Move from an Object interface to a type

An Object should be about representing a libgit2 object rather than
showing which methods it should support.

Change any return of Object to *Object and provide methods to convert
between this and the particular type.

1 files changed, 3 insertions, 3 deletions

diff --git a/commit.go b/commit.go
index 52f7c01..6830da3 100644
--- a/commit.go
+++ b/commit.go
@@ -14,7 +14,7 @@ import (
 
 // Commit
 type Commit struct {
-	gitObject
+	Object
 	cast_ptr *C.git_commit
 }
 
@@ -37,7 +37,7 @@ func (c Commit) Tree() (*Tree, error) {
 		return nil, MakeGitError(err)
 	}
 
-	return allocObject((*C.git_object)(ptr), c.repo).(*Tree), nil
+	return allocTree(ptr, c.repo), nil
 }
 
 func (c Commit) TreeId() *Oid {
@@ -61,7 +61,7 @@ func (c *Commit) Parent(n uint) *Commit {
 		return nil
 	}
 
-	return allocObject((*C.git_object)(cobj), c.repo).(*Commit)
+	return allocCommit(cobj, c.repo)
 }
 
 func (c *Commit) ParentId(n uint) *Oid {