libstdc++-v3/testsuite/21_strings/basic_string_view/operations/compare/char/1.cc

   1 // { dg-do run { target c++17 } }
   2
   3 // Copyright (C) 2013-2024 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 // basic_string_view::compare
  21 // int compare(const basic_string_view& str) const;
  22 // int compare(size_type pos1, size_type n1, const basic_string_view& str) const;
  23 // int compare(size_type pos1, size_type n1, const basic_string_view& str,
  24 //             size_type pos2, size_type n2) const;
  25 // int compare(const charT* s) const;
  26 // int compare(size_type pos1, size_type n1,
  27 //             const charT* s, size_type n2 = npos) const;
  28
  29 // NB compare should be thought of as a lexographical compare, ie how
  30 // things would be sorted in a dictionary.
  31
  32 #include <string_view>
  33 #include <cstring>
  34 #include <testsuite_hooks.h>
  35
  36 enum want_value {lt=0, z=1, gt=2};
  37
  38 int
  39 test_value(int result, want_value expected);
  40
  41 int
  42 test_value(int result, want_value expected)
  43 {
  44   bool pass = false;
  45
  46   switch (expected) {
  47   case lt:
  48     if (result < 0)
  49       pass = true;
  50     break;
  51   case z:
  52     if (!result)
  53       pass = true;
  54     break;
  55   case gt:
  56     if (result > 0)
  57       pass = true;
  58     break;
  59   default:
  60     pass = false; //should not get here
  61   }
  62   VERIFY(pass);
  63   return 0;
  64 }
  65
  66 int
  67 test01()
  68 {
  69   using std::string_view;
  70
  71   string_view   str_0("costa rica");
  72   string_view   str_1("costa marbella");
  73   string_view   str_2;
  74
  75   //sanity check
  76   test_value(strcmp("costa marbella", "costa rica"), lt);
  77   test_value(strcmp("costa rica", "costa rica"), z);
  78   test_value(strcmp(str_1.data(), str_0.data()), lt);
  79   test_value(strcmp(str_0.data(), str_1.data()), gt);
  80   test_value(strncmp(str_1.data(), str_0.data(), 6), z);
  81   test_value(strncmp(str_1.data(), str_0.data(), 14), lt);
  82   test_value(memcmp(str_1.data(), str_0.data(), 6), z);
  83   test_value(memcmp(str_1.data(), str_0.data(), 10), lt);
  84   test_value(memcmp("costa marbella", "costa rica", 10), lt);
  85
  86   // int compare(const basic_string_view& str) const;
  87   test_value(str_0.compare(str_1), gt); //because r>m
  88   test_value(str_1.compare(str_0), lt); //because m<r
  89   str_2 = str_0;
  90   test_value(str_2.compare(str_0), z);
  91   str_2 = "cost";
  92   test_value(str_2.compare(str_0), lt);
  93   str_2 = "costa ricans";
  94   test_value(str_2.compare(str_0), gt);
  95
  96   // int compare(size_type pos1, size_type n1, const basic_string_view& str) const;
  97   test_value(str_1.compare(0, 6, str_0), lt);
  98   str_2 = "cost";
  99   test_value(str_1.compare(0, 4, str_2), z);
 100   test_value(str_1.compare(0, 5, str_2), gt);
 101
 102   // int compare(size_type pos1, size_type n1, const basic_string_view& str,
 103   //             size_type pos2, size_type n2) const;
 104   test_value(str_1.compare(0, 6, str_0, 0, 6), z);
 105   test_value(str_1.compare(0, 7, str_0, 0, 7), lt);
 106   test_value(str_0.compare(0, 7, str_1, 0, 7), gt);
 107
 108   // int compare(const charT* s) const;
 109   test_value(str_0.compare("costa marbella"), gt);
 110   test_value(str_1.compare("costa rica"), lt);
 111   str_2 = str_0;
 112   test_value(str_2.compare("costa rica"), z);
 113   test_value(str_2.compare("cost"), gt);
 114   test_value(str_2.compare("costa ricans"), lt);
 115
 116   // int compare(size_type pos, size_type n1, const charT* str,
 117   //             size_type n2 = npos) const;
 118   test_value(str_1.compare(0, 6, "costa rica", 0, 6), z);
 119   test_value(str_1.compare(0, 7, "costa rica", 0, 7), lt);
 120   test_value(str_0.compare(0, 7, "costa marbella", 0, 7), gt);
 121
 122   return 0;
 123 }
 124
 125
 126 int
 127 main()
 128 {
 129   test01();
 130
 131   return 0;
 132 }