整理

include/boost/predef/version_number.h

@@ -0,0 +1,74 @@
+/*
+Copyright Rene Rivera 2005-2016
+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_VERSION_NUMBER_H
+#define BOOST_PREDEF_VERSION_NUMBER_H
+
+/* tag::reference[]
+= `BOOST_VERSION_NUMBER`
+
+[source]
+----
+BOOST_VERSION_NUMBER(major,minor,patch)
+----
+
+Defines standard version numbers, with these properties:
+
+* Decimal base whole numbers in the range [0,1000000000).
+  The number range is designed to allow for a (2,2,5) triplet.
+  Which fits within a 32 bit value.
+* The `major` number can be in the [0,99] range.
+* The `minor` number can be in the [0,99] range.
+* The `patch` number can be in the [0,99999] range.
+* Values can be specified in any base. As the defined value
+  is an constant expression.
+* Value can be directly used in both preprocessor and compiler
+  expressions for comparison to other similarly defined values.
+* The implementation enforces the individual ranges for the
+  major, minor, and patch numbers. And values over the ranges
+  are truncated (modulo).
+
+*/ // end::reference[]
+#define BOOST_VERSION_NUMBER(major,minor,patch) \
+    ( (((major)%100)*10000000) + (((minor)%100)*100000) + ((patch)%100000) )
+
+#define BOOST_VERSION_NUMBER_MAX \
+    BOOST_VERSION_NUMBER(99,99,99999)
+
+#define BOOST_VERSION_NUMBER_ZERO \
+    BOOST_VERSION_NUMBER(0,0,0)
+
+#define BOOST_VERSION_NUMBER_MIN \
+    BOOST_VERSION_NUMBER(0,0,1)
+
+#define BOOST_VERSION_NUMBER_AVAILABLE \
+    BOOST_VERSION_NUMBER_MIN
+
+#define BOOST_VERSION_NUMBER_NOT_AVAILABLE \
+    BOOST_VERSION_NUMBER_ZERO
+
+/* tag::reference[]
+[source]
+----
+BOOST_VERSION_NUMBER_MAJOR(N), BOOST_VERSION_NUMBER_MINOR(N), BOOST_VERSION_NUMBER_PATCH(N)
+----
+
+The macros extract the major, minor, and patch portion from a well formed
+version number resulting in a preprocessor expression in the range of
+[0,99] or [0,99999] for the major and minor, or patch numbers
+respectively.
+*/ // end::reference[]
+#define BOOST_VERSION_NUMBER_MAJOR(N) \
+    ( ((N)/10000000)%100 )
+
+#define BOOST_VERSION_NUMBER_MINOR(N) \
+    ( ((N)/100000)%100 )
+
+#define BOOST_VERSION_NUMBER_PATCH(N) \
+    ( (N)%100000 )
+
+#endif