PR 57779 New debug check

[Paolo Carlini]

... applied this.

Thanks,
Paolo.

//////////////////
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2013-08-02  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/58049
	* include/debug/functions.h: Include <bits/move.h>; minor formatting
	changes.
	(__foreign_iterator_aux4): Declare __l and __ge constexpr.
	* include/debug/safe_iterator.h (_Safe_iterator<>::operator->):
	Use __addressof.
	* include/debug/safe_local_iterator.h (_Safe_local_iterator<>::
	operator->): Likewise.
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Index: include/debug/functions.h
===================================================================
--- include/debug/functions.h	(revision 201423)
+++ include/debug/functions.h	(working copy)
@@ -33,6 +33,7 @@
 #include <bits/stl_iterator_base_types.h> // for iterator_traits, categories and
 					  // _Iter_base
 #include <bits/cpp_type_traits.h>	  // for __is_integer
+#include <bits/move.h>                    // for __addressof and addressof
 #if __cplusplus >= 201103L
 # include <bits/stl_function.h>		  // for less and greater_equal
 # include <type_traits>			  // for common_type
@@ -126,8 +127,8 @@
     inline bool
     __valid_range_aux(const _InputIterator& __first,
 		      const _InputIterator& __last, std::__false_type)
-  { return __valid_range_aux2(__first, __last,
-			      std::__iterator_category(__first)); }
+    { return __valid_range_aux2(__first, __last,
+				std::__iterator_category(__first)); }
 
   /** Don't know what these iterators are, or if they are even
    *  iterators (we may get an integral type for InputIterator), so
@@ -182,15 +183,14 @@
     {
       typedef typename std::common_type<_PointerType1,
 					_PointerType2>::type _PointerType;
-      std::less<_PointerType> __l;
-      std::greater_equal<_PointerType> __ge;
+      constexpr std::less<_PointerType> __l;
+      constexpr std::greater_equal<_PointerType> __ge;
 
-      return
-	__l(std::addressof(*__other),
-	    std::addressof(*(__it._M_get_sequence()->_M_base().begin())))
-	|| __ge(std::addressof(*__other),
-		std::addressof(*(__it._M_get_sequence()->_M_base().end() - 1)) + 1);
-      
+      return (__l(std::addressof(*__other),
+		  std::addressof(*(__it._M_get_sequence()->_M_base().begin())))
+	      || __ge(std::addressof(*__other),
+		      std::addressof(*(__it._M_get_sequence()->_M_base().end()
+				       - 1)) + 1));
     }
 			  
   template<typename _Iterator, typename _Sequence, typename _InputIterator>
@@ -205,12 +205,13 @@
       // past-the-end iterator.
       if (__it._M_get_sequence()->_M_base().begin()
 	  != __it._M_get_sequence()->_M_base().end())
-	if (std::__addressof(*(__it._M_get_sequence()->_M_base().end() - 1))
-	    - std::__addressof(*(__it._M_get_sequence()->_M_base().begin()))
+	if (std::addressof(*(__it._M_get_sequence()->_M_base().end() - 1))
+	    - std::addressof(*(__it._M_get_sequence()->_M_base().begin()))
 	    == __it._M_get_sequence()->size() - 1)
-	  return __foreign_iterator_aux4(__it, __other,
-			std::addressof(*(__it._M_get_sequence()->_M_base().begin())),
-			std::addressof(*__other));
+	  return (__foreign_iterator_aux4
+		  (__it, __other,
+		   std::addressof(*(__it._M_get_sequence()->_M_base().begin())),
+		   std::addressof(*__other)));
       return true;
     }
 			   
@@ -232,8 +233,8 @@
     { return __it._M_get_sequence() != __other._M_get_sequence(); }
 			   
 #if __cplusplus >= 201103L
-  /* This overload detects when passing pointers to the contained elements rather
-     than using iterators.
+  /* This overload detects when passing pointers to the contained elements
+     rather than using iterators.
    */
   template<typename _Iterator, typename _Sequence, typename _InputIterator>
     inline bool
@@ -271,10 +272,9 @@
 			   _InputIterator __other,
 			   std::__false_type)
     {
-      return
-	_Insert_range_from_self_is_safe<_Sequence>::__value
-	|| __foreign_iterator_aux2(__it, __other,
-				   std::__iterator_category(__it));
+      return (_Insert_range_from_self_is_safe<_Sequence>::__value
+	      || __foreign_iterator_aux2(__it, __other,
+					 std::__iterator_category(__it)));
     }
 
   template<typename _Iterator, typename _Sequence,
Index: include/debug/safe_iterator.h
===================================================================
--- include/debug/safe_iterator.h	(revision 201423)
+++ include/debug/safe_iterator.h	(working copy)
@@ -269,7 +269,6 @@
        *  @brief Iterator dereference.
        *  @pre iterator is dereferenceable
        *  @todo Make this correct w.r.t. iterators that return proxies
-       *  @todo Use addressof() instead of & operator
        */
       pointer
       operator->() const
@@ -277,7 +276,7 @@
 	_GLIBCXX_DEBUG_VERIFY(this->_M_dereferenceable(),
 			      _M_message(__msg_bad_deref)
 			      ._M_iterator(*this, "this"));
-	return &*_M_current;
+	return std::__addressof(*_M_current);
       }
 
       // ------ Input iterator requirements ------
Index: include/debug/safe_local_iterator.h
===================================================================
--- include/debug/safe_local_iterator.h	(revision 201423)
+++ include/debug/safe_local_iterator.h	(working copy)
@@ -173,7 +173,6 @@
        *  @brief Iterator dereference.
        *  @pre iterator is dereferenceable
        *  @todo Make this correct w.r.t. iterators that return proxies
-       *  @todo Use addressof() instead of & operator
        */
       pointer
       operator->() const
@@ -181,7 +180,7 @@
 	_GLIBCXX_DEBUG_VERIFY(this->_M_dereferenceable(),
 			      _M_message(__msg_bad_deref)
 			      ._M_iterator(*this, "this"));
-	return &*_M_current;
+	return std::__addressof(*_M_current);
       }
 
       // ------ Input iterator requirements ------