Initial commit from private 0.3 repository

websocketpp/common/cpp11.hpp

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+/*
+ * Copyright (c) 2012, 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
+
+
+#ifdef _WEBSOCKETPP_CPP11_STL_
+	// This flag indicates that all of the C++11 language features are available
+	// to us.
+	#define _WEBSOCKETPP_NOEXCEPT_TOKEN_ noexcept
+	#define _WEBSOCKETPP_INITIALIZER_LISTS_
+#else
+	// Test for noexcept
+	#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
+	
+	// Enable initializer lists on clang when available.
+	#if __has_feature(cxx_generalized_initializers)
+		#define _WEBSOCKETPP_INITIALIZER_LISTS_
+	#endif
+#endif
+
+#endif // WEBSOCKETPP_COMMON_CPP11_HPP