decorate: allow const objects to be decorated

We don't actually modify the struct object, so there is no
reason not to accept const versions (and this allows other
callsites, like the next patch, to use the decoration
machinery).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/decorate.c b/decorate.c
index d9668d2ef94c73e4a7a5602011ff13a9fd9d8c6a..82d9e221eabab53acc418d0db6327e480836a5ed 100644 (file)
--- a/decorate.c
+++ b/decorate.c
@@ -6,13 +6,13 @@
 #include "object.h"
 #include "decorate.h"
 
-static unsigned int hash_obj(struct object *obj, unsigned int n)
+static unsigned int hash_obj(const struct object *obj, unsigned int n)
 {
        unsigned int hash = *(unsigned int *)obj->sha1;
        return hash % n;
 }
 
-static void *insert_decoration(struct decoration *n, struct object *base, void *decoration)
+static void *insert_decoration(struct decoration *n, const struct object *base, void *decoration)
 {
        int size = n->size;
        struct object_decoration *hash = n->hash;
@@ -44,7 +44,7 @@ static void grow_decoration(struct decoration *n)
        n->nr = 0;
 
        for (i = 0; i < old_size; i++) {
-               struct object *base = old_hash[i].base;
+               const struct object *base = old_hash[i].base;
                void *decoration = old_hash[i].decoration;
 
                if (!base)
@@ -55,7 +55,8 @@ static void grow_decoration(struct decoration *n)
 }
 
 /* Add a decoration pointer, return any old one */
-void *add_decoration(struct decoration *n, struct object *obj, void *decoration)
+void *add_decoration(struct decoration *n, const struct object *obj,
+               void *decoration)
 {
        int nr = n->nr + 1;
 
@@ -65,7 +66,7 @@ void *add_decoration(struct decoration *n, struct object *obj, void *decoration)
 }
 
 /* Lookup a decoration pointer */
-void *lookup_decoration(struct decoration *n, struct object *obj)
+void *lookup_decoration(struct decoration *n, const struct object *obj)
 {
        int j;
 

diff --git a/decorate.h b/decorate.h
index 1fa4ad9beb08f23888814b99183487ab85378bfd..e7328044ff84a4acaaa7f5f4bc5f85375dc7a07a 100644 (file)
--- a/decorate.h
+++ b/decorate.h
@@ -2,7 +2,7 @@
 #define DECORATE_H
 
 struct object_decoration {
-       struct object *base;
+       const struct object *base;
        void *decoration;
 };
 
@@ -12,7 +12,7 @@ struct decoration {
        struct object_decoration *hash;
 };
 
-extern void *add_decoration(struct decoration *n, struct object *obj, void *decoration);
-extern void *lookup_decoration(struct decoration *n, struct object *obj);
+extern void *add_decoration(struct decoration *n, const struct object *obj, void *decoration);
+extern void *lookup_decoration(struct decoration *n, const struct object *obj);
 
 #endif