Return the index of the added element

feed.go

@@ -35,10 +35,10 @@ func NewFeed(title string) *Feed {
 	}
 }
 
-// AddAuthor adds the Person as an author to the Feed.
-func (f *Feed) AddAuthor(p *Person) {
-	addToSlice(&f.Authors, p)
+// AddAuthor adds the Person as an author to the Feed. It returns an int.
+func (f *Feed) AddAuthor(p *Person) int {
 	f.Updated = NewDate(time.Now())
+	return addToSlice(&f.Authors, p)
 }
 
 // DeleteAuthor deletes the Person at index from the Feed. It return an error.
@@ -51,10 +51,10 @@ func (f *Feed) DeleteAuthor(index int) error {
 	return nil
 }
 
-// AddCategory adds the Category to the Feed.
-func (f *Feed) AddCategory(c *Category) {
-	addToSlice(&f.Categories, c)
+// AddCategory adds the Category to the Feed. It returns an int.
+func (f *Feed) AddCategory(c *Category) int {
 	f.Updated = NewDate(time.Now())
+	return addToSlice(&f.Categories, c)
 }
 
 // DeleteCategory deletes the Category at index from the Feed. It return an
@@ -68,10 +68,11 @@ func (f *Feed) DeleteCategory(index int) error {
 	return nil
 }
 
-// AddContributor adds the Person as a contributor to the Feed.
-func (f *Feed) AddContributor(c *Person) {
-	addToSlice(&f.Contributors, c)
+// AddContributor adds the Person as a contributor to the Feed. It returns an
+// int.
+func (f *Feed) AddContributor(c *Person) int {
 	f.Updated = NewDate(time.Now())
+	return addToSlice(&f.Contributors, c)
 }
 
 // DeleteContributor deletes the Person at index from the Feed. It return an
@@ -86,9 +87,10 @@ func (f *Feed) DeleteContributor(index int) error {
 }
 
 // AddLink adds the Link to the Feed. There should be one Link with Rel "self".
-func (f *Feed) AddLink(l *Link) {
-	addToSlice(&f.Links, l)
+// It returns an int.
+func (f *Feed) AddLink(l *Link) int {
 	f.Updated = NewDate(time.Now())
+	return addToSlice(&f.Links, l)
 }
 
 // DeleteLink deletes the Link at index from the Feed. It return an error.
@@ -101,10 +103,10 @@ func (f *Feed) DeleteLink(index int) error {
 	return nil
 }
 
-// AddExtension adds the Extension to the Feed.
-func (f *Feed) AddExtension(e *ExtensionElement) {
-	addToSlice(&f.Extensions, e)
+// AddExtension adds the Extension to the Feed. It returns an int.
+func (f *Feed) AddExtension(e *ExtensionElement) int {
 	f.Updated = NewDate(time.Now())
+	return addToSlice(&f.Extensions, e)
 }
 
 // DeleteExtension deletes the Extension at index from the Feed. It return an
@@ -118,10 +120,10 @@ func (f *Feed) DeleteExtension(index int) error {
 	return nil
 }
 
-// AddEntry adds the Entry to the Feed.
-func (f *Feed) AddEntry(e *Entry) {
-	addToSlice(&f.Entries, e)
+// AddEntry adds the Entry to the Feed. It returns an int.
+func (f *Feed) AddEntry(e *Entry) int {
 	f.Updated = NewDate(time.Now())
+	return addToSlice(&f.Entries, e)
 }
 
 // DeleteEntry deletes the Entry at index from the Feed. It return an error.