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From: Vladimir Prus (ghost_at_[hidden])
Date: 2003-06-05 09:50:17

David Abrahams wrote:
> Vladimir Prus <ghost_at_[hidden]> writes:
> > Hmm... the first one should be converted to NM_ASM. The generator should
> > produce targets in fixed order, I believe.
> A generator with signature A -> B B produces two Bs at the same
> time. Am I missing something?

True. However, the first CPP returned is always the one which must be
processed further.

> What element of the system other than your parenthesized note (which
> I don't believe can be captured in code) indicates that the first one
> should be converted instead of the 2nd one?

In the current system you can describe it by creating a generator STATIC_DATA
<- ECPP, which will
1. Create CPP from ECPP by recursive call to 'generators.construct'.
2. Take a first CPP and convert it to NM_ASM by another call to
3. Convert NM_ASM to STATIC_DATA
4. Return STATIC_DATA and the second CPP

If you take a look at Jamfile for part of this example, still at
you'll notice similiar approach.

It's not automatic, but user can be asked to do such things for complex
transformations. And it must be able to do that.

- Volodya


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