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32 lines
687 B
Go
32 lines
687 B
Go
package graph
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type ID string
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// Delta represent the changes a Node made to its follow list.
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// It Removed some nodes, and Added some others.
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// This means the old follow list is Removed + Common, while the new is Common + Added
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type Delta struct {
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Node ID
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Removed []ID
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Common []ID
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Added []ID
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}
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func (d Delta) Old() []ID {
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return append(d.Common, d.Removed...)
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}
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func (d Delta) New() []ID {
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return append(d.Common, d.Added...)
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}
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// Inverse of the delta. If a delta and it's inverse are applied, the graph returns to its original state.
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func (d Delta) Inverse() Delta {
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return Delta{
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Node: d.Node,
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Common: d.Common,
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Removed: d.Added,
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Added: d.Removed,
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}
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}
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