PR libstdc++/86292 fix exception safety of std::vector<InputIterator> constructor

	PR libstdc++/86292
	* include/bits/stl_vector.h (vector::_M_range_initialize<InputIter>):
	Add try-catch block.
	* testsuite/23_containers/vector/cons/86292.cc: New.

From-SVN: r262029

libstdc++-v3/ChangeLog

 2018-06-25  Jonathan Wakely  <jwakely@redhat.com>
 
+	PR libstdc++/86292
+	* include/bits/stl_vector.h (vector::_M_range_initialize<InputIter>):
+	Add try-catch block.
+	* testsuite/23_containers/vector/cons/86292.cc: New.
+
 	* doc/xml/manual/status_cxx2017.xml: Document N4531 status.
 
 	* include/experimental/algorithm (sample, shuffle): Add new overloads

libstdc++-v3/include/bits/stl_vector.h

@@ -1440,22 +1440,27 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
       // Called by the second initialize_dispatch above
       template<typename _InputIterator>
 	void
-	_M_range_initialize(_InputIterator __first,
-			    _InputIterator __last, std::input_iterator_tag)
+	_M_range_initialize(_InputIterator __first, _InputIterator __last,
+			    std::input_iterator_tag)
 	{
-	  for (; __first != __last; ++__first)
+	  __try {
+	    for (; __first != __last; ++__first)
 #if __cplusplus >= 201103L
-	    emplace_back(*__first);
+	      emplace_back(*__first);
 #else
-	    push_back(*__first);
+	      push_back(*__first);
 #endif
+	  } __catch(...) {
+	    clear();
+	    __throw_exception_again;
+	  }
 	}
 
       // Called by the second initialize_dispatch above
       template<typename _ForwardIterator>
 	void
-	_M_range_initialize(_ForwardIterator __first,
-			    _ForwardIterator __last, std::forward_iterator_tag)
+	_M_range_initialize(_ForwardIterator __first, _ForwardIterator __last,
+			    std::forward_iterator_tag)
 	{
 	  const size_type __n = std::distance(__first, __last);
 	  this->_M_impl._M_start = this->_M_allocate(__n);

libstdc++-v3/testsuite/23_containers/vector/cons/86292.cc

+// Copyright (C) 2018 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-do run }
+
+#include <vector>
+#include <testsuite_hooks.h>
+#include <testsuite_iterators.h>
+
+struct X
+{
+  X() { ++count; }
+  X(const X&) { if (++copies >= max_copies) throw 1; ++count; }
+  ~X() { --count; }
+
+  static int count;
+  static int copies;
+  static int max_copies;
+};
+
+int X::count = 0;
+int X::copies = 0;
+int X::max_copies = 0;
+
+void
+test01()
+{
+  X x[3];
+  const int count = X::count;
+  X::max_copies = 2;
+  __gnu_test::test_container<const X, __gnu_test::input_iterator_wrapper>
+    x_input(x, x+3);
+  bool caught = false;
+  try
+  {
+    std::vector<X> v(x_input.begin(), x_input.end());
+  }
+  catch(int)
+  {
+    caught = true;
+  }
+  VERIFY( caught );
+  VERIFY( X::count == count );
+}
+
+int
+main()
+{
+  test01();
+}