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/*
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* Copyright (C) 2011-2013 Daniel Scharrer |
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* |
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* This software is provided 'as-is', without any express or implied |
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* warranty. In no event will the author(s) be held liable for any damages |
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* arising from the use of this software. |
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* |
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* Permission is granted to anyone to use this software for any purpose, |
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* including commercial applications, and to alter it and redistribute it |
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* freely, subject to the following restrictions: |
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* |
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* 1. The origin of this software must not be misrepresented; you must not |
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* claim that you wrote the original software. If you use this software |
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* in a product, an acknowledgment in the product documentation would be |
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* appreciated but is not required. |
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* 2. Altered source versions must be plainly marked as such, and must not be |
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* misrepresented as being the original software. |
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* 3. This notice may not be removed or altered from any source distribution. |
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*/ |
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/*!
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* Utility functions for dealing with alignment of objects. |
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*/ |
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#ifndef INNOEXTRACT_UTIL_ALIGN_HPP |
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#define INNOEXTRACT_UTIL_ALIGN_HPP |
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#include <limits> |
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#include "util/math.hpp" |
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#include "configure.hpp" |
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namespace util { |
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//! Get the alignment of a type.
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template <class T> |
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unsigned int alignment_of() { |
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#if INNOEXTRACT_HAVE_ALIGNOF |
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return alignof(T); |
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#elif defined(_MSC_VER) && _MSC_VER >= 1300 |
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return __alignof(T); |
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#elif defined(__GNUC__) |
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return __alignof__(T); |
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#else |
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return sizeof(T); |
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#endif |
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} |
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//! Check if a pointer has aparticular alignment.
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inline bool is_aligned_on(const void * p, size_t alignment) { |
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return alignment == 1 |
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|| (is_power_of_2(alignment) ? mod_power_of_2(size_t(p), alignment) == 0 |
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: size_t(p) % alignment == 0); |
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} |
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//! Check if a pointer is aligned for a specific type.
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template <class T> |
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bool is_aligned(const void * p) { |
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return is_aligned_on(p, alignment_of<T>()); |
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} |
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} // namespace util
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#endif // INNOEXTRACT_UTIL_ALIGN_HPP
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