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88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef BEAST_INTRUSIVE_POINTERTRAITS_H_INCLUDED
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#define BEAST_INTRUSIVE_POINTERTRAITS_H_INCLUDED
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namespace beast {
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namespace intrusive {
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// an unspecialized PointerTraits is ill-defined
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template <typename P>
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struct PointerTraits;
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// specializations to remove cv-qualifiers
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template <typename P>
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struct PointerTraits <P const> : PointerTraits <P> { };
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template <typename P>
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struct PointerTraits <P volatile> : PointerTraits <P> { };
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template <typename P>
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struct PointerTraits <P const volatile> : PointerTraits <P> { };
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// specialization to remove a reference attribute
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template <typename P>
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struct PointerTraits <P&> : PointerTraits <P> { };
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// specialization for raw pointers
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template <typename T>
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struct PointerTraits <T*>
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{
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typedef T element_type;
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typedef T* pointer;
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typedef T& reference;
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typedef std::ptrdiff_t difference_type;
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template <class U>
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struct rebind_pointer
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{
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typedef U* type;
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};
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static pointer pointer_to (reference r)
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{
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return static_cast <pointer> (
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static_cast <void*> (
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const_cast <char*> (
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&reinterpret_cast <const char&> (
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r))));
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}
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template <class U>
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static pointer static_cast_from (U* u)
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{
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return static_cast <pointer> (u);
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}
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template <class U>
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static pointer const_cast_from (U* u)
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{
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return const_cast <pointer> (u);
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}
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template <class U>
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static pointer dynamic_cast_from (U* u)
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{
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return dynamic_cast <pointer> (u);
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}
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};
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}
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}
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#endif
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