25 lines
928 B
Go
25 lines
928 B
Go
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package states
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// Generation is used to represent multiple objects in a succession of objects
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// represented by a single resource instance address. A resource instance can
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// have multiple generations over its lifetime due to object replacement
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// (when a change can't be applied without destroying and re-creating), and
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// multiple generations can exist at the same time when create_before_destroy
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// is used.
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//
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// A Generation value can either be the value of the variable "CurrentGen" or
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// a value of type DeposedKey. Generation values can be compared for equality
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// using "==" and used as map keys. The zero value of Generation (nil) is not
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// a valid generation and must not be used.
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type Generation interface {
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generation()
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}
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// CurrentGen is the Generation representing the currently-active object for
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// a resource instance.
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var CurrentGen Generation
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type currentGen struct{}
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func (g currentGen) generation() {}
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