Update class objects within threads

Question

Here's the gist of what I'm trying to do:

// Wrapper for thread call (?)
void doUpdateWrap(MyClass& obj, <args>) {
   obj.doUpdate(<args>)
}

// Make vector of class objects
std::vector<MyClass> vec;
for (int i=0; i<numObj; i++) {
  tmp = MyClass();
  vec.push_back(tmp);
}

// Update all the objects in parallel with threads
std::vector<std::thread> myThreads;
for (int i=0; i<numObj; i++) {
  myThreads.push_back(std::thread(&doUpdateWrap, vec[i], <someArgs>)
}
<join myThreads>

But the compiler is unhappy. What's the right way?