nil.hpp

00001 //
00002 // MessagePack for C++ static resolution routine
00003 //
00004 // Copyright (C) 2008-2009 FURUHASHI Sadayuki
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_TYPE_NIL_HPP
00011 #define MSGPACK_TYPE_NIL_HPP
00012 
00013 #include "msgpack/versioning.hpp"
00014 #include "msgpack/adaptor/adaptor_base.hpp"
00015 
00016 namespace msgpack {
00017 
00018 /// @cond
00019 MSGPACK_API_VERSION_NAMESPACE(v1) {
00020 /// @endcond
00021 
00022 namespace type {
00023 
00024 struct nil_t { };
00025 
00026 #if !defined(MSGPACK_DISABLE_LEGACY_NIL)
00027 
00028 typedef nil_t nil;
00029 
00030 #endif // !defined(MSGPACK_DISABLE_LEGACY_NIL)
00031 
00032 inline bool operator<(nil_t const& lhs, nil_t const& rhs) {
00033     return &lhs < &rhs;
00034 }
00035 
00036 inline bool operator==(nil_t const& lhs, nil_t const& rhs) {
00037     return &lhs == &rhs;
00038 }
00039 
00040 }  // namespace type
00041 
00042 namespace adaptor {
00043 
00044 template <>
00045 struct convert<type::nil_t> {
00046     msgpack::object const& operator()(msgpack::object const& o, type::nil_t&) const {
00047         if(o.type != msgpack::type::NIL) { 
00048 //            throw msgpack::type_error();
00049         }
00050         return o;
00051     }
00052 };
00053 
00054 template <>
00055 struct pack<type::nil_t> {
00056     template <typename Stream>
00057     msgpack::packer<Stream> & operator()(msgpack::packer<Stream> & o, const type::nil_t&) const {
00058         o.pack_nil();
00059         return o;
00060     }
00061 };
00062 
00063 template <>
00064 struct object<type::nil_t> {
00065     void operator()(msgpack::object& o, type::nil_t) const {
00066         o.type = msgpack::type::NIL;
00067     }
00068 };
00069 
00070 template <>
00071 struct object_with_zone<type::nil_t> {
00072     void operator()(msgpack::object::with_zone& o, type::nil_t v) const {
00073         static_cast<msgpack::object&>(o) << v;
00074     }
00075 };
00076 
00077 } // namespace adaptor
00078 
00079 template <>
00080 inline void msgpack::object::as<void>() const
00081 {
00082     msgpack::type::nil_t v;
00083     convert(v);
00084 }
00085 
00086 /// @cond
00087 }  // MSGPACK_API_VERSION_NAMESPACE(v1)
00088 /// @endcond
00089 
00090 }  // namespace msgpack
00091 
00092 #endif // MSGPACK_TYPE_NIL_HPP