• Andrew Edwards (9/9) Jan 30 2016 If I understand correctly, this piece of code:
• Adam D. Ruppe (9/10) Jan 30 2016 I'm guessing the macro was there in C to silence compiler
• Andrew Edwards (2/13) Jan 30 2016 Okay, got it. Much appreciated.
• Alex Parrill (4/13) Jan 31 2016 Might want to change the function argument to `ref T v`, as
• Kagamin (2/5) Feb 01 2016 Now notUsed has an unused parameter v.

Andrew Edwards <edwards.ac gmail.com> writes:

If I understand correctly, this piece of code:
     enum NOTUSED(v) do { (void)(1 ? (void)0 : ( (void)(v) ) ); } 
while(0)

can be converted to the following in D:

     void notUsed(T)(T v) { return cast(void)0; };

since it always returns cast(void)0 regardless of the input.

But it cannot be that simple, so what am I missing?

Thanks,
Andrew Edwards

Adam D. Ruppe <destructionator gmail.com> writes:

On Sunday, 31 January 2016 at 02:58:28 UTC, Andrew Edwards wrote:
 But it cannot be that simple, so what am I missing?

I'm guessing the macro was there in C to silence compiler 
warnings about not using a return value. So I think your 
translation is ok:

NOTUSED(somefunction(....));

still calls the function, so the behavior is the same. If I'm 
right, the macro was just about discarding the return value in 
such a way as to tell the compiler warning / lint program that 
you intentionally wanted to ignore it.

Andrew Edwards <edwards.ac gmail.com> writes:

On Sunday, 31 January 2016 at 03:13:46 UTC, Adam D. Ruppe wrote:
 On Sunday, 31 January 2016 at 02:58:28 UTC, Andrew Edwards 
 wrote:
 But it cannot be that simple, so what am I missing?

 I'm guessing the macro was there in C to silence compiler 
 warnings about not using a return value. So I think your 
 translation is ok:

 NOTUSED(somefunction(....));

 still calls the function, so the behavior is the same. If I'm 
 right, the macro was just about discarding the return value in 
 such a way as to tell the compiler warning / lint program that 
 you intentionally wanted to ignore it.

Okay, got it. Much appreciated.

Alex Parrill <initrd.gz gmail.com> writes:

On Sunday, 31 January 2016 at 02:58:28 UTC, Andrew Edwards wrote:
 If I understand correctly, this piece of code:
     enum NOTUSED(v) do { (void)(1 ? (void)0 : ( (void)(v) ) ); 
 } while(0)

 can be converted to the following in D:

     void notUsed(T)(T v) { return cast(void)0; };

 since it always returns cast(void)0 regardless of the input.

 But it cannot be that simple, so what am I missing?

 Thanks,
 Andrew Edwards

Might want to change the function argument to `ref T v`, as 
struct postblits might run otherwise. Probably no reason to 
`return` either.

Kagamin <spam here.lot> writes:

On Sunday, 31 January 2016 at 02:58:28 UTC, Andrew Edwards wrote:
     void notUsed(T)(T v) { return cast(void)0; };

 since it always returns cast(void)0 regardless of the input.

 But it cannot be that simple, so what am I missing?

Now notUsed has an unused parameter v.