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Merge pull request #2149 from STEllAR-GROUP/fix_copy_optimized
std::memmove copies bytes, use bytes*sizeof(type) when copying larger…
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| // Copyright (c) 2016 Hartmut Kaiser | ||
| // Copyright (c) 2016 John Biddiscombe | ||
| // | ||
| // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
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| #if !defined(HPX_TRAITS_POINTER_CATEGORY_MAY_10_2016) | ||
| #define HPX_TRAITS_POINTER_CATEGORY_MAY_10_2016 | ||
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| #include <hpx/traits.hpp> | ||
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| #include <type_traits> | ||
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| // Select a copy tag type to enable optimization | ||
| // of copy/move operations if the iterators are | ||
| // pointers and if the value_type is layout compatible. | ||
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| namespace hpx { namespace traits | ||
| { | ||
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| template <typename Source, typename Dest> | ||
| inline general_pointer_tag | ||
| get_pointer_category(Source const&, Dest const&) | ||
| { | ||
| return general_pointer_tag(); | ||
| } | ||
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| #if defined(HPX_HAVE_CXX11_IS_TRIVIALLY_COPYABLE) | ||
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| namespace detail { | ||
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| template <typename Source, typename Dest> | ||
| struct pointer_category | ||
| { | ||
| typedef typename std::conditional< | ||
| std::integral_constant<bool, | ||
| sizeof(Source) == sizeof(Dest) | ||
| >::value && | ||
| std::is_integral<Source>::value && | ||
| std::is_integral<Dest>::value && | ||
| !std::is_volatile<Source>::value && | ||
| !std::is_volatile<Dest>::value && | ||
| (std::is_same<bool, Source>::value == | ||
| std::is_same<bool, Dest>::value), | ||
| trivially_copyable_pointer_tag, | ||
| general_pointer_tag | ||
| >::type type; | ||
| }; | ||
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| // every type is layout-compatible with itself | ||
| template <typename T> | ||
| struct pointer_category<T, T> | ||
| { | ||
| typedef typename std::conditional< | ||
| std::is_trivially_copyable<T>::value, | ||
| trivially_copyable_pointer_tag, | ||
| general_pointer_tag | ||
| >::type type; | ||
| }; | ||
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| // pointers are layout compatible | ||
| template <typename T> | ||
| struct pointer_category<T*, T const*> | ||
| { | ||
| typedef trivially_copyable_pointer_tag type; | ||
| }; | ||
| } | ||
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| // isolate iterators which are pointers and their value_types are | ||
| // assignable | ||
| template <typename Source, typename Dest> | ||
| inline typename std::conditional< | ||
| std::is_assignable<Dest&, Source&>::value, | ||
| typename detail::pointer_category< | ||
| typename std::remove_const<Source>::type, Dest | ||
| >::type, | ||
| general_pointer_tag | ||
| >::type | ||
| get_pointer_category(Source* const&, Dest* const&) | ||
| { | ||
| typedef typename std::conditional< | ||
| std::is_assignable<Dest&, Source&>::value, | ||
| typename detail::pointer_category< | ||
| typename std::remove_const<Source>::type, Dest | ||
| >::type, | ||
| general_pointer_tag | ||
| >::type category_type; | ||
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| return category_type(); | ||
| } | ||
| #endif | ||
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| }} | ||
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| #endif |