Re: deep copying

From:

"Victor Bazarov" <v.Abazarov@comAcast.net>

Newsgroups:

comp.lang.c++

Date:

Wed, 3 Oct 2007 13:23:53 -0400

Message-ID:

<fe0j78$9mf$1@news.datemas.de>

bob@blah.com wrote:

I have been tasked with transferring a rather complex, deeply nested
structure across dll's / memory spaces and effectively I need to deep
copy the structure in question. Its a C struct and it contains
pointers. I would have liked to think I could copy construct it, but I
can't. I need to follow the pointers.

Does anybody know if there's a quick and easy way to achieve this (as
opposed to manually following the pointers and fields which go 8-15
levels deep). I'm trying to see if boost can help me out but so far I
haven't seen anything.

Does anybody know whats the best approach to take here? I'm open to
all options.... i.e. anything but manually follow those 15
levels!! :) :) I'm fairly sure I'm reinventing the wheel, hence the
question. The struct in question is a C struct, used in a c++ app
(visual studio/borland, if its important).

Something in line with

    // for members that are built-in or structs
    template<class T> class deepcopy {
        static void go(T& dest, T const& src) {
            dest = src;
        }
    };

    // for the members that are pointers
    template<class T> class deepcopy<T*> {
        static void go(T* dest, T const* src) {
            return deepcopy<T>::go(*dest, *src);
        }
    };

    // and you only need to implement a real 'deepcopy' for your
    // top-level struct (everything else should just fall into place)
    void deepcopy(mystruct& dest, mystruct const& src) {
        deepcopy(dest.member_one, src.member_one);
        ...
    }

V
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