33 lines
814 B
Solidity
33 lines
814 B
Solidity
pragma solidity ^0.4.24;
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import "./ERC20Basic.sol";
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import "./ERC20.sol";
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/**
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* @title SafeERC20
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* @dev Wrappers around ERC20 operations that throw on failure.
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* To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
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* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
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*/
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library SafeERC20 {
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function safeTransfer(ERC20Basic _token, address _to, uint256 _value) internal {
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require(_token.transfer(_to, _value));
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}
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function safeTransferFrom(
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ERC20 _token,
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address _from,
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address _to,
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uint256 _value
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)
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internal
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{
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require(_token.transferFrom(_from, _to, _value));
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}
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function safeApprove(ERC20 _token, address _spender, uint256 _value) internal {
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require(_token.approve(_spender, _value));
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}
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}
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