Counter

The following example implements a counter which is able to:

• Increment the count by 1
• Decrement the count by 1
• Retrieve the value of the counter

ABI

To create a counter we must define an ABI which exposes methods that manipulate the count and retrieve its value. Since we are handling storage we must provide storage annotations on the functions.

{{#include ../../code/examples/counter/src/main.sw:abi}}

Implementation

We initialize a count in storage with the value of zero and implement methods to increment & decrement the count by one and return the value.

{{#include ../../code/examples/counter/src/main.sw:counter}}