2 * Copyright (c) 2014, Peter Thorson. All rights reserved.
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.
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.
28 #ifndef WEBSOCKETPP_COMMON_CPP11_HPP
29 #define WEBSOCKETPP_COMMON_CPP11_HPP
32 * This header sets up some constants based on the state of C++11 support
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.
39 #ifndef __has_extension
40 #define __has_extension __has_feature // Compatibility with pre-3.0 compilers.
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.
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:
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_
59 // _WEBSOCKETPP_CPP11_STRICT_
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.
65 // _WEBSOCKETPP_CPP11_STL_
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
71 #ifndef _WEBSOCKETPP_NOEXCEPT_TOKEN_
72 #define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
74 #ifndef _WEBSOCKETPP_CONSTEXPR_TOKEN_
75 #define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
77 #ifndef _WEBSOCKETPP_INITIALIZER_LISTS_
78 #define _WEBSOCKETPP_INITIALIZER_LISTS_
80 #ifndef _WEBSOCKETPP_NULLPTR_TOKEN_
81 #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
83 #ifndef _WEBSOCKETPP_MOVE_SEMANTICS_
84 #define _WEBSOCKETPP_MOVE_SEMANTICS_
86 #ifndef _WEBSOCKETPP_DEFAULT_DELETE_FUNCTIONS_
87 #define _WEBSOCKETPP_DEFAULT_DELETE_FUNCTIONS_
91 // GCC as of version 4.9 (latest) does not support std::put_time yet.
93 #define _WEBSOCKETPP_PUTTIME_
96 // In the absence of a blanket define, try to use compiler versions or
97 // feature testing macros to selectively enable what we can.
100 #ifndef _WEBSOCKETPP_NOEXCEPT_TOKEN_
101 #ifdef _WEBSOCKETPP_NOEXCEPT_
102 // build system says we have noexcept
103 #define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
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
112 // assume we don't have noexcept
113 #define _WEBSOCKETPP_NOEXCEPT_TOKEN_
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
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
131 // assume we don't have constexpr
132 #define _WEBSOCKETPP_CONSTEXPR_TOKEN_
137 // Enable initializer lists on clang when available.
138 #if __has_feature(cxx_generalized_initializers) && !defined(_WEBSOCKETPP_INITIALIZER_LISTS_)
139 #define _WEBSOCKETPP_INITIALIZER_LISTS_
143 #ifndef _WEBSOCKETPP_NULLPTR_TOKEN_
144 #ifdef _WEBSOCKETPP_NULLPTR_
145 // build system says we have nullptr
146 #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
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
155 // assume we don't have nullptr
156 #define _WEBSOCKETPP_NULLPTR_TOKEN_ 0
162 #endif // WEBSOCKETPP_COMMON_CPP11_HPP