Is short-circuiting logical operators mandated? And evaluation order?

Question

Does the ANSI standard mandate the logical operators to be short-circuited, in either C or C++?

I\'m confused for I recall the K&R book saying your code

Answer 1

Be very very careful.

For fundamental types these are shortcut operators.

But if you define these operators for your own class or enumeration types they are not shortcut. Because of this semantic difference in their usage under these different circumstances it is recommended that you do not define these operators.

For the operator && and operator || for fundamental types the evaluation order is left to right (otherwise short cutting would be hard :-) But for overloaded operators that you define, these are basically syntactic sugar to defining a method and thus the order of evaluation of the parameters is undefined.