Bools

This primitive data type can hold the values true or false.

Bool is convenient for boolean and logical operations. It is also useful for storing flags.

The only supported operations with booleans are && || ! - if you try to add them, for example, the code will not compile.

State costs

Persisting bools to state is very space-efficient, they only take 1-bit. Storing 1000 bools in state costs about 0.00072 TON per year.

All Examples

import "@stdlib/deploy";

// global constants are calculated in compile-time and can't change
const GlobalConst1: Int = 1000 + ton("1.24") + pow(10, 9);

contract Constants with Deployable {

    // contract constants are calculated in compile-time and can't change
    const ContractConst1: Int = 2000 + ton("1.25") + pow(10, 9);
    
    // if your contract can be in multiple states, constants are an easy alternative to enums
    const StateUnpaid: Int = 0;
    const StatePaid: Int = 1;
    const StateDelivered: Int = 2;
    const StateDisputed: Int = 3;

    init() {}

    get fun sum(): Int {
        // you can read the constants anywhere
        return GlobalConst1 + self.ContractConst1 + self.StatePaid;
    }
}