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Editing: pointer_traits.hpp

//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Pablo Halpern 2009. 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)
//
//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2011-2014. 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)
//
// See http://www.boost.org/libs/intrusive for documentation.
//
//////////////////////////////////////////////////////////////////////////////

#ifndef BOOST_INTRUSIVE_POINTER_TRAITS_HPP
#define BOOST_INTRUSIVE_POINTER_TRAITS_HPP

#include <boost/intrusive/detail/config_begin.hpp>
#include <boost/intrusive/detail/workaround.hpp>
#include <boost/intrusive/pointer_rebind.hpp>
#include <boost/move/detail/pointer_element.hpp>
#include <boost/intrusive/detail/mpl.hpp>
#include <cstddef>

#if defined(BOOST_HAS_PRAGMA_ONCE)
#  pragma once
#endif

namespace boost {
namespace intrusive {
namespace detail {

#if !defined(BOOST_MSVC) || (BOOST_MSVC > 1310)
BOOST_INTRUSIVE_HAS_STATIC_MEMBER_FUNC_SIGNATURE(has_member_function_callable_with_pointer_to, pointer_to)
BOOST_INTRUSIVE_HAS_STATIC_MEMBER_FUNC_SIGNATURE(has_member_function_callable_with_dynamic_cast_from, dynamic_cast_from)
BOOST_INTRUSIVE_HAS_STATIC_MEMBER_FUNC_SIGNATURE(has_member_function_callable_with_static_cast_from, static_cast_from)
BOOST_INTRUSIVE_HAS_STATIC_MEMBER_FUNC_SIGNATURE(has_member_function_callable_with_const_cast_from, const_cast_from)
#else
BOOST_INTRUSIVE_HAS_MEMBER_FUNC_CALLED_IGNORE_SIGNATURE(has_member_function_callable_with_pointer_to, pointer_to)
BOOST_INTRUSIVE_HAS_MEMBER_FUNC_CALLED_IGNORE_SIGNATURE(has_member_function_callable_with_dynamic_cast_from, dynamic_cast_from)
BOOST_INTRUSIVE_HAS_MEMBER_FUNC_CALLED_IGNORE_SIGNATURE(has_member_function_callable_with_static_cast_from, static_cast_from)
BOOST_INTRUSIVE_HAS_MEMBER_FUNC_CALLED_IGNORE_SIGNATURE(has_member_function_callable_with_const_cast_from, const_cast_from)
#endif

BOOST_INTRUSIVE_INSTANTIATE_EVAL_DEFAULT_TYPE_TMPLT(element_type)
BOOST_INTRUSIVE_INSTANTIATE_DEFAULT_TYPE_TMPLT(difference_type)
BOOST_INTRUSIVE_INSTANTIATE_DEFAULT_TYPE_TMPLT(reference)
BOOST_INTRUSIVE_INSTANTIATE_DEFAULT_TYPE_TMPLT(value_traits_ptr)

}  //namespace detail {

//! pointer_traits is the implementation of C++11 std::pointer_traits class with some
//! extensions like castings.
//!
//! pointer_traits supplies a uniform interface to certain attributes of pointer-like types.
//!
//! Note: When defining a custom family of pointers or references to be used with BI
//! library, make sure the public static conversion functions accessed through
//! the `pointer_traits` interface (`*_cast_from` and `pointer_to`) can
//! properly convert between const and nonconst referred member types
//! without the use of implicit constructor calls. It is suggested these
//! conversions be implemented as function templates, where the template
//! argument is the type of the object being converted from.
template <typename Ptr>
struct pointer_traits
{
 #ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
 //!The pointer type
 //!queried by this pointer_traits instantiation
 typedef Ptr pointer;

//!Ptr::element_type if such a type exists; otherwise, T if Ptr is a class
 //!template instantiation of the form SomePointer<T, Args>, where Args is zero or
 //!more type arguments ; otherwise , the specialization is ill-formed.
 typedef unspecified_type element_type;

//!Ptr::difference_type if such a type exists; otherwise,
      //!std::ptrdiff_t.
      typedef unspecified_type difference_type;

//!Ptr::rebind if such a type exists; otherwise, SomePointer<U, Args> if Ptr is
 //!a class template instantiation of the form SomePointer<T, Args>, where Args is zero or
 //!more type arguments ; otherwise, the instantiation of rebind is ill-formed.
 //!
 //!For portable code for C++03 and C++11, <pre>typename rebind_pointer::type</pre>
 //!shall be used instead of rebind to obtain a pointer to U.
 template <class U> using rebind = unspecified;

