Start ICO by calling function functionality

[agnesenvaite]

I am analyzing features in publicly available ICO smart contracts as my Bachelor's thesis. In the thesis I am comparing how features in ICO smart contracts evolve naturally and in ICO libraries.

In my analysis I selected smart contracts labelled with "token sale" and having more then 700 transactions. Total count of such contracts was 161.

I selected 40 smart contracts which do not have token functionality (thesis scope was ICO smart contracts alone). I used selected smart contracts to create a feature model. Also, I created features model of TokenMarket ICO smart contracts. I compared them. One of the missing features is start ICO by calling function.

15% (6 of 40) of ICO smart contracts have start ICO by calling function functionality. I suggest creating StartableCrowdsale smart contract which extends CrowdsaleBase smart contract.

Proposed code for start ICO by calling function feature:

import "./CrowdsaleBase.sol";

contract StartableCrowdsale is CrowdsaleBase{

  event StartAtChanged(uint newStartAt);

  constructor  (address _token, PricingStrategy _pricingStrategy, 
  address _multisigWallet, uint _start, uint _end, uint _minimumFundingGoal)
    CrowdsaleBase (_token, _pricingStrategy, _multisigWallet, 
    _start, _end, _minimumFundingGoal) public{}
    /**
    * @dev Start Crowdsale
    */
    function startCrowdsale () public onlyOwner inState(State.PreFunding){
      startsAt = now;
      StartAtChanged(startsAt);
    }
}