con1.begin(), con1.end(), con2.begin(), con2.end(),
  40                con3.begin()).ptr == array2);
  41 }
  42
  43 void
  44 test2()
  45 {
  46   int array1[]={0,1,4};
  47   int array2[]={2,3};
  48   int array3[5];
  49   Icontainer con1(array1, array1 + 3);
  50   Icontainer con2(array2, array2 + 2);
  51   Ocontainer con3(array3, array3 + 5);
  52   VERIFY(merge(con1.begin(), con1.end(), con2.begin(), con2.end(),
  53                con3.begin()).ptr == array3 + 5);
  54   VERIFY(array3[0] == 0 && array3[1] == 1 && array3[2] == 2 &&
  55          array3[3] == 3 && array3[4] == 4);
  56
  57 }
  58
  59 struct S
  60 {
  61   int i;
  62   int j;
  63   S() {}
  64   S(int in)
  65   {
  66     if(in > 0)
  67     {
  68       i = in;
  69       j = 1;
  70     }
  71     else
  72     {
  73       i = -in;
  74       j = 0;
  75     }
  76   }
  77 };
  78
  79 bool
  80 operator<(const S& s1, const S& s2)
  81 { return s1.i < s2.i; }
  82
  83 void
  84 test3()
  85 {
  86   S array1[] = { -1 , -3};
  87   S array2[] = { 1, 2, 3};
  88   S array3[5];
  89   merge(array1, array1 + 2, array2, array2 + 3, array3);
  90   VERIFY(array3[0].j == 0 && array3[1].j == 1 && array3[2].j == 1 &&
  91          array3[3].j == 0 && array3[4].j == 1);
  92 }
  93
  94 int
  95 main()
  96 {
  97   test1();
  98   test2();
  99   test3();
 100 }