//!Ptr::reference if such a type exists (non-standard extension); otherwise, element_type &
 //!
 typedef unspecified_type reference;
 #else
 typedef Ptr pointer;
 //
 typedef BOOST_INTRUSIVE_OBTAIN_TYPE_WITH_EVAL_DEFAULT
 ( boost::intrusive::detail::, Ptr, element_type
 , boost::movelib::detail::first_param<Ptr>) element_type;
 //
 typedef BOOST_INTRUSIVE_OBTAIN_TYPE_WITH_DEFAULT
 (boost::intrusive::detail::, Ptr, difference_type, std::ptrdiff_t) difference_type;

typedef BOOST_INTRUSIVE_OBTAIN_TYPE_WITH_DEFAULT
 (boost::intrusive::detail::, Ptr, reference, typename boost::intrusive::detail::unvoid_ref<element_type>::type) reference;
 //
 template <class U> struct rebind_pointer
 {
 typedef typename boost::intrusive::pointer_rebind<Ptr, U>::type type;
 };

#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
 template <class U> using rebind = typename boost::intrusive::pointer_rebind<Ptr, U>::type;
 #endif
 #endif //#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)

//! Remark: If element_type is (possibly cv-qualified) void, r type is unspecified; otherwise,
 //! it is element_type &.
 //!
 //! Returns: A dereferenceable pointer to r obtained by calling Ptr::pointer_to(reference).
 //! Non-standard extension: If such function does not exist, returns pointer(addressof(r));
 //!
 //! Note: For non-conforming compilers only the existence of a member function called
 //! <code>pointer_to</code> is checked.
 BOOST_INTRUSIVE_FORCEINLINE static pointer pointer_to(reference r)
 {
 //Non-standard extension, it does not require Ptr::pointer_to. If not present
 //tries to converts &r to pointer.
 const bool value = boost::intrusive::detail::
 has_member_function_callable_with_pointer_to
 <Ptr, Ptr (*)(reference)>::value;
 boost::intrusive::detail::bool_<value> flag;
 return pointer_traits::priv_pointer_to(flag, r);
 }

//! Remark: Non-standard extension.
 //!
 //! Returns: A dereferenceable pointer to r obtained by calling the static template function
 //! Ptr::static_cast_from(UPpr/const UPpr &).
 //! If such function does not exist, returns pointer_to(static_cast<element_type&>(*uptr))
 //!
 //! Note: For non-conforming compilers only the existence of a member function called
 //! <code>static_cast_from</code> is checked.
 template<class UPtr>
 BOOST_INTRUSIVE_FORCEINLINE static pointer static_cast_from(const UPtr &uptr)
 {
 typedef const UPtr &RefArg;
 const bool value = boost::intrusive::detail::
 has_member_function_callable_with_static_cast_from
 <pointer, pointer(*)(RefArg)>::value
 || boost::intrusive::detail::
 has_member_function_callable_with_static_cast_from
 <pointer, pointer(*)(UPtr)>::value;
 return pointer_traits::priv_static_cast_from(boost::intrusive::detail::bool_<value>(), uptr);
 }

//! Remark: Non-standard extension.
 //!
 //! Returns: A dereferenceable pointer to r obtained by calling the static template function
 //! Ptr::const_cast_from<UPtr>(UPpr/const UPpr &).
 //! If such function does not exist, returns pointer_to(const_cast<element_type&>(*uptr))
 //!
 //! Note: For non-conforming compilers only the existence of a member function called
 //! <code>const_cast_from</code> is checked.
 template<class UPtr>
 BOOST_INTRUSIVE_FORCEINLINE static pointer const_cast_from(const UPtr &uptr)
 {
 typedef const UPtr &RefArg;
 const bool value = boost::intrusive::detail::
 has_member_function_callable_with_const_cast_from
 <pointer, pointer(*)(RefArg)>::value
 || boost::intrusive::detail::
 has_member_function_callable_with_const_cast_from
 <pointer, pointer(*)(UPtr)>::value;
 return pointer_traits::priv_const_cast_from(boost::intrusive::detail::bool_<value>(), uptr);
 }

//! Remark: Non-standard extension.
 //!
 //! Returns: A dereferenceable pointer to r obtained by calling the static template function
 //! Ptr::dynamic_cast_from<UPtr>(UPpr/const UPpr &).
 //! If such function does not exist, returns pointer_to(*dynamic_cast<element_type*>(&*uptr))
 //!
 //! Note: For non-conforming compilers only the existence of a member function called
 //! <code>dynamic_cast_from</code> is checked.
 template<class UPtr>
 BOOST_INTRUSIVE_FORCEINLINE static pointer dynamic_cast_from(const UPtr &uptr)
 {
 typedef const UPtr &RefArg;
 const bool value = boost::intrusive::detail::
 has_member_function_callable_with_dynamic_cast_from
 <pointer, pointer(*)(RefArg)>::value
 || boost::intrusive::detail::
 has_member_function_callable_with_dynamic_cast_from
 <pointer, pointer(*)(UPtr)>::value;
 return pointer_traits::priv_dynamic_cast_from(boost::intrusive::detail::bool_<value>(), uptr);
 }

