Compiler error ?

Quote:

It should be discovered as parse error during compilation.

No it shouldn't. C++ has a comma expression which allows you to do this. The value of the expression is, I think, the last in the list (otherwise the first).

10 == 1,2,3,4,5,6,7,8,9,10

This is a valid expression and is also true. In your example the cast is superfluous btw.

Its use is when some of the expressions's evaluations have side effects such as:

unsigned int s = 0;while( cin >> i, i > 0 )  s += i;

Illco

You are right :) I've forgot about this. Thanks for help.