Importing Contracts

Question

I am just struggling to understand why the constructor is done like it is and what is it doing?

I am trying to implement something similar as am looking to find the address of the contract, called DiceGame in this example.

Answer 1

Here, the constructor is asking for an address called diceGameAddress which will, hopefully, will be deployed DiceGame contract.

Now the line diceGame = DiceGame(diceGameAddress) is actually creating an instance of this deployed contract in this contract to be used later.

And finally, the address is being updated in the dice variable.

Answer 2

Your constructor should be

contract RidgeRoll is Ownable {
    DiceGame public diceGame;

    constructor(DiceGame diceGameAddress) {
        diceGame = diceGameAddress;
    }
}

then you can the functions of DiceGame inside RidgeRoll like this :

function use() public {
    diceGame.functionToUse();
}