simplebank-destructible.sol

pragma solidity ^0.4.24;

import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/lifecycle/Destructible.sol";

contract SimpleBank is Destructible {

    mapping (address => uint) private balances;

    address public owner;

    event LogDepositMade(address accountAddress, uint amount);

    constructor() public {
        owner = msg.sender;
    }

    function deposit() public payable returns (uint) {

		require((balances[msg.sender] + msg.value) >= balances[msg.sender]);
	
        balances[msg.sender] += msg.value;

        emit LogDepositMade(msg.sender, msg.value);

        return balances[msg.sender];
    }

    function balance() constant public returns (uint) {
        return balances[msg.sender];
    }
}