Re: [Boost-users] [MPL?] generating functions for all fields in a struct

From: David Abrahams (dave_at_[hidden])
Date: 2007-03-08 15:33:41

on Thu Mar 08 2007, Christoph Duelli <duelli-AT-melosgmbh.de> wrote:
> Given a struct like
>   struct X { int a; char b; float c; }
> and some function-'template' f
>
> is it possible to 'generate' - preferably by means of templates, MPL or
> something of the kind - variations of some function f for each of X's
> fields?
>
> E.g. I'd like to have functions like
> int getA() { return a; }
> char getB() { return b; }
> float getC() { return c; }
> ...
>
> (The functions I have in mind are more complex, obviously, but the idea is
> to generate one such function for all the fields of X.)
> I would like to avoid writing a macro call or something per field, as I
> would like the code to work (after recompiling it) even if the definition
> of X is changed and some fields are added.
> So, is there some generic 'iterator' over the fields of a struct?

Nope.

You might consider using Boost.Fusion and using a tuple instead of a
struct.  You won't be able to generate a family of overloaded
functions at namespace scope, but you will be able to generate a
family of overloaded (static) member functions.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com