SafeERC20

Git Source

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