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