openzeppelin-contracts/contracts/crowdsale/emission/MintedCrowdsale.sol

pragma solidity ^0.4.24;

import "../Crowdsale.sol";
import "../../token/ERC20/ERC20Mintable.sol";


/**
 * @title MintedCrowdsale
 * @dev Extension of Crowdsale contract whose tokens are minted in each purchase.
 * Token ownership should be transferred to MintedCrowdsale for minting.
 */
contract MintedCrowdsale is Crowdsale {

  /**
   * @dev Overrides delivery by minting tokens upon purchase.
   * @param _beneficiary Token purchaser
   * @param _tokenAmount Number of tokens to be minted
   */
  function _deliverTokens(
    address _beneficiary,
    uint256 _tokenAmount
  )
    internal
  {
    // Potentially dangerous assumption about the type of the token.
    require(ERC20Mintable(address(token)).mint(_beneficiary, _tokenAmount));
  }
}