On 06/04/2012 08:36 PM, Xinok wrote:
The increment and decrement operators are highly dependent on operator
precedence and associativity. If the actions are performed in a
different order than the developer presumed, it could cause unexpected
behavior.
I had a simple idea to change the behavior of this operator. It works
for the postfix operators but not prefix. Take the following code:
size_t i = 5;
writeln(i--, i--, i--);
As of now, this writes "543". With my idea, instead it would write,
"555". Under the hood, the compiler would rewrite the code as:
size_t i = 5;
writeln(i, i, i);
--i;
--i;
--i;
It decrements the variable after the current statement. While not the
norm, this behavior is at least predictable. For non-static variables,
such as array elements, the compiler could store a temporary reference
to the variable so it can decrement it afterwards.
I'm not actually proposing we actually make this change. I simply
thought it was a nifty idea worth sharing.
The behaviour the language requires is that the function call executes
as if the parameters were evaluated from left to right. This is exactly
the behaviour you observe. What is the problem you want to fix?
