hashtable_policy.h (_Map_base::operator[], [...]): Simplify definitions with trailing return types.

	* include/bits/hashtable_policy.h (_Map_base::operator[],
	_Map_base::at): Simplify definitions with trailing return types.

From-SVN: r218416

libstdc++-v3/ChangeLog

+2014-12-05  Jonathan Wakely  <jwakely@redhat.com>
+
+	* include/bits/hashtable_policy.h (_Map_base::operator[],
+	_Map_base::at): Simplify definitions with trailing return types.
+
 2014-12-04  Tim Shen  <timshen@google.com>
 
 	PR libstdc++/64140

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

@@ -584,12 +584,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Key, typename _Pair, typename _Alloc, typename _Equal,
 	   typename _H1, typename _H2, typename _Hash,
 	   typename _RehashPolicy, typename _Traits>
-    typename _Map_base<_Key, _Pair, _Alloc, _Select1st, _Equal,
-		       _H1, _H2, _Hash, _RehashPolicy, _Traits, true>
-		       ::mapped_type&
+    auto
     _Map_base<_Key, _Pair, _Alloc, _Select1st, _Equal,
 	      _H1, _H2, _Hash, _RehashPolicy, _Traits, true>::
     operator[](const key_type& __k)
+    -> mapped_type&
     {
       __hashtable* __h = static_cast<__hashtable*>(this);
       __hash_code __code = __h->_M_hash_code(__k);
@@ -610,12 +609,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Key, typename _Pair, typename _Alloc, typename _Equal,
 	   typename _H1, typename _H2, typename _Hash,
 	   typename _RehashPolicy, typename _Traits>
-    typename _Map_base<_Key, _Pair, _Alloc, _Select1st, _Equal,
-		       _H1, _H2, _Hash, _RehashPolicy, _Traits, true>
-		       ::mapped_type&
+    auto
     _Map_base<_Key, _Pair, _Alloc, _Select1st, _Equal,
 	      _H1, _H2, _Hash, _RehashPolicy, _Traits, true>::
     operator[](key_type&& __k)
+    -> mapped_type&
     {
       __hashtable* __h = static_cast<__hashtable*>(this);
       __hash_code __code = __h->_M_hash_code(__k);
@@ -636,12 +634,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Key, typename _Pair, typename _Alloc, typename _Equal,
 	   typename _H1, typename _H2, typename _Hash,
 	   typename _RehashPolicy, typename _Traits>
-    typename _Map_base<_Key, _Pair, _Alloc, _Select1st, _Equal,
-		       _H1, _H2, _Hash, _RehashPolicy, _Traits, true>
-		       ::mapped_type&
+    auto
     _Map_base<_Key, _Pair, _Alloc, _Select1st, _Equal,
 	      _H1, _H2, _Hash, _RehashPolicy, _Traits, true>::
     at(const key_type& __k)
+    -> mapped_type&
     {
       __hashtable* __h = static_cast<__hashtable*>(this);
       __hash_code __code = __h->_M_hash_code(__k);
@@ -656,12 +653,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Key, typename _Pair, typename _Alloc, typename _Equal,
 	   typename _H1, typename _H2, typename _Hash,
 	   typename _RehashPolicy, typename _Traits>
-    const typename _Map_base<_Key, _Pair, _Alloc, _Select1st,
-			     _Equal, _H1, _H2, _Hash, _RehashPolicy,
-			     _Traits, true>::mapped_type&
+    auto
     _Map_base<_Key, _Pair, _Alloc, _Select1st, _Equal,
 	      _H1, _H2, _Hash, _RehashPolicy, _Traits, true>::
     at(const key_type& __k) const
+    -> const mapped_type&
     {
       const __hashtable* __h = static_cast<const __hashtable*>(this);
       __hash_code __code = __h->_M_hash_code(__k);