1ecda54449
* Update StandardToken.sol * Slight improvement in gas efficiency Users tend to attempt to over-spend more than they attempt to burn non-burnable tokens. If the contract checks for overspending before assuring tokens are not being burnt a slight amount of gas might be saved in the long term.
51 lines
1.2 KiB
Solidity
51 lines
1.2 KiB
Solidity
pragma solidity ^0.4.24;
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import "./ERC20Basic.sol";
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import "../../math/SafeMath.sol";
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/**
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* @title Basic token
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* @dev Basic version of StandardToken, with no allowances.
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*/
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contract BasicToken is ERC20Basic {
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using SafeMath for uint256;
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mapping(address => uint256) balances;
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uint256 totalSupply_;
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/**
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* @dev Total number of tokens in existence
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*/
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function totalSupply() public view returns (uint256) {
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return totalSupply_;
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}
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/**
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* @dev Transfer token for a specified address
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* @param _to The address to transfer to.
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* @param _value The amount to be transferred.
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*/
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function transfer(address _to, uint256 _value) public returns (bool) {
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require(_value <= balances[msg.sender]);
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require(_to != address(0));
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balances[msg.sender] = balances[msg.sender].sub(_value);
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balances[_to] = balances[_to].add(_value);
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emit Transfer(msg.sender, _to, _value);
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return true;
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}
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/**
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* @dev Gets the balance of the specified address.
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* @param _owner The address to query the the balance of.
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* @return An uint256 representing the amount owned by the passed address.
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*/
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function balanceOf(address _owner) public view returns (uint256) {
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return balances[_owner];
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}
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}
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