///@cond
 private:
 //priv_to_raw_pointer
 template <class T>
 BOOST_INTRUSIVE_FORCEINLINE static T* to_raw_pointer(T* p)
 { return p; }

template <class Pointer>
 BOOST_INTRUSIVE_FORCEINLINE static typename pointer_traits<Pointer>::element_type*
 to_raw_pointer(const Pointer &p)
 { return pointer_traits::to_raw_pointer(p.operator->()); }

//priv_pointer_to
   BOOST_INTRUSIVE_FORCEINLINE static pointer priv_pointer_to(boost::intrusive::detail::true_, reference r)
   { return Ptr::pointer_to(r); }

BOOST_INTRUSIVE_FORCEINLINE static pointer priv_pointer_to(boost::intrusive::detail::false_, reference r)
   { return pointer(boost::intrusive::detail::addressof(r)); }

//priv_static_cast_from
 template<class UPtr>
 BOOST_INTRUSIVE_FORCEINLINE static pointer priv_static_cast_from(boost::intrusive::detail::true_, const UPtr &uptr)
 { return Ptr::static_cast_from(uptr); }

template<class UPtr>
 BOOST_INTRUSIVE_FORCEINLINE static pointer priv_static_cast_from(boost::intrusive::detail::false_, const UPtr &uptr)
 { return uptr ? pointer_to(*static_cast<element_type*>(to_raw_pointer(uptr))) : pointer(); }

//priv_const_cast_from
 template<class UPtr>
 BOOST_INTRUSIVE_FORCEINLINE static pointer priv_const_cast_from(boost::intrusive::detail::true_, const UPtr &uptr)
 { return Ptr::const_cast_from(uptr); }

template<class UPtr>
 BOOST_INTRUSIVE_FORCEINLINE static pointer priv_const_cast_from(boost::intrusive::detail::false_, const UPtr &uptr)
 { return uptr ? pointer_to(const_cast<element_type&>(*uptr)) : pointer(); }

//priv_dynamic_cast_from
 template<class UPtr>
 BOOST_INTRUSIVE_FORCEINLINE static pointer priv_dynamic_cast_from(boost::intrusive::detail::true_, const UPtr &uptr)
 { return Ptr::dynamic_cast_from(uptr); }

template<class UPtr>
 BOOST_INTRUSIVE_FORCEINLINE static pointer priv_dynamic_cast_from(boost::intrusive::detail::false_, const UPtr &uptr)
 { return uptr ? pointer_to(dynamic_cast<element_type&>(*uptr)) : pointer(); }
 ///@endcond
};

///@cond

// Remove cv qualification from Ptr parameter to pointer_traits:
template <typename Ptr>
struct pointer_traits<const Ptr> : pointer_traits<Ptr> {};
template <typename Ptr>
struct pointer_traits<volatile Ptr> : pointer_traits<Ptr> { };
template <typename Ptr>
struct pointer_traits<const volatile Ptr> : pointer_traits<Ptr> { };
// Remove reference from Ptr parameter to pointer_traits:
template <typename Ptr>
struct pointer_traits<Ptr&> : pointer_traits<Ptr> { };

///@endcond

//! Specialization of pointer_traits for raw pointers
//!
template <typename T>
struct pointer_traits<T*>
{
 typedef T element_type;
 typedef T* pointer;
 typedef std::ptrdiff_t difference_type;

#ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
 typedef T & reference;
 //!typedef for <pre>U *</pre>
 //!
 //!For portable code for C++03 and C++11, <pre>typename rebind_pointer::type</pre>
 //!shall be used instead of rebind to obtain a pointer to U.
 template <class U> using rebind = U*;
 #else
 typedef typename boost::intrusive::detail::unvoid_ref<element_type>::type reference;
 #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
 template <class U> using rebind = U*;
 #endif
 #endif

template <class U> struct rebind_pointer
 { typedef U* type; };

//! Returns: addressof(r)
 //!
 BOOST_INTRUSIVE_FORCEINLINE static pointer pointer_to(reference r)
 { return boost::intrusive::detail::addressof(r); }

//! Returns: static_cast<pointer>(uptr)
 //!
 template<class U>
 BOOST_INTRUSIVE_FORCEINLINE static pointer static_cast_from(U *uptr)
 { return static_cast<pointer>(uptr); }

//! Returns: const_cast<pointer>(uptr)
 //!
 template<class U>
 BOOST_INTRUSIVE_FORCEINLINE static pointer const_cast_from(U *uptr)
 { return const_cast<pointer>(uptr); }

//! Returns: dynamic_cast<pointer>(uptr)
 //!
 template<class U>
 BOOST_INTRUSIVE_FORCEINLINE static pointer dynamic_cast_from(U *uptr)
 { return dynamic_cast<pointer>(uptr); }
};

}  //namespace container {
}  //namespace boost {

#include <boost/intrusive/detail/config_end.hpp>

#endif // ! defined(BOOST_INTRUSIVE_POINTER_TRAITS_HPP)

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