libstdc++-v3/testsuite/ext/concept_checks.cc

   1 // 2001-12-28  Phil Edwards  <pme@gcc.gnu.org>
   2 //
   3 // Copyright (C) 2001-2024 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 // Concept checking must remain sane.
  21
  22 // { dg-options "-D_GLIBCXX_CONCEPT_CHECKS" }
  23
  24 #include <vector>
  25 #include <string>
  26 #include <algorithm>
  27 #include <testsuite_hooks.h>
  28
  29 using namespace std;
  30
  31
  32 // PR libstdc++/2054 and follow-up discussion
  33 struct indirectCompare
  34 {
  35   indirectCompare(const vector<string>& v) : V(v) {}
  36
  37   bool operator()( int x,  int y) const
  38   {
  39        return V[x] < V[y];
  40   }
  41
  42   bool operator()( int x, const string& a) const
  43   {
  44        return V[x] < a;
  45   }
  46
  47   bool operator()( const string& a, int x) const
  48   {
  49        return V[x] < a;
  50   }
  51
  52   const vector<string>& V;
  53 };
  54
  55 void
  56 test2054( )
  57 {
  58   const int Maxi = 1022;
  59
  60   vector<string> Words(Maxi);
  61   vector<int> Index(Maxi);
  62
  63   for(size_t i = 0; i < Index.size(); i++)
  64      Index[i] = i;
  65
  66   indirectCompare aComparison(Words);
  67
  68   sort(Index.begin(), Index.end(), aComparison);
  69
  70   string SearchTerm;
  71
  72   lower_bound(Index.begin(), Index.end(), SearchTerm, aComparison);
  73   upper_bound(Index.begin(), Index.end(), SearchTerm, aComparison);
  74   equal_range(Index.begin(), Index.end(), SearchTerm, aComparison);
  75   binary_search(Index.begin(), Index.end(), SearchTerm, aComparison);
  76   // { dg-warning "ignoring return value" "" { target c++17 } 72 }
  77   // { dg-warning "ignoring return value" "" { target c++17 } 73 }
  78   // { dg-warning "ignoring return value" "" { target c++17 } 74 }
  79   // { dg-warning "ignoring return value" "" { target c++17 } 75 }
  80 }
  81
  82 int main()
  83 {
  84   test2054();
  85   return 0;
  86 }