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Editing: slist_hook.hpp

/////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Olaf Krzikalla 2004-2006.
// (C) Copyright Ion Gaztanaga  2006-2013
//
// 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_SLIST_HOOK_HPP
#define BOOST_INTRUSIVE_SLIST_HOOK_HPP

#include <boost/intrusive/detail/config_begin.hpp>
#include <boost/intrusive/intrusive_fwd.hpp>

#include <boost/intrusive/detail/slist_node.hpp>
#include <boost/intrusive/circular_slist_algorithms.hpp>
#include <boost/intrusive/link_mode.hpp>
#include <boost/intrusive/options.hpp>
#include <boost/intrusive/detail/generic_hook.hpp>

#if defined(BOOST_HAS_PRAGMA_ONCE)
#  pragma once
#endif

namespace boost {
namespace intrusive {

//! Helper metafunction to define a \c slist_base_hook that yields to the same
//! type when the same options (either explicitly or implicitly) are used.
#if defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED) || defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
template<class ...Options>
#else
template<class O1 = void, class O2 = void, class O3 = void>
#endif
struct make_slist_base_hook
{
 /// @cond
 typedef typename pack_options
 < hook_defaults,
 #if !defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
 O1, O2, O3
 #else
 Options...
 #endif
 >::type packed_options;

typedef generic_hook
 < CircularSListAlgorithms
 , slist_node_traits<typename packed_options::void_pointer>
 , typename packed_options::tag
 , packed_options::link_mode
 , SlistBaseHookId
 > implementation_defined;
 /// @endcond
 typedef implementation_defined type;
};

//! Derive a class from slist_base_hook in order to store objects in
//! in an list. slist_base_hook holds the data necessary to maintain the
//! list and provides an appropriate value_traits class for list.
//!
//! The hook admits the following options: \c tag<>, \c void_pointer<> and
//! \c link_mode<>.
//!
//! \c tag<> defines a tag to identify the node.
//! The same tag value can be used in different classes, but if a class is
//! derived from more than one \c list_base_hook, then each \c list_base_hook needs its
//! unique tag.
//!
//! \c link_mode<> will specify the linking mode of the hook (\c normal_link,
//! \c auto_unlink or \c safe_link).
//!
//! \c void_pointer<> is the pointer type that will be used internally in the hook
//! and the container configured to use this hook.
#if defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED) || defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
template<class ...Options>
#else
template<class O1, class O2, class O3>
#endif
class slist_base_hook
 : public make_slist_base_hook<
 #if !defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
 O1, O2, O3
 #else
 Options...
 #endif
 >::type
{
 #if defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED)
 public:
 //! Effects: If link_mode is \c auto_unlink or \c safe_link
 //! initializes the node to an unlinked state.
 //!
 //! Throws: Nothing.
 slist_base_hook();

//! Effects: If link_mode is \c auto_unlink or \c safe_link
 //! initializes the node to an unlinked state. The argument is ignored.
 //!
 //! Throws: Nothing.
 //!
 //! Rationale: Providing a copy-constructor
 //! makes classes using the hook STL-compliant without forcing the
 //! user to do some additional work. \c swap can be used to emulate
 //! move-semantics.
 slist_base_hook(const slist_base_hook& );

//! Effects: Empty function. The argument is ignored.
 //!
 //! Throws: Nothing.
 //!
 //! Rationale: Providing an assignment operator
 //! makes classes using the hook STL-compliant without forcing the
 //! user to do some additional work. \c swap can be used to emulate
 //! move-semantics.
 slist_base_hook& operator=(const slist_base_hook& );

//! Effects: If link_mode is \c normal_link, the destructor does
 //! nothing (ie. no code is generated). If link_mode is \c safe_link and the
 //! object is stored in an slist an assertion is raised. If link_mode is
 //! \c auto_unlink and \c is_linked() is true, the node is unlinked.
 //!
 //! Throws: Nothing.
 ~slist_base_hook();

//! Effects: Swapping two nodes swaps the position of the elements
 //! related to those nodes in one or two containers. That is, if the node
 //! this is part of the element e1, the node x is part of the element e2
 //! and both elements are included in the containers s1 and s2, then after
 //! the swap-operation e1 is in s2 at the position of e2 and e2 is in s1
 //! at the position of e1. If one element is not in a container, then
 //! after the swap-operation the other element is not in a container.
 //! Iterators to e1 and e2 related to those nodes are invalidated.
 //!
 //! Complexity: Constant
 //!
 //! Throws: Nothing.
 void swap_nodes(slist_base_hook &other);

//! Effects: Removes the node if it's inserted in a container.
 //! This function is only allowed if link_mode is \c auto_unlink.
 //!
 //! Throws: Nothing.
 void unlink();
 #endif
};

//! Helper metafunction to define a \c slist_member_hook that yields to the same
//! type when the same options (either explicitly or implicitly) are used.
#if defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED) || defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
template<class ...Options>
#else
template<class O1 = void, class O2 = void, class O3 = void>
#endif
struct make_slist_member_hook
{
 /// @cond
 typedef typename pack_options
 < hook_defaults,
 #if !defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
 O1, O2, O3
 #else
 Options...
 #endif
 >::type packed_options;

typedef generic_hook
 < CircularSListAlgorithms
 , slist_node_traits<typename packed_options::void_pointer>
 , member_tag
 , packed_options::link_mode
 , NoBaseHookId
 > implementation_defined;
 /// @endcond
 typedef implementation_defined type;
};

//! Put a public data member slist_member_hook in order to store objects of this class in
//! an list. slist_member_hook holds the data necessary for maintaining the list and
//! provides an appropriate value_traits class for list.
//!
//! The hook admits the following options: \c void_pointer<> and
//! \c link_mode<>.
//!
//! \c link_mode<> will specify the linking mode of the hook (\c normal_link,
//! \c auto_unlink or \c safe_link).
//!
//! \c void_pointer<> is the pointer type that will be used internally in the hook
//! and the container configured to use this hook.
#if defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED) || defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
template<class ...Options>
#else
template<class O1, class O2, class O3>
#endif
class slist_member_hook
 : public make_slist_member_hook<
 #if !defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
 O1, O2, O3
 #else
 Options...
 #endif
 >::type
{
 #if defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED)
 public:
 //! Effects: If link_mode is \c auto_unlink or \c safe_link
 //! initializes the node to an unlinked state.
 //!
 //! Throws: Nothing.
 slist_member_hook();

//! Precondition: link_mode must be \c safe_link or \c auto_unlink.
 //!
 //! Returns: true, if the node belongs to a container, false
 //! otherwise. This function can be used to test whether \c slist::iterator_to
 //! will return a valid iterator.
 //!
 //! Note: If this member is called when the value is inserted in a
 //! slist with the option linear<true>, this function will return "false"
 //! for the last element, as it is not linked to anything (the next element is null),
 //! so use with care.
 //! 
 //! Complexity: Constant
 bool is_linked() const;

} //namespace intrusive
} //namespace boost

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

#endif //BOOST_INTRUSIVE_SLIST_HOOK_HPP

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