29 lines
619 B
Go
29 lines
619 B
Go
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package uio
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import "io"
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// Cycler stores any io.Closer. When the value is replaced, the old value is
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// closed.
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type Cycler struct {
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value io.Closer
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}
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// Value returns the value of the Cycler. If there is no value, nil is returned.
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func (this *Cycler) Value () io.Closer {
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return this.value
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}
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// Set replaces the value of the Cycler, closing the previous one if it exists.
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func (this *Cycler) Set (value io.Closer) error {
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err := this.value.Close()
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this.value = value
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return err
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}
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// Close closes the Cycler's value early. It will be set to nil.
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func (this *Cycler) Close () error {
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return this.Set(nil)
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}
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