How to combine two ERC20 contracts

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15

Hi @crypto_economics,

I suggest looking at the following example. You need to deploy both contracts and then transfer the amount you want to sell of SimpleToken to the Crowdsale.

You should do appropriate testing, and auditing. You should also get appropriate regulatory advice for any token. (see: Points to consider when creating a fungible token (ERC20, ERC777))

SimpleToken

pragma solidity ^0.5.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20Detailed.sol";

/**
 * @title SimpleToken
 * @dev Very simple ERC20 Token example, where all tokens are pre-assigned to the creator.
 * Note they can later distribute these tokens as they wish using `transfer` and other
 * `ERC20` functions.
 */
contract SimpleToken is Context, ERC20, ERC20Detailed {

    /**
     * @dev Constructor that gives _msgSender() all of existing tokens.
     */
    constructor () public ERC20Detailed("SimpleToken", "SIM", 18) {
        _mint(_msgSender(), 1000000 * (10 ** uint256(decimals())));
    }
}

SimpleCrowdsale

pragma solidity ^0.5.0;

import "@openzeppelin/contracts/crowdsale/Crowdsale.sol";


/**
 * @title SimpleCrowdsale
 * @dev This is an example of a fully fledged crowdsale.
 */
contract SimpleCrowdsale is Crowdsale {
    constructor (
        uint256 rate,
        address payable wallet,
        IERC20 token
    )
        public
        Crowdsale(rate, wallet, token)
    {
    }
}
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