5 files changed, 21 insertions, 0 deletions
diff --git a/blob.go b/blob.go
index 5235597..227e014 100644
--- a/blob.go
+++ b/blob.go
@@ -20,6 +20,10 @@ type Blob struct {
 	cast_ptr *C.git_blob
 }
 
+func (b *Blob) AsObject() *Object {
+	return &b.Object
+}
+
 func (v *Blob) Size() int64 {
 	ret := int64(C.git_blob_rawsize(v.cast_ptr))
 	runtime.KeepAlive(v)
diff --git a/commit.go b/commit.go
index 5aa5f25..223b093 100644
--- a/commit.go
+++ b/commit.go
@@ -18,6 +18,10 @@ type Commit struct {
 	cast_ptr *C.git_commit
 }
 
+func (c *Commit) AsObject() *Object {
+	return &c.Object
+}
+
 func (c *Commit) Message() string {
 	ret := C.GoString(C.git_commit_message(c.cast_ptr))
 	runtime.KeepAlive(c)
diff --git a/object.go b/object.go
index f4f1b3e..5505e35 100644
--- a/object.go
+++ b/object.go
@@ -26,6 +26,11 @@ type Object struct {
 	repo *Repository
 }
 
+// Objecter lets us accept any kind of Git object in functions.
+type Objecter interface {
+	AsObject() *Object
+}
+
 func (t ObjectType) String() string {
 	switch t {
 	case ObjectAny:
diff --git a/tag.go b/tag.go
index a58b090..9e26174 100644
--- a/tag.go
+++ b/tag.go
@@ -17,6 +17,10 @@ type Tag struct {
 	cast_ptr *C.git_tag
 }
 
+func (t *Tag) AsObject() *Object {
+	return &t.Object
+}
+
 func (t Tag) Message() string {
 	ret := C.GoString(C.git_tag_message(t.cast_ptr))
 	runtime.KeepAlive(t)
diff --git a/tree.go b/tree.go
index f5cbd78..ee14ec5 100644
--- a/tree.go
+++ b/tree.go
@@ -27,6 +27,10 @@ type Tree struct {
 	cast_ptr *C.git_tree
 }
 
+func (t *Tree) AsObject() *Object {
+	return &t.Object
+}
+
 type TreeEntry struct {
 	Name     string
 	Id       *Oid