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graph: make state of empty less contradictory and provide debugging strings

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This commit is contained in:
Dan Kortschak
2020-11-25 13:47:53 +10:30
parent 609dabd3fa
commit 0430f3e693
1 changed files with 5 additions and 2 deletions
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7
graph/nodes_edges.go
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@@ -286,9 +286,9 @@ var (
_ WeightedLineSlicer = Empty
)
const nothing = empty(true)
const nothing = empty(0)
type empty bool
type empty int
func (empty) Next() bool { return false }
func (empty) Len() int { return 0 }
@@ -303,3 +303,6 @@ func (empty) Line() Line { return nil }
func (empty) LineSlice() []Line { return nil }
func (empty) WeightedLine() WeightedLine { return nil }
func (empty) WeightedLineSlice() []WeightedLine { return nil }
func (empty) String() string { return "<empty>" }
func (empty) GoString() string { return "graph.Empty" }