websocketpp  0.4.0
C++/Boost Asio based websocket client/server library
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Pages
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  // _WEBSOCKETPP_CPP11_STRICT_
55  //
56  // This define reports to WebSocket++ that 100% of the language and library
57  // features of C++11 are available. Using this define on a non-C++11
58  // compiler will result in problems.
59 
60  // _WEBSOCKETPP_CPP11_STL_
61  //
62  // This define enables *most* C++11 options that were implemented early on
63  // by compilers. It is typically used for compilers that have many, but not
64  // all C++11 features. It should be safe to use on GCC 4.7-4.8 and perhaps
65  // earlier.
66  #ifndef _WEBSOCKETPP_NOEXCEPT_TOKEN_
67  #define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
68  #endif
69  #ifndef _WEBSOCKETPP_CONSTEXPR_TOKEN_
70  #define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
71  #endif
72  #ifndef _WEBSOCKETPP_INITIALIZER_LISTS_
73  #define _WEBSOCKETPP_INITIALIZER_LISTS_
74  #endif
75  #ifndef _WEBSOCKETPP_NULLPTR_TOKEN_
76  #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
77  #endif
78 
79  #ifndef __GNUC__
80  // GCC as of version 4.9 (latest) does not support std::put_time yet.
81  // so ignore it
82  #define _WEBSOCKETPP_PUTTIME_
83  #endif
84 #else
85  // In the absence of a blanket define, try to use compiler versions or
86  // feature testing macros to selectively enable what we can.
87 
88  // Test for noexcept
89  #ifndef _WEBSOCKETPP_NOEXCEPT_TOKEN_
90  #ifdef _WEBSOCKETPP_NOEXCEPT_
91  // build system says we have noexcept
92  #define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
93  #else
94  #if __has_feature(cxx_noexcept)
95  // clang feature detect says we have noexcept
96  #define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
97  #else
98  // assume we don't have noexcept
99  #define _WEBSOCKETPP_NOEXCEPT_TOKEN_
100  #endif
101  #endif
102  #endif
103 
104  // Test for constexpr
105  #ifndef _WEBSOCKETPP_CONSTEXPR_TOKEN_
106  #ifdef _WEBSOCKETPP_CONSTEXPR_
107  // build system says we have constexpr
108  #define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
109  #else
110  #if __has_feature(cxx_constexpr)
111  // clang feature detect says we have constexpr
112  #define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
113  #else
114  // assume we don't have constexpr
115  #define _WEBSOCKETPP_CONSTEXPR_TOKEN_
116  #endif
117  #endif
118  #endif
119 
120  // Enable initializer lists on clang when available.
121  #if __has_feature(cxx_generalized_initializers) && !defined(_WEBSOCKETPP_INITIALIZER_LISTS_)
122  #define _WEBSOCKETPP_INITIALIZER_LISTS_
123  #endif
124 
125  // Test for nullptr
126  #ifndef _WEBSOCKETPP_NULLPTR_TOKEN_
127  #ifdef _WEBSOCKETPP_NULLPTR_
128  // build system says we have nullptr
129  #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
130  #else
131  #if __has_feature(cxx_nullptr)
132  // clang feature detect says we have nullptr
133  #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
134  #elif _MSC_VER >= 1600
135  // Visual Studio version that has nullptr
136  #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
137  #else
138  // assume we don't have nullptr
139  #define _WEBSOCKETPP_NULLPTR_TOKEN_ 0
140  #endif
141  #endif
142  #endif
143 #endif
144 
145 #endif // WEBSOCKETPP_COMMON_CPP11_HPP