/*
 * 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_CONSTEXPR_TOKEN_ constexpr
	#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
	
	// Test for constexpr
	#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
	
	// Enable initializer lists on clang when available.
	#if __has_feature(cxx_generalized_initializers)
		#define _WEBSOCKETPP_INITIALIZER_LISTS_
	#endif
#endif

#endif // WEBSOCKETPP_COMMON_CPP11_HPP