Using a crowdsale contract, how to mint token in another token contract?

Question

I'm trying to create a crowdsale contract with open-zeppelin. I'm using SampleCrowdsale.sol. I believe the following line of code creates a token contract and mints the token upon receiving ether.

function createTokenContract() internal returns (MintableToken) {
    return new SampleCrowdsaleToken();
  }

However, I rather want the crowdsale contract to mint a token in another mintable token contract. Is there any way the crowdsale contract can interact with an external token contract? Any suggestion or code snippet would be really helpful.

Answer 1

Yes what you need to do is first create your token in a separate contract. Then when you create your crowdsale you pass in the constructor the address of your token.

This is a sample taken from the Ethereum Crowdfund your idea

pragma solidity ^0.4.16;

interface token {
    function mintToken(address receiver, uint amount);
}

contract Crowdsale {
    token public tokenReward;

    /**
     * Constrctor function
     */
    function Crowdsale(
        address addressOfTokenUsedAsReward
    ) {
        tokenReward = token(addressOfTokenUsedAsReward);
    }
}