整理

include/boost/predef/other/workaround.h

@@ -0,0 +1,95 @@
+/*
+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