function parameters using uint32_t

I am wanting to 'activate' an if else using a function's parameters. What I currently have is:

int cpu(Level level, uint32_t function, std::vector<float> &output){
// stuff 
if (function == 1) {
// do something;
}
else {
// do something else;
}
}


TEST(...){
cpu(level, 1, cpu_output);
}

Why is this not working?