Is there some way to poke enough of a hole in "pure" to get some writeln debugging statements in?

On Saturday, 8 February 2014 at 22:27:39 UTC, Nick Sabalausky wrote:
> Is there some way to poke enough of a hole in "pure" to get some writeln debugging statements in?

literally write
debug writeln(..)

abnd it should work in the pure function

On 2/8/2014 5:30 PM, Adam D. Ruppe wrote:
> On Saturday, 8 February 2014 at 22:27:39 UTC, Nick Sabalausky wrote:
>> Is there some way to poke enough of a hole in "pure" to get some
>> writeln debugging statements in?
>
> literally write
> debug writeln(..)
>
> abnd it should work in the pure function

Nice!

So I take it purity enforcement is disabled with the -debug flag? Or is it some sort of hack with writeln?

On Sunday, 9 February 2014 at 00:18:28 UTC, Nick Sabalausky wrote:
> So I take it purity enforcement is disabled with the -debug flag? Or is it some sort of hack with writeln?

The debug statement specifically (which is only compiled in when you use the -debug flag).

debug foo(); will work in a pure function, even if foo is not pure.

On Sunday, 9 February 2014 at 00:18:28 UTC, Nick Sabalausky wrote:
> On 2/8/2014 5:30 PM, Adam D. Ruppe wrote:
>> On Saturday, 8 February 2014 at 22:27:39 UTC, Nick Sabalausky wrote:
>>> Is there some way to poke enough of a hole in "pure" to get some
>>> writeln debugging statements in?
>>
>> literally write
>> debug writeln(..)
>>
>> abnd it should work in the pure function
>
> Nice!
>
> So I take it purity enforcement is disabled with the -debug flag? Or is it some sort of hack with writeln?

It is a compiler benefit.

Wish it would work with @safe and nothrow too, granted writeln should eventually be @safe/trusted anyway.

"Jesse Phillips"  wrote in message news:vaatltklsmbmdnabojip@forum.dlang.org...

> Wish it would work with @safe and nothrow too, granted writeln should eventually be @safe/trusted anyway.

I just travelled back in time and granted your wish!


int x;
int* p;

void main() pure nothrow @safe
{
   debug x = 3;
   debug throw new Exception(null);
   debug *(p+7) = 2;
} 

On Tuesday, 11 February 2014 at 07:52:57 UTC, Daniel Murphy wrote:
>
> "Jesse Phillips"  wrote in message news:vaatltklsmbmdnabojip@forum.dlang.org...
>
>> Wish it would work with @safe and nothrow too, granted writeln should eventually be @safe/trusted anyway.
>
> I just travelled back in time and granted your wish!
>
>
> int x;
> int* p;
>
> void main() pure nothrow @safe
> {
>    debug x = 3;
>    debug throw new Exception(null);
>    debug *(p+7) = 2;
> }

I guess I wasn't clear, when I compile with -debug I should be able to use writeln in an @safe/nothrow function just as it is with pure.