On Wed, 10 Nov 2010 00:30:55 -0800
Jonathan M Davis <[email protected]> wrote:
> On Tuesday 09 November 2010 23:55:26 spir wrote:
> > Hello,
> >
> > Is there a way for a func to hold 2 optional params of the same type?
> > void f(int p, bool b1=false, bool b2=false) {
> > writefln("p=%s b1=%s b2=%s", p,b1,b2);
> > }
> > Or is there a workaroud?
>
> Try compiling it. It works just fine.
>
> You should be able to have multiple optional parameters, and their types
> shouldn't matter. Where you get into trouble is if that function has
> overloads
> which conflict. Since, in effect, by declaring
>
> void f(int p, bool b1 = false, bool b2 = false)
>
> you've declared
>
> void f(int p, bool b1, bool b2)
> void f(int p, bool b1)
> void f(int p)
Precisely, what a clear exposure of the issue! Sorry, my question was far to
imprecise. I cannot have
void f(int p, bool b2) {}
If I call it with a single bool param, then D logically maps it to b1. In a
language with named params, one would simply write
f(whatever, b2=true);
Is there any workaround?
I thought at replacing b2 by a variable external to the func itself. Eg instead
void test (args, failure=false, silent=false) {}
have
SILENT_TEST = false;
void test (args, failure=false) {... also use SILENT_TEST ...}
But I find the solution a bit weird, it breaks lexical scoping, and forces the
user to overwrite a variable in the func's original scope (module).
(Is this at all possible:
import foo;
foo.K = true;
I'll try...)
> So, trying to declare any of those three separately won't work because your
> first
> definition covers them all.
Right, thank you, Jonathan.
> - Jonathan M Davis
Denis
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