SafeERC20.sol

This file defines the library SafeERC20 that provides wrappers around ERC20 operations which throw on failure. It is used to ensure that all interactions with ERC20 tokens are safe and revert in case of failure. The library also supports tokens that do not return a value but instead revert or throw on failure. To use this library, a contract can include a using SafeERC20 for IERC20; statement, which allows the contract to call the safe operations such as token.safeTransfer(...), etc.

SafeERC20

A library providing safe wrappers around ERC20 token operations.

safeTransfer

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

Safely transfers a specified amount of ERC20 tokens to a specified address.

Parameters

token IERC20: The token to be transferred.
to address: The address to which the tokens will be transferred.
value uint256: The amount of tokens to be transferred.

safeTransferFrom

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

Safely transfers a specified amount of ERC20 tokens from a specified address to another address.

Parameters

token IERC20: The token to be transferred.
from address: The address from which the tokens will be transferred.
to address: The address to which the tokens will be transferred.
value uint256: The amount of tokens to be transferred.

safeApprove

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

Safely approves a specified spender to spend a specified amount of ERC20 tokens from the contract's balance. This function is deprecated due to issues similar to ones in {IERC20-approve}, and its usage is discouraged.

Parameters

token IERC20: The token to be approved.
spender address: The address which will be approved to spend the tokens.
value uint256: The amount of tokens to be approved.

safeIncreaseAllowance

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

Safely increases the allowance of a specified spender to spend a specified additional amount of ERC20 tokens from the contract's balance.

Parameters

token IERC20: The token for which the allowance will be increased.
spender address: The address which will be allowed to spend the additional tokens.
value uint256: The additional amount of tokens to be allowed.

safeDecreaseAllowance

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

Safely decreases the allowance of a specified spender to spend a specified amount of ERC20 tokens from the contract's balance.

Parameters

token IERC20: The token for which the allowance will be decreased.
spender address: The address which will be allowed to spend fewer tokens.
value uint256: The amount of tokens by which to decrease the allowance.