| // Copyright (c) HashiCorp, Inc. |
| // SPDX-License-Identifier: MPL-2.0 |
| |
| package states |
| |
| // Generation is used to represent multiple objects in a succession of objects |
| // represented by a single resource instance address. A resource instance can |
| // have multiple generations over its lifetime due to object replacement |
| // (when a change can't be applied without destroying and re-creating), and |
| // multiple generations can exist at the same time when create_before_destroy |
| // is used. |
| // |
| // A Generation value can either be the value of the variable "CurrentGen" or |
| // a value of type DeposedKey. Generation values can be compared for equality |
| // using "==" and used as map keys. The zero value of Generation (nil) is not |
| // a valid generation and must not be used. |
| type Generation interface { |
| generation() |
| } |
| |
| // CurrentGen is the Generation representing the currently-active object for |
| // a resource instance. |
| var CurrentGen Generation |
