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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[T any] struct {
value T
changed func(T, T) bool
}
var _ VarValue = customVarValue[struct{}]{}
func (me customVarValue[T]) Changed(other VarValue) bool {
return me.changed(me.value, other.(customVarValue[T]).value)
}
func (me customVarValue[T]) Set(newValue interface{}) VarValue {
return customVarValue[T]{
value: newValue.(T),
changed: me.changed,
}
}
func (me customVarValue[T]) Get() interface{} {
return me.value
}
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