February 06, 2012
Hi,

I'd like to have a function foo which shall depend on several compile-time expressions (e.g. strings) and gets several arguments whose types are templatized. Here, "several" means in both cases that the number of expressions/arguments are to be determined at compile-time. Here is an example:

foo!("a", "b", c")(42, new MyClass(), 7.0);

At compile-time, some template parameters (strings "a", "b" and "c") shall be given explicitly and some more template parameters (types of arguments int, MyClass, double) shall be deduced from the function arguments.

Is that possible? Of course, I cannot setup two TemplateTupleParameters.

Best regards,

Matthias

February 06, 2012
On 02/06/2012 11:26 PM, Matthias Walter wrote:
> Hi,
>
> I'd like to have a function foo which shall depend on several
> compile-time expressions (e.g. strings) and gets several arguments whose
> types are templatized. Here, "several" means in both cases that the
> number of expressions/arguments are to be determined at compile-time.
> Here is an example:
>
> foo!("a", "b", c")(42, new MyClass(), 7.0);
>
> At compile-time, some template parameters (strings "a", "b" and "c")
> shall be given explicitly and some more template parameters (types of
> arguments int, MyClass, double) shall be deduced from the function
> arguments.
>
> Is that possible? Of course, I cannot setup two TemplateTupleParameters.
>
> Best regards,
>
> Matthias
>

This should do the job:

template foo(CompileTimeArgs...){
    auto foo(RuntimeArgTypes...)(RuntimeArgTypes args){ ... }
}

It requires explicit !() in case the CompileTimeArgs tuple is empty.

(If that is not what you want, introduce another overload of the template. Eventually, just having alias foo!() foo; will work too, but not currently, because of a compiler bug)
February 07, 2012
http://d.puremagic.com/issues/show_bug.cgi?id=2599

"Matthias Walter" <xammy@xammy.homelinux.net> wrote in message news:mailman.71.1328567829.20196.digitalmars-d-learn@puremagic.com...
> Hi,
>
> I'd like to have a function foo which shall depend on several compile-time expressions (e.g. strings) and gets several arguments whose types are templatized. Here, "several" means in both cases that the number of expressions/arguments are to be determined at compile-time. Here is an example:
>
> foo!("a", "b", c")(42, new MyClass(), 7.0);
>
> At compile-time, some template parameters (strings "a", "b" and "c") shall be given explicitly and some more template parameters (types of arguments int, MyClass, double) shall be deduced from the function arguments.
>
> Is that possible? Of course, I cannot setup two TemplateTupleParameters.
>
> Best regards,
>
> Matthias
> 


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