整理

include/boost/align/aligned_allocator.hpp

@@ -0,0 +1,140 @@
+/*
+Copyright 2014-2015 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#ifndef BOOST_ALIGN_ALIGNED_ALLOCATOR_HPP
+#define BOOST_ALIGN_ALIGNED_ALLOCATOR_HPP
+
+#include <boost/align/detail/add_reference.hpp>
+#include <boost/align/detail/is_alignment_constant.hpp>
+#include <boost/align/detail/max_objects.hpp>
+#include <boost/align/detail/max_size.hpp>
+#include <boost/align/detail/throw_exception.hpp>
+#include <boost/align/aligned_alloc.hpp>
+#include <boost/align/aligned_allocator_forward.hpp>
+#include <boost/align/alignment_of.hpp>
+#include <boost/static_assert.hpp>
+#include <new>
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+#include <utility>
+#endif
+
+namespace boost {
+namespace alignment {
+
+template<class T, std::size_t Alignment>
+class aligned_allocator {
+    BOOST_STATIC_ASSERT(detail::is_alignment_constant<Alignment>::value);
+
+public:
+    typedef T value_type;
+    typedef T* pointer;
+    typedef const T* const_pointer;
+    typedef void* void_pointer;
+    typedef const void* const_void_pointer;
+    typedef typename detail::add_lvalue_reference<T>::type reference;
+    typedef typename detail::add_lvalue_reference<const
+        T>::type const_reference;
+    typedef std::size_t size_type;
+    typedef std::ptrdiff_t difference_type;
+    typedef detail::true_type propagate_on_container_move_assignment;
+    typedef detail::true_type is_always_equal;
+
+    template<class U>
+    struct rebind {
+        typedef aligned_allocator<U, Alignment> other;
+    };
+
+#if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS)
+    aligned_allocator() = default;
+#else
+    aligned_allocator() BOOST_NOEXCEPT { }
+#endif
+
+    template<class U>
+    aligned_allocator(const aligned_allocator<U, Alignment>&)
+        BOOST_NOEXCEPT { }
+
+    pointer allocate(size_type size, const_void_pointer = 0) {
+        enum {
+            m = detail::max_size<Alignment,
+                alignment_of<value_type>::value>::value
+        };
+        if (size == 0) {
+            return 0;
+        }
+        void* p = boost::alignment::aligned_alloc(m, sizeof(T) * size);
+        if (!p) {
+            detail::throw_exception(std::bad_alloc());
+        }
+        return static_cast<T*>(p);
+    }
+
+    void deallocate(pointer ptr, size_type) {
+        boost::alignment::aligned_free(ptr);
+    }
+
+    BOOST_CONSTEXPR size_type max_size() const BOOST_NOEXCEPT {
+        return detail::max_objects<T>::value;
+    }
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+    template<class U, class... Args>
+    void construct(U* ptr, Args&&... args) {
+        ::new((void*)ptr) U(std::forward<Args>(args)...);
+    }
+#else
+    template<class U, class V>
+    void construct(U* ptr, V&& value) {
+        ::new((void*)ptr) U(std::forward<V>(value));
+    }
+#endif
+#else
+    template<class U, class V>
+    void construct(U* ptr, const V& value) {
+        ::new((void*)ptr) U(value);
+    }
+
+    template<class U, class V>
+    void construct(U* ptr, V& value) {
+        ::new((void*)ptr) U(value);
+    }
+#endif
+
+    template<class U>
+    void construct(U* ptr) {
+        ::new((void*)ptr) U();
+    }
+
+    template<class U>
+    void destroy(U* ptr) {
+        (void)ptr;
+        ptr->~U();
+    }
+};
+
+template<class T, class U, std::size_t Alignment>
+inline bool
+operator==(const aligned_allocator<T, Alignment>&,
+    const aligned_allocator<U, Alignment>&) BOOST_NOEXCEPT
+{
+    return true;
+}
+
+template<class T, class U, std::size_t Alignment>
+inline bool
+operator!=(const aligned_allocator<T, Alignment>&,
+    const aligned_allocator<U, Alignment>&) BOOST_NOEXCEPT
+{
+    return false;
+}
+
+} /* alignment */
+} /* boost */
+
+#endif