25 lines
764 B
Solidity
25 lines
764 B
Solidity
pragma solidity ^0.4.11;
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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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assert(token.transfer(to, value));
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}
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function safeTransferFrom(ERC20 token, address from, address to, uint256 value) internal {
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assert(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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assert(token.approve(spender, value));
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}
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}
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