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

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2015-2017 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 #include <string>
  21 #include <tuple>
  22 #include <testsuite_hooks.h>
  23
  24 static std::string result;
  25
  26 struct X {
  27   int state; // this has to be here
  28   X() {
  29     result += "Def";
  30   }
  31
  32   X(X const&) {
  33     result += "Copy";
  34   }
  35
  36   X(X&&) {
  37     result += "Move";
  38   }
  39
  40   ~X() {
  41     result += "Dtor";
  42   }
  43 };
  44
  45 void f()
  46 {
  47   X v;
  48   std::tuple<X> t1{v};
  49   std::tuple<std::tuple<X>&&> t2{std::move(t1)};
  50   std::tuple<std::tuple<X>> t3{std::move(t2)};
  51 }
  52
  53 void f2()
  54 {
  55   X v;
  56   std::tuple<X> t1{std::move(v)};
  57   std::tuple<std::tuple<X>&&> t2{std::move(t1)};
  58   std::tuple<std::tuple<X>> t3{std::move(t2)};
  59 }
  60
  61 void f3()
  62 {
  63   std::tuple<X> t1{X{}};
  64   std::tuple<std::tuple<X>&&> t2{std::move(t1)};
  65   std::tuple<std::tuple<X>> t3{std::move(t2)};
  66 }
  67
  68 void f4()
  69 {
  70   std::allocator<X> a;
  71   X v;
  72   std::tuple<X> t1{std::allocator_arg, a, v};
  73   std::tuple<std::tuple<X>&&> t2{std::allocator_arg, a, std::move(t1)};
  74   std::tuple<std::tuple<X>> t3{std::allocator_arg, a, std::move(t2)};
  75 }
  76
  77 void f5()
  78 {
  79   std::allocator<X> a;
  80   X v;
  81   std::tuple<X> t1{std::allocator_arg, a, std::move(v)};
  82   std::tuple<std::tuple<X>&&> t2{std::allocator_arg, a, std::move(t1)};
  83   std::tuple<std::tuple<X>> t3{std::allocator_arg, a, std::move(t2)};
  84 }
  85
  86 void f6()
  87 {
  88   std::allocator<X> a;
  89   std::tuple<X> t1{std::allocator_arg, a, X{}};
  90   std::tuple<std::tuple<X>&&> t2{std::allocator_arg, a, std::move(t1)};
  91   std::tuple<std::tuple<X>> t3{std::allocator_arg, a, std::move(t2)};
  92 }
  93
  94 int main()
  95 {
  96   f();
  97   VERIFY(result == "DefCopyMoveDtorDtorDtor");
  98   result = "";
  99   f2();
 100   VERIFY(result == "DefMoveMoveDtorDtorDtor");
 101   result = "";
 102   f3();
 103   VERIFY(result == "DefMoveDtorMoveDtorDtor");
 104   result = "";
 105   f4();
 106   VERIFY(result == "DefCopyMoveDtorDtorDtor");
 107   result = "";
 108   f5();
 109   VERIFY(result == "DefMoveMoveDtorDtorDtor");
 110   result = "";
 111   f6();
 112   VERIFY(result == "DefMoveDtorMoveDtorDtor");
 113   result = "";
 114 }