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• library SafeMath
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function add(uint256 a, uint256 b)
•  contract GivingLog *
•    - function logGive(address _to, string ...

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/**
 *Submitted for verification at Etherscan.io on 2018-05-27
*/

pragma solidity 0.4.23;

// File: node_modules\openzeppelin-solidity\contracts\math\SafeMath.sol

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
    if (a == 0) {
      return 0;
    }
    c = a * b;
    assert(c / a == b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    // uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return a / b;
  }

  /**
  * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
    c = a + b;
    assert(c >= a);
    return c;
  }
}

// File: contracts\Givinglog_back.sol

contract GivingLog {
    using SafeMath for uint128;

    event Give(address give, address take, uint128 amount, string ipfs);

    function logGive(address _to, string _ipfs) public payable{
        require(msg.value > 0);
        _to.transfer(uint128(msg.value));
        emit Give(msg.sender, _to, uint128(msg.value), _ipfs);
    }

}

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[{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_ipfs","type":"string"}],"name":"logGive","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"anonymous":false,"inputs":[{"indexed":false,"name":"give","type":"address"},{"indexed":false,"name":"take","type":"address"},{"indexed":false,"name":"amount","type":"uint128"},{"indexed":false,"name":"ipfs","type":"string"}],"name":"Give","type":"event"}]

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