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319 lines
14 KiB
C++
319 lines
14 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Pablo Halpern 2009. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2011-2014. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/intrusive for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_INTRUSIVE_POINTER_TRAITS_HPP
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#define BOOST_INTRUSIVE_POINTER_TRAITS_HPP
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#include <boost/intrusive/detail/config_begin.hpp>
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#include <boost/intrusive/detail/workaround.hpp>
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#include <boost/intrusive/pointer_rebind.hpp>
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#include <boost/intrusive/detail/pointer_element.hpp>
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#include <boost/intrusive/detail/mpl.hpp>
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#include <cstddef>
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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# pragma once
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#endif
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namespace boost {
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namespace intrusive {
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namespace detail {
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#if !defined(BOOST_MSVC) || (BOOST_MSVC > 1310)
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BOOST_INTRUSIVE_HAS_STATIC_MEMBER_FUNC_SIGNATURE(has_member_function_callable_with_pointer_to, pointer_to)
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BOOST_INTRUSIVE_HAS_STATIC_MEMBER_FUNC_SIGNATURE(has_member_function_callable_with_dynamic_cast_from, dynamic_cast_from)
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BOOST_INTRUSIVE_HAS_STATIC_MEMBER_FUNC_SIGNATURE(has_member_function_callable_with_static_cast_from, static_cast_from)
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BOOST_INTRUSIVE_HAS_STATIC_MEMBER_FUNC_SIGNATURE(has_member_function_callable_with_const_cast_from, const_cast_from)
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#else
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BOOST_INTRUSIVE_HAS_MEMBER_FUNC_CALLED_IGNORE_SIGNATURE(has_member_function_callable_with_pointer_to, pointer_to)
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BOOST_INTRUSIVE_HAS_MEMBER_FUNC_CALLED_IGNORE_SIGNATURE(has_member_function_callable_with_dynamic_cast_from, dynamic_cast_from)
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BOOST_INTRUSIVE_HAS_MEMBER_FUNC_CALLED_IGNORE_SIGNATURE(has_member_function_callable_with_static_cast_from, static_cast_from)
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BOOST_INTRUSIVE_HAS_MEMBER_FUNC_CALLED_IGNORE_SIGNATURE(has_member_function_callable_with_const_cast_from, const_cast_from)
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#endif
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BOOST_INTRUSIVE_INSTANTIATE_EVAL_DEFAULT_TYPE_TMPLT(element_type)
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BOOST_INTRUSIVE_INSTANTIATE_DEFAULT_TYPE_TMPLT(difference_type)
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BOOST_INTRUSIVE_INSTANTIATE_DEFAULT_TYPE_TMPLT(reference)
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BOOST_INTRUSIVE_INSTANTIATE_DEFAULT_TYPE_TMPLT(value_traits_ptr)
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} //namespace detail {
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//! pointer_traits is the implementation of C++11 std::pointer_traits class with some
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//! extensions like castings.
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//!
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//! pointer_traits supplies a uniform interface to certain attributes of pointer-like types.
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//!
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//! <b>Note</b>: When defining a custom family of pointers or references to be used with BI
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//! library, make sure the public static conversion functions accessed through
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//! the `pointer_traits` interface (`*_cast_from` and `pointer_to`) can
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//! properly convert between const and nonconst referred member types
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//! <b>without the use of implicit constructor calls</b>. It is suggested these
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//! conversions be implemented as function templates, where the template
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//! argument is the type of the object being converted from.
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template <typename Ptr>
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struct pointer_traits
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{
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#ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
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//!The pointer type
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//!queried by this pointer_traits instantiation
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typedef Ptr pointer;
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//!Ptr::element_type if such a type exists; otherwise, T if Ptr is a class
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//!template instantiation of the form SomePointer<T, Args>, where Args is zero or
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//!more type arguments ; otherwise , the specialization is ill-formed.
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typedef unspecified_type element_type;
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//!Ptr::difference_type if such a type exists; otherwise,
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//!std::ptrdiff_t.
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typedef unspecified_type difference_type;
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//!Ptr::rebind<U> if such a type exists; otherwise, SomePointer<U, Args> if Ptr is
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//!a class template instantiation of the form SomePointer<T, Args>, where Args is zero or
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//!more type arguments ; otherwise, the instantiation of rebind is ill-formed.
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//!
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//!For portable code for C++03 and C++11, <pre>typename rebind_pointer<U>::type</pre>
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//!shall be used instead of rebind<U> to obtain a pointer to U.
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template <class U> using rebind = unspecified;
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//!Ptr::reference if such a type exists (non-standard extension); otherwise, element_type &
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//!
