Re: [Boost-users] [xpressive] Calling a placeholder method from within an action?

On Thu, Oct 8, 2009 at 4:43 PM, Eric Niebler <eric@boostpro.com> wrote:

I'm not exactly sure what _placeholder is here, or what you mean by "using an object as a placeholder".

Thanks. I just meant that I was using the placeholder template to pass in an external object. But you seem to have gotten the gist of what I was trying to say anyway :-).

I'm afraid not. But if you go the route of creating function object wrappers, then you can get a nice syntax at the call site:

Yeah, I think I've settled on something like that. And I'm going to resort to a C-style pre-processor define to cut down on the boilerplate code. Something like (untested): #define makeFunc( METHOD, PARAM ) \ struct METHOD##func \ { \ typedef void result_type; \ void operator()(Link *l, PARAM p) const \ { \ l->METHOD(p); \ } \ } \ function<METHOD##func>::type METHOD const = {{}} makeFunc(setPort, int) [repeat the makeFunc for each method] Cheers, Ami.