reversible_ptr_container.hpp

C++的一个好库。。。现在很流行

         : c_( a )
        {}
        
        template< class PtrContainer >
        explicit reversible_ptr_container( std::auto_ptr<PtrContainer> clone )
          : c_( allocator_type() )                
        { 
            swap( *clone ); 
        }

    private:
        template< class I >
        void constructor_impl( I first, I last, std::input_iterator_tag ) // basic
        {
            while( first != last )
            {
                insert( end(), null_cloner_type::allocate_clone_from_iterator(first) );
                ++first;
            }
        }

        template< class I >
        void constructor_impl( I first, I last, std::forward_iterator_tag ) // strong
        {
            if( first == last )
                return;
            clone_back_insert( first, last );
        }


    public:
        // overhead: null-initilization of container pointer (very cheap compared to cloning)
        // overhead: 1 heap allocation (very cheap compared to cloning)
        template< class InputIterator >
        reversible_ptr_container( InputIterator first, 
                                  InputIterator last,
                                  const allocator_type& a = allocator_type() ) // basic, strong
        : c_( a )
        { 
            constructor_impl( first, last, 
#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
#else
                              BOOST_DEDUCED_TYPENAME
#endif                              
                              iterator_category<InputIterator>::type() );
        }

        template< class Compare >
        reversible_ptr_container( const Compare& comp,
                                  const allocator_type& a )
        : c_( comp, a ) {}

        template< class PtrContainer, class Compare >
        reversible_ptr_container( std::auto_ptr<PtrContainer> clone, 
                                  Compare comp )
        : c_( comp, allocator_type() )                
        { 
            swap( *clone ); 
        }

    public:        
        ~reversible_ptr_container()
        { 
            remove_all();
        }
        
        template< class PtrContainer >
        void operator=( std::auto_ptr<PtrContainer> clone )     
        {
            swap( *clone );
        }

    public:
        
        allocator_type get_allocator() const                   
        {
            return c_.get_allocator(); 
        }
 
    public: // container requirements
        iterator                   begin()            { return iterator( c_.begin() ); }
        const_iterator             begin() const      { return const_iterator( c_.begin() ); }
        iterator                   end()              { return iterator( c_.end() ); }
        const_iterator             end() const        { return const_iterator( c_.end() ); }
        reverse_iterator           rbegin()           { return reverse_iterator( c_.rbegin() ); } 
        const_reverse_iterator     rbegin() const     { return const_reverse_iterator( c_.rbegin() ); } 
        reverse_iterator           rend()             { return reverse_iterator( c_.rend() ); } 
        const_reverse_iterator     rend() const       { return const_reverse_iterator( c_.rend() ); } 
 
        void swap( reversible_ptr_container& r ) // notrow
        { 
            c_.swap( r.c_ );
        }
          
        size_type size() const // nothrow
        {
            return c_.size();
        }

        size_type max_size() const // nothrow
        {
            return c_.max_size(); 
        }
        
        bool empty() const // nothrow
        {
            return c_.empty();
        }

    public: // optional container requirements

        bool operator==( const reversible_ptr_container& r ) const // nothrow
        { 
            if( size() != r.size() )
                return false;
            else
                return std::equal( begin(), end(), r.begin() );
        }

        bool operator!=( const reversible_ptr_container& r ) const // nothrow
        {
            return !(*this == r);
        }
        
        bool operator<( const reversible_ptr_container& r ) const // nothrow 
        {
             return std::lexicographical_compare( begin(), end(), r.begin(), r.end() );
        }

        bool operator<=( const reversible_ptr_container& r ) const // nothrow 
        {
            return !(r < *this);
        }

        bool operator>( const reversible_ptr_container& r ) const // nothrow 
        {
            return r < *this;
        }

        bool operator>=( const reversible_ptr_container& r ) const // nothrow 
        {
            return !(*this < r);
        }

    public: // modifiers

        iterator insert( iterator before, Ty_* x )
        {
            enforce_null_policy( x, "Null pointer in 'insert()'" );

            auto_type ptr( x );                            // nothrow
            iterator res( c_.insert( before.base(), x ) ); // strong, commit
            ptr.release();                                 // nothrow
            return res;
        }

        iterator erase( iterator x ) // nothrow 
        { 
            BOOST_ASSERT( !empty() );
            BOOST_ASSERT( x != end() );
            
            remove( x ); 
            return iterator( c_.erase( x.base() ) );
        }
        
        iterator erase( iterator first, iterator last ) // nothrow 
        {
            BOOST_ASSERT( !empty() );
            remove( first, last ); 
            return iterator( c_.erase( first.base(), 
                                       last.base() ) );
        }

