websocketpp  0.4.0
C++/Boost Asio based websocket client/server library
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functional.hpp
1 /*
2  * Copyright (c) 2014, Peter Thorson. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions are met:
6  * * Redistributions of source code must retain the above copyright
7  * notice, this list of conditions and the following disclaimer.
8  * * Redistributions in binary form must reproduce the above copyright
9  * notice, this list of conditions and the following disclaimer in the
10  * documentation and/or other materials provided with the distribution.
11  * * Neither the name of the WebSocket++ Project nor the
12  * names of its contributors may be used to endorse or promote products
13  * derived from this software without specific prior written permission.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED. IN NO EVENT SHALL PETER THORSON BE LIABLE FOR ANY
19  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
22  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
24  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  *
26  */
27 
28 #ifndef WEBSOCKETPP_COMMON_FUNCTIONAL_HPP
29 #define WEBSOCKETPP_COMMON_FUNCTIONAL_HPP
30 
31 #if defined _WEBSOCKETPP_CPP11_STL_ && !defined _WEBSOCKETPP_NO_CPP11_FUNCTIONAL_
32  #ifndef _WEBSOCKETPP_CPP11_FUNCTIONAL_
33  #define _WEBSOCKETPP_CPP11_FUNCTIONAL_
34  #endif
35 #endif
36 
37 #ifdef _WEBSOCKETPP_CPP11_FUNCTIONAL_
38  #include <functional>
39 #else
40  #include <boost/bind.hpp>
41  #include <boost/function.hpp>
42  #include <boost/ref.hpp>
43 #endif
44 
45 
46 
47 namespace websocketpp {
48 namespace lib {
49 
50 #ifdef _WEBSOCKETPP_CPP11_FUNCTIONAL_
51  using std::function;
52  using std::bind;
53  using std::ref;
54  namespace placeholders = std::placeholders;
55 
56  // There are some cases where a C++11 compiler balks at using std::ref
57  // but a C++03 compiler using boost function requires boost::ref. As such
58  // lib::ref is not useful in these cases. Instead this macro allows the use
59  // of boost::ref in the case of a boost compile or no reference wrapper at
60  // all in the case of a C++11 compile
61  #define _WEBSOCKETPP_REF(x) x
62 
63  template <typename T>
64  void clear_function(T & x) {
65  x = nullptr;
66  }
67 #else
68  using boost::function;
69  using boost::bind;
70  using boost::ref;
71  namespace placeholders {
73  using ::_1;
74  using ::_2;
75  }
76 
77  // See above definition for more details on what this is and why it exists
78  #define _WEBSOCKETPP_REF(x) boost::ref(x)
79 
80  template <typename T>
81  void clear_function(T & x) {
82  x.clear();
83  }
84 #endif
85 
86 } // namespace lib
87 } // namespace websocketpp
88 
89 #endif // WEBSOCKETPP_COMMON_FUNCTIONAL_HPP
Namespace for the WebSocket++ project.
Definition: base64.hpp:41