Can I Swap Two Entities Of Arbitrary Type Without Using Templates

In C++11 you can use the auto keyword to declare the temporary variable, for example:

auto temp = a;
a = b;
b = temp;

That works for all types and classes that support the assignment operator.

For numeric types that support the exclusive-or operator you can use the following trick:

a = a ^ b;
b = a ^ b;
a = a ^ b;

For an explanation see: http://en.wikipedia.org/wiki/XOR_swap_algorithm[^]