Re: [Boost-users] [Parameter] Adding arguments to pack through macro?

From: Rene Rivera (grafikrobot_at_[hidden])
Date: 2006-10-06 15:59:56

Johan Nilsson wrote:
> Hi,
> 
> I guess that the subject line isn't even technically correct. What I'd like 
> to do is to implement something like the following:
> 
> #define FOO(x) MyNamedParamFn(x, d = 3, e = 4)
> 
> Where e.g.
> 
> "FOO((a = 0, b = 1));"
> 
> would expand to the equivalent of:
> 
> MyNamedParamFn(a = 0, b= 1, d = 3, e = 4);
> 
> Is this possible?

What others failed to mention is that you can do this *without* macros. 
For example:

template <typename ArgPack>
void MyNamedParamFn(ArgPack args)
{
   //...
}

template <typename ArgPack>
void Foo(ArgPack args)
{
   MyNamedParamFn((args, d = 3, e = 4));
}

Foo((a = 0, b = 1));

HTH.

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