websocketpp  0.5.1
C++/Boost Asio based websocket client/server library
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cpp11.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_CPP11_HPP
29 #define WEBSOCKETPP_COMMON_CPP11_HPP
30 
35 // Hide clang feature detection from other compilers
36 #ifndef __has_feature // Optional of course.
37  #define __has_feature(x) 0 // Compatibility with non-clang compilers.
38 #endif
39 #ifndef __has_extension
40  #define __has_extension __has_feature // Compatibility with pre-3.0 compilers.
41 #endif
42 
43 // The code below attempts to use information provided by the build system or
44 // user supplied defines to selectively enable C++11 language and library
45 // features. In most cases features that are targeted individually may also be
46 // selectively disabled via an associated _WEBSOCKETPP_NOXXX_ define.
47 
48 #if defined(_WEBSOCKETPP_CPP11_STL_) || __cplusplus >= 201103L || defined(_WEBSOCKETPP_CPP11_STRICT_)
49  // This check tests for blanket c++11 coverage. It can be activated in one
50  // of three ways. Either the compiler itself reports that it is a full
51  // C++11 compiler via the __cplusplus macro or the user/build system
52  // supplies one of the two preprocessor defines below:
53 
54  // This is defined to allow other WebSocket++ common headers to enable
55  // C++11 features when they are detected by this file rather than
56  // duplicating the above logic in every common header.
57  #define _WEBSOCKETPP_CPP11_INTERNAL_
58 
59  // _WEBSOCKETPP_CPP11_STRICT_
60  //
61  // This define reports to WebSocket++ that 100% of the language and library
62  // features of C++11 are available. Using this define on a non-C++11
63  // compiler will result in problems.
64 
65  // _WEBSOCKETPP_CPP11_STL_
66  //
67  // This define enables *most* C++11 options that were implemented early on
68  // by compilers. It is typically used for compilers that have many, but not
69  // all C++11 features. It should be safe to use on GCC 4.7-4.8 and perhaps
70  // earlier.
71  #ifndef _WEBSOCKETPP_NOEXCEPT_TOKEN_
72  #define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
73  #endif
74  #ifndef _WEBSOCKETPP_CONSTEXPR_TOKEN_
75  #define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
76  #endif
77  #ifndef _WEBSOCKETPP_INITIALIZER_LISTS_
78  #define _WEBSOCKETPP_INITIALIZER_LISTS_
79  #endif
80  #ifndef _WEBSOCKETPP_NULLPTR_TOKEN_
81  #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
82  #endif
83 
84  #ifndef __GNUC__
85  // GCC as of version 4.9 (latest) does not support std::put_time yet.
86  // so ignore it
87  #define _WEBSOCKETPP_PUTTIME_
88  #endif
89 #else
90  // In the absence of a blanket define, try to use compiler versions or
91  // feature testing macros to selectively enable what we can.
92 
93  // Test for noexcept
94  #ifndef _WEBSOCKETPP_NOEXCEPT_TOKEN_
95  #ifdef _WEBSOCKETPP_NOEXCEPT_
96  // build system says we have noexcept
97  #define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
98  #else
99  #if __has_feature(cxx_noexcept)
100  // clang feature detect says we have noexcept
101  #define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
102  #else
103  // assume we don't have noexcept
104  #define _WEBSOCKETPP_NOEXCEPT_TOKEN_
105  #endif
106  #endif
107  #endif
108 
109  // Test for constexpr
110  #ifndef _WEBSOCKETPP_CONSTEXPR_TOKEN_
111  #ifdef _WEBSOCKETPP_CONSTEXPR_
112  // build system says we have constexpr
113  #define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
114  #else
115  #if __has_feature(cxx_constexpr)
116  // clang feature detect says we have constexpr
117  #define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
118  #else
119  // assume we don't have constexpr
120  #define _WEBSOCKETPP_CONSTEXPR_TOKEN_
121  #endif
122  #endif
123  #endif
124 
125  // Enable initializer lists on clang when available.
126  #if __has_feature(cxx_generalized_initializers) && !defined(_WEBSOCKETPP_INITIALIZER_LISTS_)
127  #define _WEBSOCKETPP_INITIALIZER_LISTS_
128  #endif
129 
130  // Test for nullptr
131  #ifndef _WEBSOCKETPP_NULLPTR_TOKEN_
132  #ifdef _WEBSOCKETPP_NULLPTR_
133  // build system says we have nullptr
134  #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
135  #else
136  #if __has_feature(cxx_nullptr)
137  // clang feature detect says we have nullptr
138  #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
139  #elif _MSC_VER >= 1600
140  // Visual Studio version that has nullptr
141  #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
142  #else
143  // assume we don't have nullptr
144  #define _WEBSOCKETPP_NULLPTR_TOKEN_ 0
145  #endif
146  #endif
147  #endif
148 #endif
149 
150 #endif // WEBSOCKETPP_COMMON_CPP11_HPP