SafeERC20

Git Source

Submitted for verification at Etherscan.io on 2021-06-03 Submitted for verification at Etherscan.io on 2021-04-14

Wrappers around ERC20 operations that throw on failure (when the token contract returns false). Tokens that return no value (and instead revert or throw on failure) are also supported, non-reverting calls are assumed to be successful. To use this library you can add a using SafeERC20 for IERC20; statement to your contract, which allows you to call the safe operations as token.safeTransfer(...), etc.

Functions

safeTransfer

function safeTransfer(IERC20 token, address to, uint256 value) internal;

safeTransferFrom

function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal;

safeApprove

Deprecated. This function has issues similar to the ones found in IERC20-approve, and its usage is discouraged. Whenever possible, use {safeIncreaseAllowance} and {safeDecreaseAllowance} instead.

function safeApprove(IERC20 token, address spender, uint256 value) internal;

safeIncreaseAllowance

function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal;

safeDecreaseAllowance

function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal;

_callOptionalReturn

Imitates a Solidity high-level call (i.e. a regular_old function call to a contract), relaxing the requirement on the return value: the return value is optional (but if data is returned, it must not be false).

function _callOptionalReturn(IERC20 token, bytes memory data) private;

Parameters