You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
32 lines
794 B
32 lines
794 B
pragma solidity ^0.4.24;
|
|
|
|
import "./ERC20Basic.sol";
|
|
import "./ERC20.sol";
|
|
|
|
|
|
/**
|
|
* @title SafeERC20
|
|
* @dev Wrappers around ERC20 operations that throw on failure.
|
|
* To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
|
|
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
|
|
*/
|
|
library SafeERC20 {
|
|
function safeTransfer(ERC20Basic token, address to, uint256 value) internal {
|
|
require(token.transfer(to, value));
|
|
}
|
|
|
|
function safeTransferFrom(
|
|
ERC20 token,
|
|
address from,
|
|
address to,
|
|
uint256 value
|
|
)
|
|
internal
|
|
{
|
|
require(token.transferFrom(from, to, value));
|
|
}
|
|
|
|
function safeApprove(ERC20 token, address spender, uint256 value) internal {
|
|
require(token.approve(spender, value));
|
|
}
|
|
}
|
|
|