Exporting template function instances to C

[H. S. Teoh via Digitalmars-d-learn]

On Thu, Mar 23, 2017 at 05:29:22PM +0000, data pulverizer via Digitalmars-d-learn wrote:
> On Thursday, 23 March 2017 at 16:38:02 UTC, Adam D. Ruppe wrote:
> > On Thursday, 23 March 2017 at 16:28:18 UTC, data pulverizer wrote:
> > > alias mult!double dmult;
> > > alias mult!float fmult;
> > 
> > Those are just aliases in the D compiler, they don't actually exist
> > in the object file for C to use like regular functions.
> > 
> > Templates need to actually be *used* to be instantiated for export,
> > and aliases make them easier to use, but don't actually use them
> > yet.
[...]
> 
> Thanks. Is there a less ham-handed way of exporting them other than
> wrapping them in functions as I have?

Wrapping them in functions is probably the simplest way to call them
from C.  You *could*, I suppose, use their mangled names directly, then
you wouldn't need a wrapper, but that would be rather difficult to use
on the C end.  On the D side, there's .mangleof that will tell you what
mangled names to use, but if you're calling from C you don't have that
luxury.


T

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