force inline/not-inline

[Jonathan M Davis via Digitalmars-d]

On Tuesday, 28 July 2015 at 21:24:31 UTC, David Nadlinger wrote:
> On Tuesday, 28 July 2015 at 15:56:52 UTC, Jonathan M Davis 
> wrote:
>> It[Accepting Booleans]'s far more flexible in generic code.
>
> It's the other way round. pragma(inline) has currently *three* 
> behaviors:
>
> pragma(inline);
> pragma(inline, true);
> pragma(inline, false);
>
> There is no way to represent those as a single boolean.

The second two states can be. So, you can turn inlining on and 
off by feeding it a template argument or the result of a function 
or something. But it is true that you'd be stuck with a static if 
in the case that you just wanted to set it to the default 
behavior. I don't know what you'd do to be able to take an 
argument for all three though - maybe a string or just some known 
integral value?

I don't know how much it really matters ultimately though, since 
I expect that for the most part, the folks who are going to be 
using this pragma won't be using it generically.

Personally, I very much doubt that I'll ever use it, since I've 
never worked on code that cared about performance so much that 
you _had_ to force inlining somewhere. The compiler usually does 
a good enough job (though that's with C++ compilers; who knows 
how well dmd does).

- Jonathan M Davis