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more comment clarifications

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[SVN r18032]
This commit is contained in:
Dave Abrahams
2003-03-20 15:29:32 +00:00
parent cac5f11a3f
commit eb0676edac
1 changed files with 5 additions and 5 deletions
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10
include/boost/detail/workaround.hpp
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@ -46,16 +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 => 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
// 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