Simplify Nexter interface

This change allows a Nexter to be used in the same manner as a scanner
using a for graph.Next(it) {} construction.

It is important that graph.Next(it) and any associated it.Result() calls
operate on the same iterator.
This commit is contained in:
kortschak 2014-08-01 09:15:02 +09:30
parent f8e28e066e
commit b1a70d99aa
31 changed files with 168 additions and 233 deletions

View file

@ -79,8 +79,8 @@ func (it *Null) DebugString(indent int) string {
return strings.Repeat(" ", indent) + "(null)"
}
func (it *Null) Next() (graph.Value, bool) {
return nil, false
func (it *Null) Next() bool {
return false
}
func (it *Null) Result() graph.Value {