49 lines
1.3 KiB
Solidity
49 lines
1.3 KiB
Solidity
pragma solidity ^0.5.0;
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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 private _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, "CappedCrowdsale: cap is 0");
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_cap = cap;
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}
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/**
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* @return the cap of the crowdsale.
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*/
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function cap() public view returns (uint256) {
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return _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 view {
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super._preValidatePurchase(beneficiary, weiAmount);
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require(weiRaised().add(weiAmount) <= _cap, "CappedCrowdsale: cap exceeded");
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}
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}
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