libstdc++-v3/testsuite/20_util/tuple/cons/nested_tuple_construct.cc

   1 // Copyright (C) 2015-2016 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 #include <string>
  19 #include <tuple>
  20 #include <testsuite_hooks.h>
  21
  22 static std::string result;
  23
  24 struct X {
  25   int state; // this has to be here
  26   X() {
  27     result += "Def";
  28   }
  29
  30   X(X const&) {
  31     result += "Copy";
  32   }
  33
  34   X(X&&) {
  35     result += "Move";
  36   }
  37
  38   ~X() {
  39     result += "Dtor";
  40   }
  41 };
  42
  43 void f()
  44 {
  45   X v;
  46   std::tuple<X> t1{v};
  47   std::tuple<std::tuple<X>&&> t2{std::move(t1)};
  48   std::tuple<std::tuple<X>> t3{std::move(t2)};
  49 }
  50
  51 void f2()
  52 {
  53   X v;
  54   std::tuple<X> t1{std::move(v)};
  55   std::tuple<std::tuple<X>&&> t2{std::move(t1)};
  56   std::tuple<std::tuple<X>> t3{std::move(t2)};
  57 }
  58
  59 void f3()
  60 {
  61   std::tuple<X> t1{X{}};
  62   std::tuple<std::tuple<X>&&> t2{std::move(t1)};
  63   std::tuple<std::tuple<X>> t3{std::move(t2)};
  64 }
  65
  66 int main()
  67 {
  68   f();
  69   VERIFY(result == "DefCopyMoveDtorDtorDtor");
  70   result = "";
  71   f2();
  72   VERIFY(result == "DefMoveMoveDtorDtorDtor");
  73   result = "";
  74   f3();
  75   VERIFY(result == "DefMoveDtorMoveDtorDtor");
  76   result = "";
  77 }