[Issue 14421] Variadic args array force on heap

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14421

--- Comment #5 from yebblies <yebblies at gmail.com> ---
(In reply to John Colvin from comment #4)
> (In reply to yebblies from comment #3)
> > Is there a reason you can't overload and forward the variadic version to the
> > non-variadic after calling dup?
> 
> I don't understand how that would help.
> 
> What I'm concerned about is if making the variadic array argument creates a
> GC allocation, then the .dup makes another one.

If you have this:

char[] foo(char[] args...)
{
    return foo(args.dup);
}
char[] foo(char[] args)
{
    return args;
}

void main()
{
    foo('a', 'b', 'c'); // this will call first overload, and dup
    foo(['a', 'b', 'c']); // this will call second, no dup
}

The array will only be copied if the variadic version is called.

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