Converting (void*) to std::vector

Question

I have a (void*) buffer that I need to convert to std::vector before I can pass it on. Unfortunately, my C++ casting skills a

Answer 1

The only time this would be legitimate is if you had already created a vector, and simply wanted to get it back.

void SomeFunc(void* input);

main() {
  std::vector< unsigned char > v;
  SomeFunc((void*) &v);
}

SomeFunc(void* input) {
  // Now, you could cast that void* into a vector
  std::vector< unsigned char >* v_ = (vector*)input
}

I haven't actually tried to see if this will run, but that's the spirit of it. That said, if you are making this from scratch, you are definitely doing it wrong. This is really bad. The only time this could be even remotely understandable is if you are forced to implement the already defined "SomeFunc()".