re PR libstdc++/51209 (The template _M_find_node in hashtable.h has a bad return value)

2011-11-18  Harti Brandt  <hartmut.brandt@dlr.de>

	PR libstdc++/51209
	* include/bits/hashtable.h (_Hashtable<>::_M_find_node): Return
	nullptr when no node is found.
	* include/tr1/hashtable.h (_Hashtable<>::_M_find_node): Return
	zero when no node is found.

From-SVN: r181480

libstdc++-v3/ChangeLog

+2011-11-18  Harti Brandt  <hartmut.brandt@dlr.de>
+
+	PR libstdc++/51209
+	* include/bits/hashtable.h (_Hashtable<>::_M_find_node): Return
+	nullptr when no node is found.
+	* include/tr1/hashtable.h (_Hashtable<>::_M_find_node): Return
+	zero when no node is found.
+
 2011-11-18  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* src/hash-long-double-aux.cc: Rename to...

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

@@ -873,7 +873,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     }
 
   // Find the node whose key compares equal to k, beginning the search
-  // at p (usually the head of a bucket).  Return nil if no node is found.
+  // at p (usually the head of a bucket).  Return nullptr if no node is found.
   template<typename _Key, typename _Value,
 	   typename _Allocator, typename _ExtractKey, typename _Equal,
 	   typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
@@ -889,7 +889,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       for (; __p; __p = __p->_M_next)
 	if (this->_M_compare(__k, __code, __p))
 	  return __p;
-      return false;
+      return nullptr;
     }
 
   // Insert v in bucket n (assumes no element with its key already present).

libstdc++-v3/include/tr1/hashtable.h

@@ -813,7 +813,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     }
 
   // Find the node whose key compares equal to k, beginning the search
-  // at p (usually the head of a bucket).  Return nil if no node is found.
+  // at p (usually the head of a bucket).  Return zero if no node is found.
   template<typename _Key, typename _Value,
 	   typename _Allocator, typename _ExtractKey, typename _Equal,
 	   typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
@@ -829,7 +829,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       for (; __p; __p = __p->_M_next)
 	if (this->_M_compare(__k, __code, __p))
 	  return __p;
-      return false;
+      return 0;
     }
 
   // Insert v in bucket n (assumes no element with its key already present).