Aleo Special Operands
The following lists show the special operands supported by Aleo instructions.
Table of Special Operands
| Name | Description |
|---|---|
| block.height | Returns height of the block within the finalize scope |
| self.signer | Returns the user address that originated the transition |
| self.caller | Returns the address of the immediate caller of the program |
| network.id | Returns the ID of the network on which the program is executed |
Specification
The following is the specification for each special operands in the Aleo Virtual Machine (AVM).
network.id
Description
Returns the ID of the network on which the program is executed. This can be useful for managing network-specific program behavior.
The network.id command must be called within a finalize block.
Currently supported network IDs are:
- 0: Mainnet
- 1: Testnet
- 2: Canarynet
Example Usage
assert.eq network.id 0u64; // For mainnet
block.height
Description
Returns the height of the block within the finalize scope.
The block.height command must be called within a finalize block.
Example Usage
assert.eq block.height 100u64;
self.signer
Description
Returns the user address that originated the transition.
Example Usage
assert.eq self.signer aleo1...;
self.caller
Description
Returns the address of the immediate caller of the program.
Example Usage
assert.eq self.caller aleo1...;