half.hpp

// half - IEEE 754-based half-precision floating point library.
//
// Copyright (c) 2012-2017 Christian Rau <rauy@users.sourceforge.net>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
// modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

// Version 1.12.0

/// \file
/// Main header file for half precision functionality.

#ifndef HALF_HALF_HPP
#define HALF_HALF_HPP

/// Combined gcc version number.
#define HALF_GNUC_VERSION (__GNUC__*100+__GNUC_MINOR__)

//check C++11 language features
#if defined(__clang__)										//clang
	#if __has_feature(cxx_static_assert) && !defined(HALF_ENABLE_CPP11_STATIC_ASSERT)
		#define HALF_ENABLE_CPP11_STATIC_ASSERT 1
	#endif
	#if __has_feature(cxx_constexpr) && !defined(HALF_ENABLE_CPP11_CONSTEXPR)
		#define HALF_ENABLE_CPP11_CONSTEXPR 1
	#endif
	#if __has_feature(cxx_noexcept) && !defined(HALF_ENABLE_CPP11_NOEXCEPT)
		#define HALF_ENABLE_CPP11_NOEXCEPT 1
	#endif
	#if __has_feature(cxx_user_literals) && !defined(HALF_ENABLE_CPP11_USER_LITERALS)
		#define HALF_ENABLE_CPP11_USER_LITERALS 1
	#endif
	#if (defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L) && !defined(HALF_ENABLE_CPP11_LONG_LONG)
		#define HALF_ENABLE_CPP11_LONG_LONG 1
	#endif
/*#elif defined(__INTEL_COMPILER)								//Intel C++
	#if __INTEL_COMPILER >= 1100 && !defined(HALF_ENABLE_CPP11_STATIC_ASSERT)		????????
		#define HALF_ENABLE_CPP11_STATIC_ASSERT 1
	#endif
	#if __INTEL_COMPILER >= 1300 && !defined(HALF_ENABLE_CPP11_CONSTEXPR)			????????
		#define HALF_ENABLE_CPP11_CONSTEXPR 1
	#endif
	#if __INTEL_COMPILER >= 1300 && !defined(HALF_ENABLE_CPP11_NOEXCEPT)			????????
		#define HALF_ENABLE_CPP11_NOEXCEPT 1
	#endif
	#if __INTEL_COMPILER >= 1100 && !defined(HALF_ENABLE_CPP11_LONG_LONG)			????????
		#define HALF_ENABLE_CPP11_LONG_LONG 1
	#endif*/
#elif defined(__GNUC__)										//gcc
	#if defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L
		#if HALF_GNUC_VERSION >= 403 && !defined(HALF_ENABLE_CPP11_STATIC_ASSERT)
			#define HALF_ENABLE_CPP11_STATIC_ASSERT 1
		#endif
		#if HALF_GNUC_VERSION >= 406 && !defined(HALF_ENABLE_CPP11_CONSTEXPR)
			#define HALF_ENABLE_CPP11_CONSTEXPR 1
		#endif
		#if HALF_GNUC_VERSION >= 406 && !defined(HALF_ENABLE_CPP11_NOEXCEPT)
			#define HALF_ENABLE_CPP11_NOEXCEPT 1
		#endif
		#if HALF_GNUC_VERSION >= 407 && !defined(HALF_ENABLE_CPP11_USER_LITERALS)
			#define HALF_ENABLE_CPP11_USER_LITERALS 1