libstdc++-v3/testsuite/23_containers/unordered_set/modifiers/emplace.cc

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2011-2025 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 // range insert
  21
  22 #include <vector>
  23 #include <unordered_set>
  24 #include <testsuite_hooks.h>
  25
  26 class PathPoint
  27 {
  28 public:
  29   PathPoint(char t, const std::vector<double>& c)
  30   : type(t), coords(c) { }
  31   PathPoint(char t, std::vector<double>&& c)
  32   : type(t), coords(std::move(c)) { }
  33   char getType() const { return type; }
  34   const std::vector<double>& getCoords() const { return coords; }
  35 private:
  36   char type;
  37   std::vector<double> coords;
  38 };
  39
  40 struct PathPointHasher
  41 {
  42   std::size_t operator() (const PathPoint& __pp) const
  43   { return __pp.getType(); }
  44 };
  45
  46 struct PathPointEqual
  47 {
  48   bool operator() (const PathPoint& __lhs, const PathPoint& __rhs) const
  49   { return __lhs.getType() == __rhs.getType(); }
  50 };
  51
  52 void test01()
  53 {
  54   typedef std::unordered_set<PathPoint, PathPointHasher, PathPointEqual> Set;
  55   Set s;
  56
  57   std::vector<double> coord1 = { 0.0, 1.0, 2.0 };
  58
  59   auto ret = s.emplace('a', coord1);
  60   VERIFY( ret.second );
  61   VERIFY( s.size() == 1 );
  62   VERIFY( ret.first->getType() == 'a' );
  63
  64   coord1[0] = 3.0;
  65   ret = s.emplace('a', coord1);
  66   VERIFY( !ret.second );
  67   VERIFY( s.size() == 1 );
  68   VERIFY( ret.first->getType() == 'a' );
  69   VERIFY( ret.first->getCoords()[0] == 0.0 );
  70
  71   auto it = s.emplace_hint(s.begin(), 'b', coord1);
  72   VERIFY( it != s.end() );
  73   VERIFY( it->getType() == 'b' );
  74   VERIFY( it->getCoords()[0] == 3.0 );
  75
  76   double *px = &coord1[0];
  77   ret = s.emplace('c', std::move(coord1));
  78   VERIFY( ret.second );
  79   VERIFY( ret.first->getType() == 'c' );
  80   VERIFY( &(ret.first->getCoords()[0]) == px );
  81 }
  82
  83 int main()
  84 {
  85   test01();
  86   return 0;
  87 }