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typedef unspecified_type reference;
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#else
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typedef Ptr pointer;
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//
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typedef BOOST_INTRUSIVE_OBTAIN_TYPE_WITH_EVAL_DEFAULT
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( boost::intrusive::detail::, Ptr, element_type
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, boost::intrusive::detail::first_param<Ptr>) element_type;
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//
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typedef BOOST_INTRUSIVE_OBTAIN_TYPE_WITH_DEFAULT
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(boost::intrusive::detail::, Ptr, difference_type, std::ptrdiff_t) difference_type;
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typedef BOOST_INTRUSIVE_OBTAIN_TYPE_WITH_DEFAULT
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(boost::intrusive::detail::, Ptr, reference, typename boost::intrusive::detail::unvoid_ref<element_type>::type) reference;
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//
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template <class U> struct rebind_pointer
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{
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typedef typename boost::intrusive::pointer_rebind<Ptr, U>::type type;
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};
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#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
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template <class U> using rebind = typename boost::intrusive::pointer_rebind<Ptr, U>::type;
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#endif
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#endif //#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
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//! <b>Remark</b>: If element_type is (possibly cv-qualified) void, r type is unspecified; otherwise,
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//! it is element_type &.
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//!
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//! <b>Returns</b>: A dereferenceable pointer to r obtained by calling Ptr::pointer_to(reference).
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//! Non-standard extension: If such function does not exist, returns pointer(addressof(r));
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//!
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//! <b>Note</b>: For non-conforming compilers only the existence of a member function called
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//! <code>pointer_to</code> is checked.
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static pointer pointer_to(reference r)
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{
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//Non-standard extension, it does not require Ptr::pointer_to. If not present
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//tries to converts &r to pointer.
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const bool value = boost::intrusive::detail::
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has_member_function_callable_with_pointer_to
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<Ptr, Ptr (*)(reference)>::value;
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boost::intrusive::detail::bool_<value> flag;
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return pointer_traits::priv_pointer_to(flag, r);
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}
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//! <b>Remark</b>: Non-standard extension.
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//!
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//! <b>Returns</b>: A dereferenceable pointer to r obtained by calling the static template function
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//! Ptr::static_cast_from(UPpr/const UPpr &).
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//! If such function does not exist, returns pointer_to(static_cast<element_type&>(*uptr))
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//!
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//! <b>Note</b>: For non-conforming compilers only the existence of a member function called
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//! <code>static_cast_from</code> is checked.
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template<class UPtr>
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static pointer static_cast_from(const UPtr &uptr)
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{
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typedef const UPtr &RefArg;
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const bool value = boost::intrusive::detail::
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has_member_function_callable_with_static_cast_from
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<pointer, pointer(*)(RefArg)>::value
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|| boost::intrusive::detail::
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has_member_function_callable_with_static_cast_from
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<pointer, pointer(*)(UPtr)>::value;
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return pointer_traits::priv_static_cast_from(boost::intrusive::detail::bool_<value>(), uptr);
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}
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//! <b>Remark</b>: Non-standard extension.
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//!
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//! <b>Returns</b>: A dereferenceable pointer to r obtained by calling the static template function
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//! Ptr::const_cast_from<UPtr>(UPpr/const UPpr &).
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//! If such function does not exist, returns pointer_to(const_cast<element_type&>(*uptr))
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//!
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//! <b>Note</b>: For non-conforming compilers only the existence of a member function called
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//! <code>const_cast_from</code> is checked.
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template<class UPtr>
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static pointer const_cast_from(const UPtr &uptr)
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{
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typedef const UPtr &RefArg;
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const bool value = boost::intrusive::detail::
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has_member_function_callable_with_const_cast_from
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<pointer, pointer(*)(RefArg)>::value
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|| boost::intrusive::detail::
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has_member_function_callable_with_const_cast_from
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<pointer, pointer(*)(UPtr)>::value;
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return pointer_traits::priv_const_cast_from(boost::intrusive::detail::bool_<value>(), uptr);
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}
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//! <b>Remark</b>: Non-standard extension.
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//!
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//! <b>Returns</b>: A dereferenceable pointer to r obtained by calling the static template function
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//! Ptr::dynamic_cast_from<UPtr>(UPpr/const UPpr &).
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//! If such function does not exist, returns pointer_to(*dynamic_cast<element_type*>(&*uptr))
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//!
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//! <b>Note</b>: For non-conforming compilers only the existence of a member function called
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//! <code>dynamic_cast_from</code> is checked.
