Interface Calculator

tests/binary/traits/src/main.rs:1–13

trait Calculator {
    // Performs a primary calculation
    fn calculate(&self, a: i32, b: i32) -> i32;

    // Modifies internal state based on input
    fn accumulate(&mut self, value: i32);

    // Returns the current internal state
    fn get_value(&self) -> i32;

    // Returns an identifier for the calculator type
    fn id(&self) -> u8;
}

trait CarrierValue {
    fn carrier_value(self) -> i32;