Gennaro Prota <[EMAIL PROTECTED]> writes:
> On Tue, 17 Dec 2002 11:44:12 -0000, "John Maddock"
> <[EMAIL PROTECTED]> wrote:
>
>>Personally I would rather that you stuck to the simplest possible
>>implementation, and for me that outweighs the advantages that using the pp
>>lib might bring. The recent discussion is all very clever, but I'm not
>>convinced that it really adds anything.
>
> As to possible alternatives, my idea is to use two different macros:
> the BOOST_WORKAROUND version, which Dave has already implemented, and
> another one that doesn't let you specify a test, just the version. The
> point is: what test could the user specify that can be negated without
> giving unwanted errors when detection of outdated workarounds is
> enabled? Basically, only <= (For instance: if you specify == 0x600,
> you just risk to get an error when testing with version 0x500). That
> considered, I would say: let him just specify the version with
> something like
>
> #define ERROR(cond) (1 / (cond? 0 : 1))
> #define WORKAROUND_WITH_CHECK(symbol, version) ( \
> ((symbol) != 0) \
> && ERROR(DETECT_OUTDATED && (symbol > version) ) \
> )
>
I'd much prefer:
BOOST_WORKAROUND(__SUNPRO_CC, BOOST_LATEST_VERSION(0x530))
Which I think is easily achievable, no?
# define BOOST_WORKAROUND(symbol, test) (symbol != 0) && (1 % ((symbol test) + 1))
# ifdef BOOST_DETECT_OUTDATED
# define BOOST_LATEST_VERSION(value) >value?-1:1
# else
# define BOOST_LATEST_VERSION(value) != 0
# endif
int x = 0;
# if BOOST_WORKAROUND(COMPILER_VERSION, < 20)
int y = 0;
# elif BOOST_WORKAROUND(COMPILER_VERSION, BOOST_LATEST_VERSION(20))
int z = 0;
# endif
This seems to work for everything but metrowerks, which says:
### mwcc Compiler:
# File: foo.cpp
# ----------------
# 16: ( 21 != 0) && (1 % (( 21 >20?-1:1) + 1))
# Error: ^
# expression syntax error
:(
If anyone can come up with a workaround, I'd be psyched!
--
David Abrahams
[EMAIL PROTECTED] * http://www.boost-consulting.com
Boost support, enhancements, training, and commercial distribution
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