Add tests for inserting aliased objects into std::vector

2016-07-04  François Dumont  <fdumont@gcc.gnu.org>

	* testsuite/23_containers/vector/modifiers/emplace/self_emplace.cc:
	New test.
	* testsuite/23_containers/vector/modifiers/insert/self_insert.cc: New
	test.

From-SVN: r237986

libstdc++-v3/ChangeLog

@@ -1,3 +1,10 @@
+2016-07-04  François Dumont  <fdumont@gcc.gnu.org>
+
+	* testsuite/23_containers/vector/modifiers/emplace/self_emplace.cc:
+	New test.
+	* testsuite/23_containers/vector/modifiers/insert/self_insert.cc: New
+	test.
+
 2016-07-04  Jonathan Wakely  <jwakely@redhat.com>
 
 	* include/bits/stl_vector.h (emplace(const_iterator, _Args&&...)):

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

@@ -0,0 +1,144 @@
+// { dg-options "-std=gnu++11" }
+
+// 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/>.
+
+#include <vector>
+#include "testsuite_hooks.h"
+
+bool test __attribute__((unused)) = true;
+
+void
+test01()
+{
+  std::vector<std::vector<int>> vv =
+    {
+      { 2, 3 },
+      { 4, 5 },
+      { 0, 1 }
+    };
+
+  // Make sure emplace will imply reallocation.
+  VERIFY( vv.capacity() == 3 );
+
+  vv.emplace(vv.begin(), vv[0]);
+
+  VERIFY( vv.size() == 4 );
+  VERIFY( vv[0].size() == 2 );
+  VERIFY( vv[0][0] == 2 );
+  VERIFY( vv[0][1] == 3 );
+}
+
+void
+test02()
+{
+  std::vector<std::vector<int>> vv =
+    {
+      { 2, 3 },
+      { 4, 5 },
+      { 0, 1 }
+    };
+
+  // Make sure emplace won't reallocate.
+  vv.reserve(4);
+  vv.emplace(vv.begin(), vv[0]);
+
+  VERIFY( vv.size() == 4 );
+  VERIFY( vv[0].size() == 2 );
+  VERIFY( vv[0][0] == 2 );
+  VERIFY( vv[0][1] == 3 );
+}
+
+struct A
+{
+  A(int i) : _i(i)
+  { }
+
+  A(const A& other) : _i(other._i)
+  {
+    VERIFY( other._i >= 0 );
+  }
+
+  A(A&& other) : _i(other._i)
+  {
+    VERIFY( other._i >= 0 );
+
+    other._i = -1;
+  }
+
+  A(std::vector<A>::iterator it) : _i(it->_i)
+  {
+    VERIFY( it->_i >= 0 );
+  }
+
+  A& operator=(const A&) = default;
+  A& operator=(A&& other)
+  {
+    VERIFY(other._i >= 0 );
+
+    _i = other._i;
+    other._i = -1;
+    return *this;
+  }
+
+  int _i;
+};
+
+void
+test03()
+{
+  std::vector<A> va =
+    {
+      { A(1) },
+      { A(2) },
+      { A(3) }
+    };
+
+  // Make sure emplace will imply reallocation.
+  VERIFY( va.capacity() == 3 );
+
+  va.emplace(va.begin(), va.begin());
+
+  VERIFY( va.size() == 4 );
+  VERIFY( va[0]._i == 1 );
+}
+
+void
+test04()
+{
+  std::vector<A> va =
+    {
+      { A(1) },
+      { A(2) },
+      { A(3) }
+    };
+
+  // Make sure emplace won't reallocate.
+  va.reserve(4);
+  va.emplace(va.begin(), va.begin());
+
+  VERIFY( va.size() == 4 );
+  VERIFY( va[0]._i == 1 );
+}
+
+int main()
+{
+  test01();
+  test02();
+  test03();
+  test04();
+}

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

@@ -0,0 +1,70 @@
+// { dg-options "-std=gnu++11" }
+
+// 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/>.
+
+#include <vector>
+
+#include "testsuite_hooks.h"
+
+bool test __attribute__((unused)) = true;
+
+void test01()
+{
+  std::vector<std::vector<int>> vv =
+    {
+      { 2, 3 },
+      { 4, 5 },
+      { 0, 1 }
+    };
+
+  // Make sure it doesn't reallocate during insertion.
+  vv.reserve(4);
+
+  vv.insert(vv.begin(), vv[0]);
+
+  VERIFY( vv.size() == 4 );
+  VERIFY( vv[0].size() == 2 );
+  VERIFY( vv[0][0] == 2 );
+  VERIFY( vv[0][1] == 3 );
+}
+
+void test02()
+{
+  std::vector<std::vector<int>> vv =
+    {
+      { 2, 3 },
+      { 4, 5 },
+      { 0, 1 }
+    };
+
+  // Make sure we will reallocate for insertion.
+  VERIFY( vv.capacity() == 3 );
+
+  vv.insert(vv.begin(), vv[0]);
+
+  VERIFY( vv.size() == 4 );
+  VERIFY( vv[0].size() == 2 );
+  VERIFY( vv[0][0] == 2 );
+  VERIFY( vv[0][1] == 3 );
+}
+
+int main()
+{
+  test01();
+  test02();
+}