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template<class UPtr>
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static pointer dynamic_cast_from(const UPtr &uptr)
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{
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typedef const UPtr &RefArg;
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const bool value = boost::intrusive::detail::
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has_member_function_callable_with_dynamic_cast_from
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<pointer, pointer(*)(RefArg)>::value
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|| boost::intrusive::detail::
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has_member_function_callable_with_dynamic_cast_from
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<pointer, pointer(*)(UPtr)>::value;
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return pointer_traits::priv_dynamic_cast_from(boost::intrusive::detail::bool_<value>(), uptr);
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}
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///@cond
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private:
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//priv_to_raw_pointer
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template <class T>
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static T* to_raw_pointer(T* p)
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{ return p; }
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template <class Pointer>
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static typename pointer_traits<Pointer>::element_type*
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to_raw_pointer(const Pointer &p)
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{ return pointer_traits::to_raw_pointer(p.operator->()); }
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//priv_pointer_to
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static pointer priv_pointer_to(boost::intrusive::detail::true_, reference r)
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{ return Ptr::pointer_to(r); }
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static pointer priv_pointer_to(boost::intrusive::detail::false_, reference r)
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{ return pointer(boost::intrusive::detail::addressof(r)); }
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//priv_static_cast_from
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template<class UPtr>
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static pointer priv_static_cast_from(boost::intrusive::detail::true_, const UPtr &uptr)
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{ return Ptr::static_cast_from(uptr); }
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template<class UPtr>
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static pointer priv_static_cast_from(boost::intrusive::detail::false_, const UPtr &uptr)
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{ return uptr ? pointer_to(*static_cast<element_type*>(to_raw_pointer(uptr))) : pointer(); }
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//priv_const_cast_from
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template<class UPtr>
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static pointer priv_const_cast_from(boost::intrusive::detail::true_, const UPtr &uptr)
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{ return Ptr::const_cast_from(uptr); }
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template<class UPtr>
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static pointer priv_const_cast_from(boost::intrusive::detail::false_, const UPtr &uptr)
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{ return uptr ? pointer_to(const_cast<element_type&>(*uptr)) : pointer(); }
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//priv_dynamic_cast_from
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template<class UPtr>
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static pointer priv_dynamic_cast_from(boost::intrusive::detail::true_, const UPtr &uptr)
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{ return Ptr::dynamic_cast_from(uptr); }
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template<class UPtr>
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static pointer priv_dynamic_cast_from(boost::intrusive::detail::false_, const UPtr &uptr)
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{ return uptr ? pointer_to(dynamic_cast<element_type&>(*uptr)) : pointer(); }
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///@endcond
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};
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///@cond
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// Remove cv qualification from Ptr parameter to pointer_traits:
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template <typename Ptr>
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struct pointer_traits<const Ptr> : pointer_traits<Ptr> {};
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template <typename Ptr>
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struct pointer_traits<volatile Ptr> : pointer_traits<Ptr> { };
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template <typename Ptr>
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struct pointer_traits<const volatile Ptr> : pointer_traits<Ptr> { };
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// Remove reference from Ptr parameter to pointer_traits:
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template <typename Ptr>
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struct pointer_traits<Ptr&> : pointer_traits<Ptr> { };
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///@endcond
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//! Specialization of pointer_traits for raw pointers
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//!
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template <typename T>
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struct pointer_traits<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 std::ptrdiff_t difference_type;
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#ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
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typedef T & reference;
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//!typedef for <pre>U *</pre>
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//!
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//!For portable code for C++03 and C++11, <pre>typename rebind_pointer<U>::type</pre>
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//!shall be used instead of rebind<U> to obtain a pointer to U.
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template <class U> using rebind = U*;
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#else
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typedef typename boost::intrusive::detail::unvoid_ref<element_type>::type reference;
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#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
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template <class U> using rebind = U*;
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#endif
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#endif
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template <class U> struct rebind_pointer
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{ typedef U* type; };
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//! <b>Returns</b>: addressof(r)
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//!
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BOOST_INTRUSIVE_FORCEINLINE static pointer pointer_to(reference r)
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{ return boost::intrusive::detail::addressof(r); }
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//! <b>Returns</b>: static_cast<pointer>(uptr)
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//!
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template<class U>
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BOOST_INTRUSIVE_FORCEINLINE static pointer static_cast_from(U *uptr)
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{ return static_cast<pointer>(uptr); }
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//! <b>Returns</b>: const_cast<pointer>(uptr)
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//!
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template<class U>
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BOOST_INTRUSIVE_FORCEINLINE static pointer const_cast_from(U *uptr)
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{ return const_cast<pointer>(uptr); }
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//! <b>Returns</b>: dynamic_cast<pointer>(uptr)
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//!
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template<class U>
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BOOST_INTRUSIVE_FORCEINLINE static pointer dynamic_cast_from(U *uptr)
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{ return dynamic_cast<pointer>(uptr); }
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};
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} //namespace container {
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} //namespace boost {
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#include <boost/intrusive/detail/config_end.hpp>
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#endif // ! defined(BOOST_INTRUSIVE_POINTER_TRAITS_HPP)
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