C++ convert hex string to signed integer

Question

I want to convert a hex string to a 32 bit signed integer in C++.

So, for example, I have the hex string \"fffefffe\". The binary representation of this is 111111

Answer 1

just use stoi/stol/stoll for example:

std::cout << std::stol("fffefffe", nullptr, 16) << std::endl;

output: 4294901758