* testsuite/23_containers/vector/modifiers/insert/aliasing.cc: New.

From-SVN: r238169

libstdc++-v3/ChangeLog

@@ -1,3 +1,7 @@
+2016-07-08  Jonathan Wakely  <jwakely@redhat.com>
+
+	* testsuite/23_containers/vector/modifiers/insert/aliasing.cc: New.
+
 2016-07-07  Jonathan Wakely  <jwakely@redhat.com>
 
 	* doc/xml/manual/status_cxx2014.xml: Update LFTS status table.

libstdc++-v3/testsuite/23_containers/vector/modifiers/insert/aliasing.cc

@@ -0,0 +1,79 @@
+// Copyright (C) 2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++14" }
+
+#include <vector>
+#include <memory>
+#include <testsuite_hooks.h>
+
+// See https://gcc.gnu.org/ml/libstdc++/2016-07/msg00008.html for background.
+
+struct T
+{
+ T(int v = 0) : value(v) { }
+ T(const T& t);
+ T& operator=(const T& t);
+ void make_child() { child = std::make_unique<T>(value + 10); }
+ std::unique_ptr<T> child;
+ int value;
+};
+
+T::T(const T& t) : value(t.value)
+{
+ if (t.child)
+   child.reset(new T(*t.child));
+}
+
+T& T::operator=(const T& t)
+{
+ value = t.value;
+ if (t.child)
+ {
+   if (child)
+     *child = *t.child;
+   else
+     child.reset(new T(*t.child));
+ }
+ else
+   child.reset();
+ return *this;
+}
+
+void
+test01()
+{
+ std::vector<T> v;
+ v.reserve(3);
+ v.push_back(T(1));
+ v.back().make_child();
+ v.push_back(T(2));
+ v.back().make_child();
+
+ VERIFY(v[1].child->value == 12);
+ VERIFY(v[1].child->child == nullptr);
+
+ v.insert(v.begin(), *v[1].child);
+
+ VERIFY(v[0].value == 12);
+ VERIFY(v[0].child == nullptr);
+}
+
+int main()
+{
+  test01();
+}