Change hash_table to support a comparator type different from the value type stored in the hash table.

Change hash_table to support a comparator type different from the
value type stored in the hash table.  The 'find' functions now may
take a different type from the value type.  This requires introducing
a second typedef into the Descriptor conceptual type.  Change the
Descriptor concept to use typedefs value_type and compare_type instead
of T.  Change all users to match.

Add usage documentation to hash-table.h.

Tested on x86-64.


Index: gcc/ChangeLog

2012-10-25  Lawrence Crowl  <crowl@google.com>

	* hash-table.h: Add usage documentation.
	(template struct typed_free_remove): Clarify documentation. 
	Rename template parameter.
	(struct typed_noop_remove): Likewise.
	(descriptor concept): Change typedef T to value_type.
	Add typedef compare_type.  Use more precise template parameter name,
	Descriptor instead of Descr.  Update users to match.
	(struct hash_table): Change 'find' parameters to use compare_type
	instead of the value type.

From-SVN: r192823

1 files changed, 6 insertions, 5 deletions

diff --git a/gcc/objc/objc-act.c b/gcc/objc/objc-act.c
index cf0cc84..ed1a28f 100644
--- a/gcc/objc/objc-act.c
+++ b/gcc/objc/objc-act.c
@@ -3827,19 +3827,20 @@ objc_get_class_ivars (tree class_name)
 
 struct decl_name_hash : typed_noop_remove <tree_node>
 {
-  typedef tree_node T;
-  static inline hashval_t hash (const T *);
-  static inline bool equal (const T *, const T *);
+  typedef tree_node value_type;
+  typedef tree_node compare_type;
+  static inline hashval_t hash (const value_type *);
+  static inline bool equal (const value_type *, const compare_type *);
 };
 
 inline hashval_t
-decl_name_hash::hash (const T *q)
+decl_name_hash::hash (const value_type *q)
 {
   return (hashval_t) ((intptr_t)(DECL_NAME (q)) >> 3);
 }
 
 inline bool
-decl_name_hash::equal (const T *a, const T *b)
+decl_name_hash::equal (const value_type *a, const compare_type *b)
 {
   return DECL_NAME (a) == DECL_NAME (b);
 }