The BOOST_PP_SEQ_REST_N macro expands to a seq of all but the first n elements of a seq.

Usage

BOOST_PP_SEQ_REST_N(n, seq)

Arguments

n
The number of elements to remove.
seq
The seq from which the elements are to be removed.

Remarks

This macro extracts n elements from the beginning of seq and returns the remainder of seq as a new seq.

It is undefined behavior if n is greater or equal to the size of the seq.

See Also

Requirements

Header:  <boost/preprocessor/seq/rest_n.hpp>

Sample Code 

#include <boost/preprocessor/arithmetic/inc.hpp>
#include <boost/preprocessor/seq/elem.hpp>
#include <boost/preprocessor/seq/first_n.hpp>
#include <boost/preprocessor/seq/rest_n.hpp>
#include <boost/preprocessor/seq/size.hpp>

#define NUMBERS \
   (0)(1)(2)(3)(4)(5)(6)(7)(8)(9) \
   (10)(11)(12)(13)(14)(15)(16)(17)(18)(19) \
   (20)(21)(22)(23)(24)(25)(26)(27)(28)(29) \
   (30)(31)(32)(33)(34)(35)(36)(37)(38)(39) \
   (40)(41)(42)(43)(44)(45)(46)(47)(48)(49) \
   (50)(51)(52)(53)(54)(55)(56)(57)(58)(59) \
   (60)(61)(62)(63)(64)(65)(66)(67)(68)(69) \
   (70)(71)(72)(73)(74)(75)(76)(77)(78)(79) \
   (80)(81)(82)(83)(84)(85)(86)(87)(88)(89) \
   (90)(91)(92)(93)(94)(95)(96)(97)(98)(99) \
   (100)(101)(102)(103)(104)(105)(106)(107)(108)(109) \
   (110)(111)(112)(113)(114)(115)(116)(117)(118)(119) \
   (120)(121)(122)(123)(124)(125)(126)(127)(128)(129) \
   (130)(131)(132)(133)(134)(135)(136)(137)(138)(139) \
   (140)(141)(142)(143)(144)(145)(146)(147)(148)(149) \
   (150)(151)(152)(153)(154)(155)(156)(157)(158)(159) \
   (160)(161)(162)(163)(164)(165)(166)(167)(168)(169) \
   (170)(171)(172)(173)(174)(175)(176)(177)(178)(179) \
   (180)(181)(182)(183)(184)(185)(186)(187)(188)(189) \
   (190)(191)(192)(193)(194)(195)(196)(197)(198)(199) \
   (200)(201)(202)(203)(204)(205)(206)(207)(208)(209) \
   (210)(211)(212)(213)(214)(215)(216)(217)(218)(219) \
   (220)(221)(222)(223)(224)(225)(226)(227)(228)(229) \
   (230)(231)(232)(233)(234)(235)(236)(237)(238)(239) \
   (240)(241)(242)(243)(244)(245)(246)(247)(248)(249) \
   (250)(251)(252)(253)(254)(255)(256) \
   /**/

#define SUPER_ADD(x, y) BOOST_PP_SEQ_ELEM(y, BOOST_PP_SEQ_REST_N(x, NUMBERS))

SUPER_ADD(100, 100) // expands to 200

#define SUPER_SUB(x, y) \
   BOOST_PP_SEQ_SIZE( \
      BOOST_PP_SEQ_REST_N( \
         BOOST_PP_INC(y), \
         BOOST_PP_SEQ_FIRST_N( \
            BOOST_PP_INC(x), NUMBERS \
         ) \
      ) \
   ) \
   /**/

SUPER_SUB(67, 25) // expands to 42
© Copyright Housemarque Oy 2002
© Copyright Paul Mensonides 2002

Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at www.boost.org/LICENSE_1_0.txt)