Re: pre, post increment standard behaviour, and friend function declaration

From: Rolf Magnus (ramagnus_at_t-online.de)
Date: 01/26/04 

Date: Mon, 26 Jan 2004 15:12:10 +0100

eddiew_AUS wrote:

> while playing around to check <blah> for my personal project,

What is "<blah>"?

> I discovered an anomaly with my code, compiled using (cringe) visual
> studio ver 6:
>
>
> #include<iostream>
>
> using namespace std;
>
> int main( void )
> {
> int k = 3;
> cout << k;
> cout << " " << k++ << " " << k << " " << ++k << " ";
> cout << k << "\n";
> }
>
> produces the expected output of:
> 3 4 4 4 5

I don't see why you would expect that.

>
> while
>
> #include<iostream>
>
> using namespace std;
>
> int main( void )
> {
> int k = 3;
> cout << k;
> cout << " " << k++ << " " << k << " " << ++k << " " << k << "\n";
> }
>
> produced the output of
> 3 4 4 4 3
>
> Q: Is this another example of non-standard microsoft compilers, or a
> result of the chained function calls?

It's the result of changing k's value multiple times without a sequence
point in between. The behaviour of that code is undefined.

> And another question:
> Q: Is it possible to declare the constructor of class B as a friend
> function to class A, and if so what is the syntax?

I don't think so. Constructors don't have a name.

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