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From: Hartmut Kaiser (hartmut.kaiser_at_[hidden])
Date: 2006-05-14 12:45:54

Hi Felipe,

> In fact, it was easy to implement for this particular case.
> The 'evaluated_conditional_expression()' preprocessing hook
> now has a bool return value, which forces Wave to re-evaluate
> the expression as long as it is 'true'. The new prototype will be:
> template <typename ContextT, typename ContainerT>
> bool
> evaluated_conditional_expression(ContextT const &ctx,
> ContainerT const& expression, bool expression_value)
> { return false; } // ok to continue, do not
> re-evaluate expression
> Wave guarantees to keep the own state unchanged during this,
> which means you can save the context state, change a macro
> definition and return true to force the expression to be
> re-evaluated. This scheme should ensure a consistent behaviour.
> I'll check these changes into the CVS as soon as it will be
> up again. It won't be part of the Boost 1.34.0 release, though.

The changes are checked into the Boost CVS::HEAD now. Please let me know if
this fits your needs now.

Regards Hartmut

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