TITLE: When implicit type conversions gives unpleasant results


(This comes from "Programming in C++" by Henricson and Nyquist, example 51.)


Example 51  When implicit type conversions gives unpleasant results


// This function looks bulletproof, but it isn't.
// Newer versions of compilers should flag this as an error.

void mySwap (int& x, int& y)
{
	int temp = x;
	x = y;
	y = temp;
}


int i = 10;
unsigned int ui = 20;

mySwap (i, ui);		// What really happens here is:
			// int T = int (ui);   implicit conversion
			// mySwap (i, T);      ui is of course not changed
			// fortunately, the compiler warns for this !