author | Simon Howkins <simonh@symbian.org> |
Thu, 28 Oct 2010 12:05:33 +0100 | |
branch | RCL_3 |
changeset 78 | 5b3c983434ca |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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//----------------------------------------------------------------------------- |
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// boost aligned_storage.hpp header file |
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// See http://www.boost.org for updates, documentation, and revision history. |
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//----------------------------------------------------------------------------- |
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// |
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// Copyright (c) 2002-2003 |
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// Eric Friedman, Itay Maman |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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#ifndef BOOST_ALIGNED_STORAGE_HPP |
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#define BOOST_ALIGNED_STORAGE_HPP |
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#include <cstddef> // for std::size_t |
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#include "boost/config.hpp" |
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#include "boost/detail/workaround.hpp" |
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#include "boost/type_traits/alignment_of.hpp" |
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#include "boost/type_traits/type_with_alignment.hpp" |
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#include "boost/type_traits/is_pod.hpp" |
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#include "boost/mpl/eval_if.hpp" |
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#include "boost/mpl/identity.hpp" |
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#include "boost/type_traits/detail/bool_trait_def.hpp" |
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namespace boost { |
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namespace detail { namespace aligned_storage { |
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BOOST_STATIC_CONSTANT( |
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std::size_t |
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, alignment_of_max_align = ::boost::alignment_of<max_align>::value |
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); |
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// |
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// To be TR1 conforming this must be a POD type: |
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// |
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template < |
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std::size_t size_ |
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, std::size_t alignment_ |
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> |
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struct aligned_storage_imp |
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{ |
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union data_t |
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{ |
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char buf[size_]; |
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typename mpl::eval_if_c< |
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alignment_ == std::size_t(-1) |
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, mpl::identity<detail::max_align> |
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, type_with_alignment<alignment_> |
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>::type align_; |
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} data_; |
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}; |
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}} // namespace detail::aligned_storage |
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template < |
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std::size_t size_ |
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, std::size_t alignment_ = std::size_t(-1) |
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> |
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class aligned_storage |
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{ |
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private: // representation |
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detail::aligned_storage::aligned_storage_imp<size_, alignment_> data_; |
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public: // constants |
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typedef detail::aligned_storage::aligned_storage_imp<size_, alignment_> type; |
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BOOST_STATIC_CONSTANT( |
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std::size_t |
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, size = size_ |
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); |
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BOOST_STATIC_CONSTANT( |
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std::size_t |
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, alignment = ( |
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alignment_ == std::size_t(-1) |
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? ::boost::detail::aligned_storage::alignment_of_max_align |
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: alignment_ |
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) |
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); |
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#if defined(__GNUC__) &&\ |
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(__GNUC__ > 3) ||\ |
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(__GNUC__ == 3 && (__GNUC_MINOR__ > 2 ||\ |
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(__GNUC_MINOR__ == 2 && __GNUC_PATCHLEVEL__ >=3))) |
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private: // noncopyable |
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aligned_storage(const aligned_storage&); |
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aligned_storage& operator=(const aligned_storage&); |
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#else // gcc less than 3.2.3 |
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public: // _should_ be noncopyable, but GCC compiler emits error |
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aligned_storage(const aligned_storage&); |
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aligned_storage& operator=(const aligned_storage&); |
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#endif // gcc < 3.2.3 workaround |
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public: // structors |
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aligned_storage() |
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{ |
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} |
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~aligned_storage() |
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{ |
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} |
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public: // accessors |
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void* address() |
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{ |
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return this; |
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} |
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#if !BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
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const void* address() const |
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{ |
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return this; |
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} |
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#else // MSVC6 |
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const void* address() const; |
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#endif // MSVC6 workaround |
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}; |
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
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// MSVC6 seems not to like inline functions with const void* returns, so we |
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// declare the following here: |
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template <std::size_t S, std::size_t A> |
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const void* aligned_storage<S,A>::address() const |
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{ |
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return const_cast< aligned_storage<S,A>* >(this)->address(); |
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} |
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#endif // MSVC6 workaround |
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#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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// |
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// Make sure that is_pod recognises aligned_storage<>::type |
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// as a POD (Note that aligned_storage<> itself is not a POD): |
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// |
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template <std::size_t size_, std::size_t alignment_> |
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struct is_pod<boost::detail::aligned_storage::aligned_storage_imp<size_,alignment_> > |
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BOOST_TT_AUX_BOOL_C_BASE(true) |
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{ |
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BOOST_TT_AUX_BOOL_TRAIT_VALUE_DECL(true) |
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}; |
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#endif |
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} // namespace boost |
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#include "boost/type_traits/detail/bool_trait_undef.hpp" |
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#endif // BOOST_ALIGNED_STORAGE_HPP |