Call a Contract

A common blockchain operation is communication between smart contracts.

Example

To perform a call there are three steps that we must take:

1. Provide an interface to call
2. Create a type that allows us to make a call
3. Call a function on our interface

Defining the Interface

Let's take the example of a Vault to demonstrate how a call can be performed.

{{#include ../../code/operations/contract_calling/contract_interface/src/lib.sw}}

Creating a Callable Type

To call a function on our Vault we must create a type that can perform calls. The syntax for creating a callable type is: abi(<interface-name>, <b256-address>).

Calling a Contract

The following snippet uses a script to call our Vault contract.

{{#include ../../code/operations/contract_calling/call/src/main.sw}}

The deposit() function uses pre-defined optional arguments provided by the Sway language.