abi encoding with selector and additional variable

Question

I am trying to abi encode a function abc(address, string)

the encoding looks like this

Address.delegateCall(abi.encodeWithSignature("abc(address,string)", _address, _string))

but I actually want to attach another variable which is not part of the function parameter

Address.delegateCall(abi.encodeWithSignature("abc(address,string)", _address, _string, _myaddress))

I saw this being possible in Meta transactions trusted forwarder (here) contract with abi.encodePacked how to achieve this ?

Answer 1

Seems like abi.encode, with signature , with selector all has same underlying encoding same. but packed is compressed version of it

Address.delegateCall(abi.encodePacked(abi.encodeWithSignature("abc(address,string)", _address, _string), _myaddress)

achieves it