◆ Purpose

to transfer tokens from the contract address

◆ Input & Return value

(address token, address from, address tok uint256 value) ⇒ (bool success)

Checking this page. It describes what I mean.safeTransfer

ADDRESS.call(abi.encodeWithSelector(FUNCTIONID, from, to, value))

◆ Example

token (WETH) = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2

from(Vitalic.eth) = 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045

to(MyWallet) = 0xaD890f60399E9feaaf2ff5d5973e7eC8302a8247

value = 100000000

◆ Code and Explain

function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        // 0x23b872dd == (keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(P
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::transferFrom: transferFrom failed'
        );
    }

◆ Link

• Github

https://github.com/Uniswap/solidity-lib/blob/master/contracts/libraries/TransferHelper.sol#L33

• Solidity By Example | Call

https://solidity-by-example.org/call