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From: Eric Niebler (eric_at_[hidden])
Date: 2007-07-23 00:27:48

dan marsden wrote:
> Eric Niebler wrote:
>> Of course, calling deep_copy() in the generator is sub-optimal. Every
>> part of the tree has been deep_copied already except the top-most node.
>> When I find time, I'll write a by_value_generator which makes sure
>> everything in the tree is held by value.
> Cool, I'll keep an eye out for by_value_generator.

OK, by_value_generator is implemented now. Usage is:

   template<class Expr> struct my_expr;
   struct my_domain
     : domain<by_value_generator<generator<my_expr> > >

That's two sequenced generators. The first makes sure the child nodes
are held by value, then forwards the result to the second, which wraps
the new node in my_expr<>. The second generator is optional.

Eric Niebler
Boost Consulting
The Astoria Seminar ==>

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