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34 lines
892 B
34 lines
892 B
pragma solidity ^0.4.11;
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import '../math/SafeMath.sol';
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import './Crowdsale.sol';
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/**
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* @title CappedCrowdsale
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* @dev Extension of Crowsdale with a max amount of funds raised
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*/
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contract CappedCrowdsale is Crowdsale {
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using SafeMath for uint256;
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uint256 public cap;
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function CappedCrowdsale(uint256 _cap) {
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require(_cap > 0);
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cap = _cap;
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}
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// overriding Crowdsale#validPurchase to add extra cap logic
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// @return true if investors can buy at the moment
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function validPurchase() internal constant returns (bool) {
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bool withinCap = weiRaised.add(msg.value) <= cap;
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return super.validPurchase() && withinCap;
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}
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// overriding Crowdsale#hasEnded to add cap logic
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// @return true if crowdsale event has ended
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function hasEnded() public constant returns (bool) {
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bool capReached = weiRaised >= cap;
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return super.hasEnded() || capReached;
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}
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}
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