[boost] Re: Proposal: configurable tuple arity limit

From: Pavel Vozenilek (pavel_vozenilek_at_[hidden])
Date: 2004-02-16 05:59:37

"Max Motovilov" <max_at_[hidden]> wrote

> tuples even at a cost of extended compilation time. Using
boost/preprocessor
> library, it is relatively easy to rewrite the tuple code in such a way
that
> arity limit will depend on a single configuration macro without incuring
any
> other changes to the library. No additional cost will be imposed on the
> users who are satisifed with the current tuple library.
>
There may be problems with Boost.Preprocessor:

1. different compiler have different max limits on code
    outputted from expanded macro. E.g. BCB has quite low limit
   (somewhere 1-2kB of text). When this limit is reached, BCB
   starts to behave unpredictably.

2. compilers based on EDG frontend take exponential time
   to process some Boost.PP statements. This is problem
   e.g. of  Intel C++ compiler.

One way to avoid the problems above is to use local or
file iteration technique, available in Boost.PP.

It would be good to test impact of your change on as many
compilers as possible.

/Pavel