b7d60f2f9a
* Bump required compiler version to 0.5.2. * Fix shadowed variable warning in ERC20Migrator. * Rename Counter to Counters. * Add dummy state variable to SafeERC20Helper. * Update changelog entry. * Fix CountersImpl name. * Improve changelog entry.
44 lines
1.2 KiB
Solidity
44 lines
1.2 KiB
Solidity
pragma solidity ^0.5.2;
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import "../validation/TimedCrowdsale.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) private _balances;
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/**
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* @dev Withdraw tokens only after crowdsale ends.
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* @param beneficiary Whose tokens will be withdrawn.
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*/
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function withdrawTokens(address beneficiary) public {
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require(hasClosed());
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uint256 amount = _balances[beneficiary];
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require(amount > 0);
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_balances[beneficiary] = 0;
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_deliverTokens(beneficiary, amount);
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}
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/**
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* @return the balance of an account.
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*/
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function balanceOf(address account) public view returns (uint256) {
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return _balances[account];
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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(address beneficiary, uint256 tokenAmount) internal {
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_balances[beneficiary] = _balances[beneficiary].add(tokenAmount);
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}
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}
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