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