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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 
31 /**
32  * This header sets up some constants based on the state of C++11 support
33  */
34 
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  #ifndef _WEBSOCKETPP_MOVE_SEMANTICS_
84  #define _WEBSOCKETPP_MOVE_SEMANTICS_
85  #endif
86  #ifndef _WEBSOCKETPP_DEFAULT_DELETE_FUNCTIONS_
87  #define _WEBSOCKETPP_DEFAULT_DELETE_FUNCTIONS_
88  #endif
89 
90  #ifndef __GNUC__
91  // GCC as of version 4.9 (latest) does not support std::put_time yet.
92  // so ignore it
93  #define _WEBSOCKETPP_PUTTIME_
94  #endif
95 #else
96  // In the absence of a blanket define, try to use compiler versions or
97  // feature testing macros to selectively enable what we can.
98 
99  // Test for noexcept
100  #ifndef _WEBSOCKETPP_NOEXCEPT_TOKEN_
101  #ifdef _WEBSOCKETPP_NOEXCEPT_
102  // build system says we have noexcept
103  #define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
104  #else
105  #if __has_feature(cxx_noexcept)
106  // clang feature detect says we have noexcept
107  #define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
108  #elif defined(_MSC_VER) && _MSC_VER >= 1900
109  // Visual Studio 2015+ has noexcept
110  #define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
111  #else
112  // assume we don't have noexcept
113  #define _WEBSOCKETPP_NOEXCEPT_TOKEN_
114  #endif
115  #endif
116  #endif
117 
118  // Test for constexpr
119  #ifndef _WEBSOCKETPP_CONSTEXPR_TOKEN_
120  #ifdef _WEBSOCKETPP_CONSTEXPR_
121  // build system says we have constexpr
122  #define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
123  #else
124  #if __has_feature(cxx_constexpr)
125  // clang feature detect says we have constexpr
126  #define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
127  #elif defined(_MSC_VER) && _MSC_VER >= 1900
128  // Visual Studio 2015+ has constexpr
129  #define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
130  #else
131  // assume we don't have constexpr
132  #define _WEBSOCKETPP_CONSTEXPR_TOKEN_
133  #endif
134  #endif
135  #endif
136 
137  // Enable initializer lists on clang when available.
138  #if __has_feature(cxx_generalized_initializers) && !defined(_WEBSOCKETPP_INITIALIZER_LISTS_)
139  #define _WEBSOCKETPP_INITIALIZER_LISTS_
140  #endif
141 
142  // Test for nullptr
143  #ifndef _WEBSOCKETPP_NULLPTR_TOKEN_
144  #ifdef _WEBSOCKETPP_NULLPTR_
145  // build system says we have nullptr
146  #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
147  #else
148  #if __has_feature(cxx_nullptr)
149  // clang feature detect says we have nullptr
150  #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
151  #elif defined(_MSC_VER) &&_MSC_VER >= 1600
152  // Visual Studio version that has nullptr
153  #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
154  #else
155  // assume we don't have nullptr
156  #define _WEBSOCKETPP_NULLPTR_TOKEN_ 0
157  #endif
158  #endif
159  #endif
160 #endif
161 
162 #endif // WEBSOCKETPP_COMMON_CPP11_HPP
#define __has_extension
#define __has_feature(x)