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Final version, I think.

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Includes BOOST_TESTED_AT error/warning mechanism for latest version tests.


[SVN r16660]
This commit is contained in:
Dave Abrahams
2002-12-19 04:29:03 +00:00
parent 941d72d8df
commit 75d1036e2b
1 changed files with 34 additions and 4 deletions
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38
include/boost/detail/workaround.hpp
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@ -23,17 +23,47 @@
// When used for workarounds on the latest known version of a
// compiler, the following convention should be observed:
//
// #if BOOST_WORKAROUND(BOOST_MSVC, |0x1301)
// #if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1301))
//
// The version number in this case corresponds to the last version in
// which the workaround was known to have been required. It only has
// value as a comment, since the outcome of the test is always 1
// unless BOOST_STRICT_CONFIG is defined.
// value as a comment unless BOOST_DETECT_OUTDATED_WORKAROUNDS is
// defined, in which case a compiler warning or error will be issued
// when the compiler version exceeds the argument to BOOST_CHECKED_AT
# ifndef BOOST_STRICT_CONFIG
# define BOOST_WORKAROUND(symbol, test) ((symbol) != 0 && ((symbol) test))
# define BOOST_WORKAROUND(symbol, test) \
(symbol != 0) && (1 % (( (symbol test) ) + 1))
// ^ ^ ^ ^
// The extra level of parenthesis nesting above, along with the
// BOOST_OPEN_PAREN indirection below, is required to satisfy the
// broken preprocessor in MWCW 8.3 and earlier.
//
// The basic mechanism works as follows:
// (symbol test) + 1 => 2 if the test passes, 1 otherwise
// 1 % ((symbol test) + 1) => 1 if the test passes, 0 otherwise
//
// The complication with % is for cooperation with BOOST_TESTED_AT().
// When "test" is BOOST_TESTED_AT(x) and
// BOOST_DETECT_OUTDATED_WORKAROUNDS is #defined,
//
// symbol test => 1 if symbol <= x, -1 otherwise
// (symbol test) + 1 => 2 if symbol <= x, 0 otherwise
// 1 % ((symbol test) + 1) => 1 if symbol <= x, zero divide otherwise
//
# ifdef BOOST_DETECT_OUTDATED_WORKAROUNDS
# define BOOST_OPEN_PAREN (
# define BOOST_TESTED_AT(value) > value) ?(-1): BOOST_OPEN_PAREN 1
# else
# define BOOST_TESTED_AT(value) != 0
# endif
# else
# define BOOST_WORKAROUND(symbol, test) 0
# endif
#endif // WORKAROUND_DWA2002126_HPP