fix libstdc++/52433

[Jonathan Wakely]

On 4 March 2012 12:56, Jonathan Wakely wrote:
>        PR libstdc++/52433
>        * include/debug/safe_iterator.h (_Safe_iterator): Add move
>        constructor and move assignment operator.
>        * testsuite/23_containers/vector/debug/52433.cc: New.
>
> Tested 'make check check-debug' on x86_64 and committed to trunk.  I
> plan to fix this for 4.7.1 and 4.6.4 as well

This restores the debug mode checks when moving singular iterators.

Tested x86_64-linux, committed to trunk.
-------------- next part --------------
commit 9ada43f026087d440ed6e70d007b51c497d4b790
Author: Jonathan Wakely <jwakely.gcc@gmail.com>
Date:   Wed Mar 7 01:24:45 2012 +0000

    	PR libstdc++/52433
    	* include/debug/safe_iterator.h (_Safe_iterator): Add debug checks
    	to move constructor and move assignment operator.

diff --git a/libstdc++-v3/include/debug/safe_iterator.h b/libstdc++-v3/include/debug/safe_iterator.h
index 65dff55..6bb3cd2 100644
--- a/libstdc++-v3/include/debug/safe_iterator.h
+++ b/libstdc++-v3/include/debug/safe_iterator.h
@@ -1,6 +1,6 @@
 // Safe iterator implementation  -*- C++ -*-
 
-// Copyright (C) 2003, 2004, 2005, 2006, 2009, 2010, 2011
+// Copyright (C) 2003, 2004, 2005, 2006, 2009, 2010, 2011, 2012
 // Free Software Foundation, Inc.
 //
 // This file is part of the GNU ISO C++ Library.  This library is free
@@ -176,6 +176,11 @@ namespace __gnu_debug
        */
       _Safe_iterator(_Safe_iterator&& __x) : _M_current()
       {
+	_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
+			      || __x._M_current == _Iterator(),
+			      _M_message(__msg_init_copy_singular)
+			      ._M_iterator(*this, "this")
+			      ._M_iterator(__x, "other"));
 	std::swap(_M_current, __x._M_current);
 	this->_M_attach(__x._M_sequence);
 	__x._M_detach();
@@ -229,6 +234,11 @@ namespace __gnu_debug
       _Safe_iterator&
       operator=(_Safe_iterator&& __x)
       {
+	_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
+			      || __x._M_current == _Iterator(),
+			      _M_message(__msg_copy_singular)
+			      ._M_iterator(*this, "this")
+			      ._M_iterator(__x, "other"));
 	_M_current = __x._M_current;
 	_M_attach(__x._M_sequence);
 	__x._M_detach();