Counter
The following is a simple example of a contract which implements a counter. Both the initialize_counter()
and increment_counter()
ABI methods return the currently set value.
forc template --template-name counter my_counter_project
contract;
abi TestContract {
#[storage(write)]fn initialize_counter(value: u64) -> u64;
#[storage(read, write)]fn increment_counter(amount: u64) -> u64;
}
storage {
counter: u64,
}
impl TestContract for Contract {
#[storage(write)]fn initialize_counter(value: u64) -> u64 {
storage.counter = value;
value
}
#[storage(read, write)]fn increment_counter(amount: u64) -> u64 {
let incremented = storage.counter + amount;
storage.counter = incremented;
incremented
}
}