Boost :

Date view	Thread view	Subject view	Author view

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2002-04-11 20:01:20

Next message: Rene Rivera: "Re: [boost] preprocessor lib question"
Previous message: David Abrahams: "[boost] Preprocessor lib request"
In reply to: David Abrahams: "[boost] Preprocessor lib request"

David Abrahams wrote:
> I'd like to have some simple SELECT_<N>_OF_<M> macros for use with
> macros like BOOST_PP_REPEAT:
>
> #define SELECT_1_OF_2(I,P) I
> #define SELECT_2_OF_2(I,P) P
>
> #define Xs(N) BOOST_PP_REPEAT(N,SELECT_2_OF_2,"X") ""
>
> Xs(3) -> "X" "X" "X" ""

MPL calls these BOOST_MPL_PP_PROJECT1ST and BOOST_MPL_PP_PROJECT2ND (taking
the STL terminology). See "mpl/aux_/preprocessor/project1st.hpp".

Aleksey

Next message: Rene Rivera: "Re: [boost] preprocessor lib question"
Previous message: David Abrahams: "[boost] Preprocessor lib request"
In reply to: David Abrahams: "[boost] Preprocessor lib request"

Date view	Thread view	Subject view	Author view

Boost list run by bdawes at acm.org, gregod at cs.rpi.edu, cpdaniel at pacbell.net, john at johnmaddock.co.uk