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merged from trunk

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[SVN r18033]
This commit is contained in:
Dave Abrahams
2003-03-20 15:38:58 +00:00
parent d11fe4464a
commit fcc6f41a56
1 changed files with 16 additions and 11 deletions
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27
include/boost/detail/workaround.hpp
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@@ -20,16 +20,21 @@
//
// (BOOST_MSVC) != 0 && (BOOST_MSVC) <= 1200
//
// When used for workarounds on the latest known version of a
// compiler, the following convention should be observed:
// When used for workarounds that apply to the latest known version
// and all earlier versions of a compiler, the following convention
// should be observed:
//
// #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 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_TESTED_AT
// which the workaround was known to have been required. When
// BOOST_DETECT_OUTDATED_WORKAROUNDS is not the defined, the macro
// BOOST_TESTED_AT(x) expands to "!= 0", which effectively activates
// the workaround for any version of the compiler. When
// BOOST_DETECT_OUTDATED_WORKAROUNDS is defined, a compiler warning or
// error will be issued if the compiler version exceeds the argument
// to BOOST_TESTED_AT(). This can be used to locate workarounds which
// may be obsoleted by newer versions.
# ifndef BOOST_STRICT_CONFIG
@@ -41,16 +46,16 @@
// 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
// (symbol test) + 1 => if (symbol test) then 2 else 1
// 1 % ((symbol test) + 1) => if (symbol test) then 1 else 0
//
// 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
// symbol test => if (symbol <= x) then 1 else -1
// (symbol test) + 1 => if (symbol <= x) then 2 else 0
// 1 % ((symbol test) + 1) => if (symbol <= x) then 1 else divide-by-zero
//
# ifdef BOOST_DETECT_OUTDATED_WORKAROUNDS