Squashed 'src/websocketpp/' content from commit 875d420

git-subtree-dir: src/websocketpp
git-subtree-split: 875d420952d2c47d38de15952a401f00773cdffc

websocketpp/common/cpp11.hpp

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+/*
+ * Copyright (c) 2014, Peter Thorson. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the WebSocket++ Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL PETER THORSON BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef WEBSOCKETPP_COMMON_CPP11_HPP
+#define WEBSOCKETPP_COMMON_CPP11_HPP
+
+/**
+ * This header sets up some constants based on the state of C++11 support
+ */
+
+// Hide clang feature detection from other compilers
+#ifndef __has_feature         // Optional of course.
+  #define __has_feature(x) 0  // Compatibility with non-clang compilers.
+#endif
+#ifndef __has_extension
+  #define __has_extension __has_feature // Compatibility with pre-3.0 compilers.
+#endif
+
+// The code below attempts to use information provided by the build system or
+// user supplied defines to selectively enable C++11 language and library
+// features. In most cases features that are targeted individually may also be
+// selectively disabled via an associated _WEBSOCKETPP_NOXXX_ define.
+
+#if defined(_WEBSOCKETPP_CPP11_STL_) || __cplusplus >= 201103L || defined(_WEBSOCKETPP_CPP11_STRICT_)
+    // This check tests for blanket c++11 coverage. It can be activated in one
+    // of three ways. Either the compiler itself reports that it is a full 
+    // C++11 compiler via the __cplusplus macro or the user/build system
+    // supplies one of the two preprocessor defines below:
+    
+    // _WEBSOCKETPP_CPP11_STRICT_
+    //
+    // This define reports to WebSocket++ that 100% of the language and library
+    // features of C++11 are available. Using this define on a non-C++11
+    // compiler will result in problems.
+    
+    // _WEBSOCKETPP_CPP11_STL_ 
+    //
+    // This define enables *most* C++11 options that were implemented early on
+    // by compilers. It is typically used for compilers that have many, but not
+    // all C++11 features. It should be safe to use on GCC 4.7-4.8 and perhaps
+    // earlier. 
+    #ifndef _WEBSOCKETPP_NOEXCEPT_TOKEN_
+        #define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
+    #endif
+    #ifndef _WEBSOCKETPP_CONSTEXPR_TOKEN_
+        #define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
+    #endif
+    #ifndef _WEBSOCKETPP_INITIALIZER_LISTS_
+        #define _WEBSOCKETPP_INITIALIZER_LISTS_
+    #endif
+    #ifndef _WEBSOCKETPP_NULLPTR_TOKEN_
+        #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
+    #endif
+    
+    #ifndef __GNUC__
+        // GCC as of version 4.9 (latest) does not support std::put_time yet.
+        // so ignore it
+        #define _WEBSOCKETPP_PUTTIME_
+    #endif
+#else
+    // In the absence of a blanket define, try to use compiler versions or
+    // feature testing macros to selectively enable what we can.
+
+    // Test for noexcept
+    #ifndef _WEBSOCKETPP_NOEXCEPT_TOKEN_
+        #ifdef _WEBSOCKETPP_NOEXCEPT_
+            // build system says we have noexcept
+            #define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
+        #else
+            #if __has_feature(cxx_noexcept)
+                // clang feature detect says we have noexcept
+                #define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
+            #else
+                // assume we don't have noexcept
+                #define _WEBSOCKETPP_NOEXCEPT_TOKEN_
+            #endif
+        #endif
+    #endif
+
+    // Test for constexpr
+    #ifndef _WEBSOCKETPP_CONSTEXPR_TOKEN_
+        #ifdef _WEBSOCKETPP_CONSTEXPR_
+            // build system says we have constexpr
+            #define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
+        #else
+            #if __has_feature(cxx_constexpr)
+                // clang feature detect says we have constexpr
+                #define _WEBSOCKETPP_CONSTEXPR_TOKEN_ constexpr
+            #else
+                // assume we don't have constexpr
+                #define _WEBSOCKETPP_CONSTEXPR_TOKEN_
+            #endif
+        #endif
+    #endif
+
+    // Enable initializer lists on clang when available.
+    #if __has_feature(cxx_generalized_initializers) && !defined(_WEBSOCKETPP_INITIALIZER_LISTS_)
+        #define _WEBSOCKETPP_INITIALIZER_LISTS_
+    #endif
+    
+    // Test for nullptr
+    #ifndef _WEBSOCKETPP_NULLPTR_TOKEN_
+        #ifdef _WEBSOCKETPP_NULLPTR_
+            // build system says we have nullptr
+            #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
+        #else
+            #if __has_feature(cxx_nullptr)
+                // clang feature detect says we have nullptr
+                #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
+            #elif _MSC_VER >= 1600
+                // Visual Studio version that has nullptr
+                #define _WEBSOCKETPP_NULLPTR_TOKEN_ nullptr
+            #else
+                // assume we don't have nullptr
+                #define _WEBSOCKETPP_NULLPTR_TOKEN_ 0
+            #endif
+        #endif
+    #endif
+#endif
+
+#endif // WEBSOCKETPP_COMMON_CPP11_HPP