1 /* 2 Copyright Rene Rivera 2017 3 Distributed under the Boost Software License, Version 1.0. 4 (See accompanying file LICENSE_1_0.txt or copy at 5 http://www.boost.org/LICENSE_1_0.txt) 6 */ 7 8 #ifndef BOOST_PREDEF_WORKAROUND_H 9 #define BOOST_PREDEF_WORKAROUND_H 10 11 /* tag::reference[] 12 13 = `BOOST_PREDEF_WORKAROUND` 14 15 [source] 16 ---- 17 BOOST_PREDEF_WORKAROUND(symbol,comp,major,minor,patch) 18 ---- 19 20 Usage: 21 22 [source] 23 ---- 24 #if BOOST_PREDEF_WORKAROUND(BOOST_COMP_CLANG,<,3,0,0) 25 // Workaround for old clang compilers.. 26 #endif 27 ---- 28 29 Defines a comparison against two version numbers that depends on the definion 30 of `BOOST_STRICT_CONFIG`. When `BOOST_STRICT_CONFIG` is defined this will expand 31 to a value convertible to `false`. Which has the effect of disabling all code 32 conditionally guarded by `BOOST_PREDEF_WORKAROUND`. When `BOOST_STRICT_CONFIG` 33 is undefine this expand to test the given `symbol` version value with the 34 `comp` comparison against `BOOST_VERSION_NUMBER(major,minor,patch)`. 35 36 */ // end::reference[] 37 #ifdef BOOST_STRICT_CONFIG 38 # define BOOST_PREDEF_WORKAROUND(symbol, comp, major, minor, patch) (0) 39 #else 40 # include <boost/predef/version_number.h> 41 # define BOOST_PREDEF_WORKAROUND(symbol, comp, major, minor, patch) \ 42 ( (symbol) != (0) ) && \ 43 ( (symbol) comp (BOOST_VERSION_NUMBER( (major) , (minor) , (patch) )) ) 44 #endif 45 46 /* tag::reference[] 47 48 = `BOOST_PREDEF_TESTED_AT` 49 50 [source] 51 ---- 52 BOOST_PREDEF_TESTED_AT(symbol,major,minor,patch) 53 ---- 54 55 Usage: 56 57 [source] 58 ---- 59 #if BOOST_PREDEF_TESTED_AT(BOOST_COMP_CLANG,3,5,0) 60 // Needed for clang, and last checked for 3.5.0. 61 #endif 62 ---- 63 64 Defines a comparison against two version numbers that depends on the definion 65 of `BOOST_STRICT_CONFIG` and `BOOST_DETECT_OUTDATED_WORKAROUNDS`. 66 When `BOOST_STRICT_CONFIG` is defined this will expand to a value convertible 67 to `false`. Which has the effect of disabling all code 68 conditionally guarded by `BOOST_PREDEF_TESTED_AT`. When `BOOST_STRICT_CONFIG` 69 is undefined this expand to either: 70 71 * A value convertible to `true` when `BOOST_DETECT_OUTDATED_WORKAROUNDS` is not 72 defined. 73 * A value convertible `true` when the expansion of 74 `BOOST_PREDEF_WORKAROUND(symbol, <=, major, minor, patch)` is `true` and 75 `BOOST_DETECT_OUTDATED_WORKAROUNDS` is defined. 76 * A compile error when the expansion of 77 `BOOST_PREDEF_WORKAROUND(symbol, >, major, minor, patch)` is true and 78 `BOOST_DETECT_OUTDATED_WORKAROUNDS` is defined. 79 80 */ // end::reference[] 81 #ifdef BOOST_STRICT_CONFIG 82 # define BOOST_PREDEF_TESTED_AT(symbol, major, minor, patch) (0) 83 #else 84 # ifdef BOOST_DETECT_OUTDATED_WORKAROUNDS 85 # define BOOST_PREDEF_TESTED_AT(symbol, major, minor, patch) ( \ 86 BOOST_PREDEF_WORKAROUND(symbol, <=, major, minor, patch) \ 87 ? 1 \ 88 : (1%0) ) 89 # else 90 # define BOOST_PREDEF_TESTED_AT(symbol, major, minor, patch) \ 91 ( (symbol) >= BOOST_VERSION_NUMBER_AVAILABLE ) 92 # endif 93 #endif 94 95 #endif 96