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43 lines
1.0 KiB
43 lines
1.0 KiB
pragma solidity ^0.4.23;
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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 Crowdsale with a limit for total contributions.
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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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/**
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* @dev Constructor, takes maximum amount of wei accepted in the crowdsale.
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* @param _cap Max amount of wei to be contributed
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*/
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constructor(uint256 _cap) public {
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require(_cap > 0);
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cap = _cap;
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}
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/**
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* @dev Checks whether the cap has been reached.
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* @return Whether the cap was reached
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*/
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function capReached() public view returns (bool) {
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return weiRaised >= cap;
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}
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/**
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* @dev Extend parent behavior requiring purchase to respect the funding cap.
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* @param _beneficiary Token purchaser
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* @param _weiAmount Amount of wei contributed
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*/
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function _preValidatePurchase(address _beneficiary, uint256 _weiAmount) internal {
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super._preValidatePurchase(_beneficiary, _weiAmount);
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require(weiRaised.add(_weiAmount) <= cap);
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}
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}
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