booster/smart_ptr/sp_counted_impl.h

#ifndef BOOSTER_SMART_PTR_DETAIL_SP_COUNTED_IMPL_HPP_INCLUDED
#define BOOSTER_SMART_PTR_DETAIL_SP_COUNTED_IMPL_HPP_INCLUDED

//
//  detail/sp_counted_impl.hpp
//
//  Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
//  Copyright 2004-2005 Peter Dimov
//
// 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)
//

#include <booster/config.h>

#include <booster/checked_delete.h>
#include <booster/smart_ptr/sp_counted_base.h>

#if defined(BOOSTER_SP_USE_STD_ALLOCATOR)
#include <memory>           // std::allocator
#endif

#include <cstddef>          // std::size_t

namespace booster
{

namespace detail
{

template<class X> class sp_counted_impl_p: public sp_counted_base
{
private:

    X * px_;

    sp_counted_impl_p( sp_counted_impl_p const & );
    sp_counted_impl_p & operator= ( sp_counted_impl_p const & );

    typedef sp_counted_impl_p<X> this_type;

public:

    explicit sp_counted_impl_p( X * px ): px_( px )
    {
    }

    virtual void dispose() // nothrow
    {
        booster::checked_delete( px_ );
    }

    virtual void * get_deleter( detail::sp_typeinfo const & )
    {
        return 0;
    }

    void * operator new( std::size_t )
    {
        return std::allocator<this_type>().allocate( 1, static_cast<this_type *>(0) );
    }

    void operator delete( void * p )
    {
        std::allocator<this_type>().deallocate( static_cast<this_type *>(p), 1 );
    }
};

//
// Borland's Codeguard trips up over the -Vx- option here:
//
#ifdef __CODEGUARD__
# pragma option push -Vx-
#endif

template<class P, class D> class sp_counted_impl_pd: public sp_counted_base
{
private:

    P ptr; // copy constructor must not throw
    D del; // copy constructor must not throw

    sp_counted_impl_pd( sp_counted_impl_pd const & );
    sp_counted_impl_pd & operator= ( sp_counted_impl_pd const & );

    typedef sp_counted_impl_pd<P, D> this_type;

public:

    // pre: d(p) must not throw

    sp_counted_impl_pd( P p, D d ): ptr(p), del(d)
    {
    }

    virtual void dispose() // nothrow
    {
        del( ptr );
    }

    virtual void * get_deleter( detail::sp_typeinfo const & ti )
    {
        return ti == BOOSTER_SP_TYPEID(D)? &reinterpret_cast<char&>( del ): 0;
    }

    void * operator new( std::size_t )
    {
        return std::allocator<this_type>().allocate( 1, static_cast<this_type *>(0) );
    }

    void operator delete( void * p )
    {
        std::allocator<this_type>().deallocate( static_cast<this_type *>(p), 1 );
    }

};

template<class P, class D, class A> class sp_counted_impl_pda: public sp_counted_base
{
private:

    P p_; // copy constructor must not throw
    D d_; // copy constructor must not throw
    A a_; // copy constructor must not throw

    sp_counted_impl_pda( sp_counted_impl_pda const & );
    sp_counted_impl_pda & operator= ( sp_counted_impl_pda const & );

    typedef sp_counted_impl_pda<P, D, A> this_type;

public:

    // pre: d( p ) must not throw

    sp_counted_impl_pda( P p, D d, A a ): p_( p ), d_( d ), a_( a )
    {
    }

    virtual void dispose() // nothrow
    {
        d_( p_ );
    }

    virtual void destroy() // nothrow
    {
        typedef typename A::template rebind< this_type >::other A2;

        A2 a2( a_ );

        this->~this_type();
        a2.deallocate( this, 1 );
    }

    virtual void * get_deleter( detail::sp_typeinfo const & ti )
    {
        return ti == BOOSTER_SP_TYPEID( D )? &reinterpret_cast<char&>( d_ ): 0;
    }
};

#ifdef __CODEGUARD__
# pragma option pop
#endif

} // namespace detail

} // namespace boost

#endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_IMPL_HPP_INCLUDED