Swap without temporary variable

Do you know how to swap values without a temporary variable?

C++:
void swap(int& a, int& b)
{
   a=a^b;
   b=a^b;
   a=a^b;
}
Alternative solution:
C++:
void swap(int& a, int& b)
{
   a=a+b;
   b=ab;
   a=ab;
}
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