LinearPointer.<init> - corda

corda / net.corda.core.contracts / LinearPointer / <init>

# <init>

`LinearPointer(pointer: UniqueIdentifier, type: Class<T>)`

Allows this class to be evolved through backwards compatibility with version 1 of this class.

### Parameters

`pointer` - The unique identifier that this points to.

`type` - The underlying LinearState type that this points to.

`LinearPointer(pointer: UniqueIdentifier, type: Class<T>, isResolved: Boolean = true)`

LinearPointer allows a ContractState to "point" to another LinearState creating a "many-to-one" relationship between all the states containing the pointer to a particular LinearState and the LinearState being pointed to. Using the LinearPointer is useful when one state depends on the data contained within another state that evolves independently. When using LinearPointer it is worth noting:

- The node performing the resolution may not have seen any LinearStates with the specified linearId, as such the vault query in resolve will return null and resolve will throw an exception
- The node performing the resolution may not have the latest version of the LinearState and therefore will return an older version of the LinearState. As the pointed-to state will be added as a reference state to the transaction then the transaction with such a reference state cannot be committed to the ledger until the most up-to-date version of the LinearState is available. See reference states documentation on docs.corda.net for more info.