Subject: [boost] [preprocessor] half-open or closed ranges?
From: Eric Niebler (eric_at_[hidden])
Date: 2008-11-26 13:07:34
I've noticed an inconsistency with how the preprocessor library handles
integer ranges. Consider this:
#define M0(Z,N,DATA) N
BOOST_PP_REPEAT_FROM_TO(1,3,M0,~)
This treats the range 1,3 as half-open. It generates the sequence "1 2".
But consider this:
#define BOOST_PP_LOCAL_MACRO(N) N
#define BOOST_PP_LOCAL_LIMITS (1,3)
#include BOOST_PP_LOCAL_ITERATE()
This treats the range 1,3 as closed. It generates the sequence "1 2 3".
Why the difference?
-- Eric Niebler BoostPro Computing http://www.boostpro.com