43 lines
1020 B
Solidity
43 lines
1020 B
Solidity
pragma solidity ^0.4.24;
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import "../validation/TimedCrowdsale.sol";
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import "../../token/ERC20/ERC20.sol";
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import "../../math/SafeMath.sol";
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/**
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* @title PostDeliveryCrowdsale
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* @dev Crowdsale that locks tokens from withdrawal until it ends.
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*/
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contract PostDeliveryCrowdsale is TimedCrowdsale {
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using SafeMath for uint256;
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mapping(address => uint256) public balances;
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/**
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* @dev Withdraw tokens only after crowdsale ends.
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*/
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function withdrawTokens() public {
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require(hasClosed());
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uint256 amount = balances[msg.sender];
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require(amount > 0);
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balances[msg.sender] = 0;
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_deliverTokens(msg.sender, amount);
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}
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/**
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* @dev Overrides parent by storing balances instead of issuing tokens right away.
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* @param _beneficiary Token purchaser
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* @param _tokenAmount Amount of tokens purchased
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*/
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function _processPurchase(
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address _beneficiary,
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uint256 _tokenAmount
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)
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internal
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{
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balances[_beneficiary] = balances[_beneficiary].add(_tokenAmount);
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}
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}
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