(C++) Convert a double to a std::string of bits

include <iostream>

include <string>

include <cassert>


std::string doubleToBitString(const double& anyDouble)
{
  static union MyUnion
  {
    unsigned int myInts[2];
    double myDouble;
  } myUnion;
  myUnion.myDouble = anyDouble;
  int myInt0 = myUnion.myInts[0];
  int myInt1 = myUnion.myInts[1];
  std::string myBitString;
  for (int i = 0; i<32; ++i)
  {
    if (myInt0%2==0)
      myBitString = "0" + myBitString;
    else
      myBitString = "1" + myBitString;
    myInt0>>=1;
  }
  for (int i = 0; i<32; ++i)
  {
    if (myInt1%2==0)
      myBitString = "0" + myBitString;
    else
      myBitString = "1" + myBitString;
    myInt1>>=1;
  }
  return myBitString;
}
int main()
{
  const double zero = 0.0;
  const double minusZero = -0.0;
  std::cout << doubleToBitString(zero) << std::endl;
  std::cout << doubleToBitString(minusZero) << std::endl;
}