proton/null.hpp

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00001 #ifndef PROTON_NULL_HPP
00002 #define PROTON_NULL_HPP
00003 
00004 /*
00005  *
00006  * Licensed to the Apache Software Foundation (ASF) under one
00007  * or more contributor license agreements.  See the NOTICE file
00008  * distributed with this work for additional information
00009  * regarding copyright ownership.  The ASF licenses this file
00010  * to you under the Apache License, Version 2.0 (the
00011  * "License"); you may not use this file except in compliance
00012  * with the License.  You may obtain a copy of the License at
00013  *
00014  *   http://www.apache.org/licenses/LICENSE-2.0
00015  *
00016  * Unless required by applicable law or agreed to in writing,
00017  * software distributed under the License is distributed on an
00018  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
00019  * KIND, either express or implied.  See the License for the
00020  * specific language governing permissions and limitations
00021  * under the License.
00022  *
00023  */
00024 
00027 
00028 #include "./internal/config.hpp"
00029 #include "./internal/comparable.hpp"
00030 #include "./internal/export.hpp"
00031 
00032 #include <iosfwd>
00033 
00034 namespace proton {
00035 
00039 class null : private internal::comparable<null> {
00040   public:
00041     null() {}
00042 #if PN_CPP_HAS_NULLPTR
00044     null(decltype(nullptr)) {}
00045 #endif
00047   friend bool operator==(const null&, const null&) { return true; }
00049   friend bool operator<(const null&, const null&) { return false; }
00050 };
00051 
00053 PN_CPP_EXTERN std::ostream& operator<<(std::ostream&, const null&);
00054 
00055 }
00056 
00057 #endif // PROTON_NULL_HPP

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