Simple Counter
Este es un contrato de un simple counter.
Así es como trabaja:
-
The contract has a state variable called 'counter' that is initialized to 0.
-
When a user calls 'increment', the contract increments the counter by 1.
-
When a user calls 'decrement', the contract decrements the counter by 1.
#[starknet::interface]
trait ISimpleCounter<TContractState> {
fn get_current_count(self: @TContractState) -> u128;
fn increment(ref self: TContractState);
fn decrement(ref self: TContractState);
}
#[starknet::contract]
mod SimpleCounter {
#[storage]
struct Storage {
// Counter variable
counter: u128,
}
#[constructor]
fn constructor(ref self: ContractState, init_value: u128) {
// Store initial value
self.counter.write(init_value);
}
#[abi(embed_v0)]
impl SimpleCounter of super::ISimpleCounter<ContractState> {
fn get_current_count(self: @ContractState) -> u128 {
return self.counter.read();
}
fn increment(ref self: ContractState) {
// Store counter value + 1
let counter = self.counter.read() + 1;
self.counter.write(counter);
}
fn decrement(ref self: ContractState) {
// Store counter value - 1
let counter = self.counter.read() - 1;
self.counter.write(counter);
}
}
}