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From: Paul Mensonides (pmenso57_at_[hidden])
Date: 2004-12-01 19:00:07

> -----Original Message-----
> From: boost-bounces_at_[hidden]
> [mailto:boost-bounces_at_[hidden]] On Behalf Of Ryan Saunders

Hi Ryan.

> typedef typename meta_func< typename T0::inner_type,
> typename T1::inner_type, typename T2::inner_type>::type;
> I don't see a way to do this with any of the ENUM_XXX macros.
> Maybe something like ENUM_SPLIT_PARAMS(COUNT, PREF, SUFF)
> that would generate PREF ## n ## SUFF?

The ENUM_BINARY_PARAMS is the general form for this kind of stuff. You
typically use it with INTERCEPT, such as:

#include <boost/preprocessor/facilities/intercept.hpp>
#include <boost/preprocessor/repetition/enum_binary_params.hpp>

    3, typename T, ::inner_type BOOST_PP_INTERCEPT

INTERCEPT (unsurpisingly) intercepts the numeric concatenation and expands to

Normally the library avoids macros that have very specific uses. In fact,
ENUM_PARAMS and ENUM_BINARY_PARAMS are probably the two most domain-specific
macros in the library. If the usage scenario is too complex for ENUM_PARAMS or
ENUM_BINARY_PARAMS (possibly with INTERCEPT), then you need to use the much more
general form, ENUM.

Paul Mensonides

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