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