        template< class Range >
        iterator erase( const Range& r )
        {
            return erase( adl_begin(r), adl_end(r) );
        }
        
        void clear()                               
        { 
            remove_all(); 
            c_.clear();
        }
        
    public: // access interface
        
        auto_type release( iterator where )
        { 
            BOOST_ASSERT( where != end() );
            if( empty() )
                throw bad_ptr_container_operation( "'release()' on empty container" ); 
            
            auto_type ptr( Config::get_pointer( where ) );  // nothrow
            c_.erase( where.base() );                       // nothrow
            return boost::ptr_container_detail::move( ptr ); 
        }

        auto_type replace( iterator where, Ty_* x ) // strong  
        { 
            BOOST_ASSERT( where != end() );

            enforce_null_policy( x, "Null pointer in 'replace()'" );
            
            auto_type ptr( x );
            
            if( empty() )
                throw bad_ptr_container_operation( "'replace()' on empty container" );

            auto_type old( Config::get_pointer( where ) );  // nothrow
            
//#if defined( __GNUC__ ) || defined( __MWERKS__ ) || defined( __COMO__ )
            const_cast<void*&>(*where.base()) = ptr.release();                
//#else
//            *where.base() = ptr.release(); // nothrow, commit
//#endif            
            return boost::ptr_container_detail::move( old );
        }

        auto_type replace( size_type idx, Ty_* x ) // strong
        {
            enforce_null_policy( x, "Null pointer in 'replace()'" );
            
            auto_type ptr( x ); 
            
            if( idx >= size() ) 
                throw bad_index( "'replace()' out of bounds" );
            
            auto_type old( static_cast<Ty_*>( c_[idx] ) ); // nothrow
            c_[idx] = ptr.release();                       // nothrow, commit
            return boost::ptr_container_detail::move( old );
        } 
        
    }; // 'reversible_ptr_container'


#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))    
#define BOOST_PTR_CONTAINER_DEFINE_RELEASE( base_type ) \
    typename base_type::auto_type                   \
    release( typename base_type::iterator i )       \
    {                                               \
        return boost::ptr_container_detail::move(base_type::release(i)); \
    }                                               
#else
#define BOOST_PTR_CONTAINER_DEFINE_RELEASE( base_type ) \
    using base_type::release;
#endif
    
    //
    // two-phase lookup of template functions 
    // is buggy on most compilers, so we use a macro instead
    //
#define BOOST_PTR_CONTAINER_DEFINE_RELEASE_AND_CLONE( PC, base_type, this_type ) \
                                                    \
    PC( std::auto_ptr<this_type> r )                \
    : base_type ( r ) { }                           \
                                                    \
    void operator=( std::auto_ptr<this_type> r )    \
    {                                               \
        base_type::operator=( r );                  \
    }                                               \
                                                    \
    std::auto_ptr<this_type> release()              \
    {                                               \
      std::auto_ptr<this_type> ptr( new this_type );\
      this->swap( *ptr );                           \
      return ptr;                                   \
    }                                               \
    BOOST_PTR_CONTAINER_DEFINE_RELEASE( base_type ) \
                                                    \
    std::auto_ptr<this_type> clone() const          \
    {                                               \
       return std::auto_ptr<this_type>( new this_type( this->begin(), this->end() ) ); \
    }

#define BOOST_PTR_CONTAINER_DEFINE_CONSTRUCTORS( PC, base_type )                       \
    typedef BOOST_DEDUCED_TYPENAME base_type::iterator        iterator;                \
    typedef BOOST_DEDUCED_TYPENAME base_type::size_type       size_type;               \
    typedef BOOST_DEDUCED_TYPENAME base_type::const_reference const_reference;         \
    typedef BOOST_DEDUCED_TYPENAME base_type::allocator_type  allocator_type;          \
    PC( const allocator_type& a = allocator_type() ) : base_type(a) {}                 \
    template< class InputIterator >                                                    \
    PC( InputIterator first, InputIterator last,                                       \
    const allocator_type& a = allocator_type() ) : base_type( first, last, a ) {}      
    

                 
#define BOOST_PTR_CONTAINER_DEFINE_NON_INHERITED_MEMBERS( PC, base_type, this_type )           \
   BOOST_PTR_CONTAINER_DEFINE_CONSTRUCTORS( PC, base_type )                                    \
   BOOST_PTR_CONTAINER_DEFINE_RELEASE_AND_CLONE( PC, base_type, this_type )
    
    } // namespace 'ptr_container_detail'

} // namespace 'boost'  

#endif