96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/*
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Copyright Rene Rivera 2017
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_PREDEF_WORKAROUND_H
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#define BOOST_PREDEF_WORKAROUND_H
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/* tag::reference[]
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= `BOOST_PREDEF_WORKAROUND`
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[source]
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----
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BOOST_PREDEF_WORKAROUND(symbol,comp,major,minor,patch)
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----
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Usage:
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[source]
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----
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#if BOOST_PREDEF_WORKAROUND(BOOST_COMP_CLANG,<,3,0,0)
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// Workaround for old clang compilers..
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#endif
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----
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Defines a comparison against two version numbers that depends on the definion
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of `BOOST_STRICT_CONFIG`. When `BOOST_STRICT_CONFIG` is defined this will expand
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to a value convertible to `false`. Which has the effect of disabling all code
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conditionally guarded by `BOOST_PREDEF_WORKAROUND`. When `BOOST_STRICT_CONFIG`
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is undefine this expand to test the given `symbol` version value with the
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`comp` comparison against `BOOST_VERSION_NUMBER(major,minor,patch)`.
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*/ // end::reference[]
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#ifdef BOOST_STRICT_CONFIG
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# define BOOST_PREDEF_WORKAROUND(symbol, comp, major, minor, patch) (0)
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#else
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# include <boost/predef/version_number.h>
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# define BOOST_PREDEF_WORKAROUND(symbol, comp, major, minor, patch) \
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( (symbol) != (0) ) && \
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( (symbol) comp (BOOST_VERSION_NUMBER( (major) , (minor) , (patch) )) )
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#endif
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/* tag::reference[]
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= `BOOST_PREDEF_TESTED_AT`
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[source]
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----
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BOOST_PREDEF_TESTED_AT(symbol,major,minor,patch)
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----
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Usage:
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[source]
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----
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#if BOOST_PREDEF_TESTED_AT(BOOST_COMP_CLANG,3,5,0)
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// Needed for clang, and last checked for 3.5.0.
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#endif
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----
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Defines a comparison against two version numbers that depends on the definion
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of `BOOST_STRICT_CONFIG` and `BOOST_DETECT_OUTDATED_WORKAROUNDS`.
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When `BOOST_STRICT_CONFIG` is defined this will expand to a value convertible
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to `false`. Which has the effect of disabling all code
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conditionally guarded by `BOOST_PREDEF_TESTED_AT`. When `BOOST_STRICT_CONFIG`
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is undefined this expand to either:
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* A value convertible to `true` when `BOOST_DETECT_OUTDATED_WORKAROUNDS` is not
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defined.
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* A value convertible `true` when the expansion of
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`BOOST_PREDEF_WORKAROUND(symbol, <=, major, minor, patch)` is `true` and
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`BOOST_DETECT_OUTDATED_WORKAROUNDS` is defined.
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* A compile error when the expansion of
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`BOOST_PREDEF_WORKAROUND(symbol, >, major, minor, patch)` is true and
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`BOOST_DETECT_OUTDATED_WORKAROUNDS` is defined.
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*/ // end::reference[]
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#ifdef BOOST_STRICT_CONFIG
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# define BOOST_PREDEF_TESTED_AT(symbol, major, minor, patch) (0)
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#else
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# ifdef BOOST_DETECT_OUTDATED_WORKAROUNDS
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# define BOOST_PREDEF_TESTED_AT(symbol, major, minor, patch) ( \
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BOOST_PREDEF_WORKAROUND(symbol, <=, major, minor, patch) \
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? 1 \
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: (1%0) )
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# else
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# define BOOST_PREDEF_TESTED_AT(symbol, major, minor, patch) \
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( (symbol) >= BOOST_VERSION_NUMBER_AVAILABLE )
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# endif
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#endif
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#endif
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