Retrieving C++ string from pointer

I have a method that has a const void* input parameter. How can I cout the string passed in?

For example:

#include <iostream>

void print_string_from_pointer(const void *buf) {
  std::cout << SOMETHING_GOES_HERE << std::endl;
}

int main () {
  std::string x("XYZ");
  print_string_from_pointer(&x);
  return 0;
}

should print "XYZ"