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package stm
type VarValue interface {
Set(interface{}) VarValue
Get() interface{}
Changed(VarValue) bool
}
type version uint64
type versionedValue struct {
value interface{}
version version
}
func (me versionedValue) Set(newValue interface{}) VarValue {
return versionedValue{
value: newValue,
version: me.version + 1,
}
}
func (me versionedValue) Get() interface{} {
return me.value
}
func (me versionedValue) Changed(other VarValue) bool {
return me.version != other.(versionedValue).version
}
type customVarValue struct {
value interface{}
changed func(interface{}, interface{}) bool
}
var _ VarValue = customVarValue{}
func (me customVarValue) Changed(other VarValue) bool {
return me.changed(me.value, other.(customVarValue).value)
}
func (me customVarValue) Set(newValue interface{}) VarValue {
return customVarValue{
value: newValue,
changed: me.changed,
}
}
func (me customVarValue) Get() interface{} {
return me.value
}
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