versioning.hpp

00001 /*
00002  * MessagePack for C++ version switcher
00003  *
00004  * Copyright (C) 2014 KONDO Takatoshi
00005  *
00006  *    Distributed under the Boost Software License, Version 1.0.
00007  *    (See accompanying file LICENSE_1_0.txt or copy at
00008  *    http://www.boost.org/LICENSE_1_0.txt)
00009  */
00010 #ifndef MSGPACK_VERSIONING_HPP
00011 #define MSGPACK_VERSIONING_HPP
00012 
00013 #if !defined(MSGPACK_DEFAULT_API_VERSION)
00014 #define MSGPACK_DEFAULT_API_VERSION 1
00015 #endif
00016 
00017 #define MSGPACK_DEFAULT_API_NS MSGPACK_DETAIL_PP_CAT(v, MSGPACK_DEFAULT_API_VERSION)
00018 
00019 #if   MSGPACK_DEFAULT_API_VERSION == 1
00020 #define MSGPACK_DETAIL_PP_ENABLE_NS_v1 ()
00021 //#elif MSGPACK_DEFAULT_API_VERSION == 2
00022 //#define MSGPACK_DETAIL_PP_ENABLE_NS_v2 ()
00023 #else
00024 #error
00025 #endif
00026 
00027 #define MSGPACK_DETAIL_PP_CAT(a, ...) MSGPACK_DETAIL_PP_PRIMITIVE_CAT(a, __VA_ARGS__)
00028 #define MSGPACK_DETAIL_PP_PRIMITIVE_CAT(a, ...) a ## __VA_ARGS__
00029 
00030 #define MSGPACK_DETAIL_PP_IIF(c) MSGPACK_DETAIL_PP_PRIMITIVE_CAT(MSGPACK_DETAIL_PP_IIF_, c)
00031 #define MSGPACK_DETAIL_PP_IIF_0(t, ...) __VA_ARGS__
00032 #define MSGPACK_DETAIL_PP_IIF_1(t, ...) t
00033 
00034 #define MSGPACK_DETAIL_PP_PROBE(x) x, 1
00035 
00036 #if defined(_MSC_VER)
00037 
00038 #define MSGPACK_DETAIL_PP_MSVC_VA_ARGS_WORKAROUND(define, args) define args
00039 #define MSGPACK_DETAIL_PP_CHECK(...) MSGPACK_DETAIL_PP_MSVC_VA_ARGS_WORKAROUND(MSGPACK_DETAIL_PP_CHECK_N, (__VA_ARGS__, 0))
00040 #define MSGPACK_DETAIL_PP_CHECK_N(x, n, ...) n
00041 
00042 #else  // defined(__MSC_VER)
00043 
00044 #define MSGPACK_DETAIL_PP_CHECK(...) MSGPACK_DETAIL_PP_CHECK_N(__VA_ARGS__, 0)
00045 #define MSGPACK_DETAIL_PP_CHECK_N(x, n, ...) n
00046 
00047 #endif // defined(__MSC_VER)
00048 
00049 
00050 #define MSGPACK_DETAIL_PP_NS_ENABLED_PROBE(ns)            MSGPACK_DETAIL_PP_NS_ENABLED_PROBE_PROXY( MSGPACK_DETAIL_PP_ENABLE_NS_##ns )
00051 #define MSGPACK_DETAIL_PP_NS_ENABLED_PROBE_PROXY(...)     MSGPACK_DETAIL_PP_NS_ENABLED_PROBE_PRIMIVIE(__VA_ARGS__)
00052 #define MSGPACK_DETAIL_PP_NS_ENABLED_PROBE_PRIMIVIE(x)    MSGPACK_DETAIL_PP_NS_ENABLED_PROBE_COMBINE_ x
00053 #define MSGPACK_DETAIL_PP_NS_ENABLED_PROBE_COMBINE_(...)  MSGPACK_DETAIL_PP_PROBE(~)
00054 
00055 #define MSGPACK_DETAIL_PP_IS_NS_ENABLED(ns) MSGPACK_DETAIL_PP_CHECK(MSGPACK_DETAIL_PP_NS_ENABLED_PROBE(ns))
00056 
00057 #if __cplusplus < 201103L
00058 #define MSGPACK_API_VERSION_NAMESPACE(ns) MSGPACK_DETAIL_PP_IIF(MSGPACK_DETAIL_PP_IS_NS_ENABLED(ns)) \
00059     (namespace ns{}; using namespace ns; namespace ns, \
00060      namespace ns)
00061 
00062 #else  // __cplusplus < 201103L
00063 
00064 #define MSGPACK_API_VERSION_NAMESPACE(ns) MSGPACK_DETAIL_PP_IIF(MSGPACK_DETAIL_PP_IS_NS_ENABLED(ns)) \
00065     (inline namespace ns, namespace ns)
00066 
00067 #endif // __cplusplus < 201103L
00068 
00069 #endif // MSGPACK_VERSIONING_HPP