barak/cayley
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

Base nexting on interface satisfaction

Browse source 
This is done unsubtlely at the moment and there is plenty of room for
optimisation of assertion location to prevent repeated reasserting as is
done now.
This commit is contained in:
kortschak 2014-07-30 16:06:46 +09:30
parent b498a06a7b
commit d6f94be514
27 changed files with 57 additions and 82 deletions
Download patch file Download diff file Expand all files Collapse all files

13
graph/iterator/iterator.go
View file

@ -14,8 +14,7 @@
package iterator
// Define the general iterator interface, as well as the Base which all
// iterators can "inherit" from to get default iterator functionality.
// Define the general iterator interface.
import (
"strings"
@ -30,14 +29,6 @@ func NextUID() uint64 {
return atomic.AddUint64(&nextIteratorID, 1) - 1
}
// The Base iterator is the iterator other iterators inherit from to get some
// default functionality.
type Base struct {
}
// Accessor
func (it *Base) CanNext() bool { return true }
// Here we define the simplest iterator -- the Null iterator. It contains nothing.
// It is the empty set. Often times, queries that contain one of these match nothing,
// so it's important to give it a special iterator.
@ -88,8 +79,6 @@ func (it *Null) DebugString(indent int) string {
return strings.Repeat(" ", indent) + "(null)"
}
func (it *Null) CanNext() bool { return true }
func (it *Null) Next() (graph.Value, bool) {
return nil, false
}