[PATCH 2/8] map: add helper functions for objects as keys

From

Jeff King <peff@peff.net>

Date

Aug 4, 2012, 17:10 UTC

Message-ID

<20120804171047.GB19378@sigill.intra.peff.net>

In-Reply-To

<20120804170905.GA19267@sigill.intra.peff.net>

Signed-off-by: Jeff King <peff@peff.net>
---
 Makefile     |  1 +
 map-object.h | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 map-object.h

diff --git a/Makefile b/Makefile
index d512f27..1d29a95 100644
--- a/Makefile
+++ b/Makefile
@@ -633,6 +633,7 @@ LIB_H += map-decl.h
 LIB_H += map-done.h
 LIB_H += map-impl.h
 LIB_H += map-init.h
+LIB_H += map-object.h
 LIB_H += merge-file.h
 LIB_H += merge-recursive.h
 LIB_H += mergesort.h
diff --git a/map-object.h b/map-object.h
new file mode 100644
index 0000000..4f98413
--- /dev/null
+++ b/map-object.h
@@ -0,0 +1,19 @@
+#ifndef MAP_OBJECT_H
+#define MAP_OBJECT_H
+
+#include "object.h"
+
+static unsigned int hash_obj(const struct object *obj, unsigned int n)
+{
+	unsigned int hash;
+
+	memcpy(&hash, obj->sha1, sizeof(unsigned int));
+	return hash % n;
+}
+
+static int obj_equal(const struct object *a, const struct object *b)
+{
+	return a == b;
+}
+
+#endif /* MAP_OBJECT_H */

-- 
1.7.12.rc1.7.g7a223a6