CairoPointer.hpp

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/* 
 * CairoPointer.hpp 
 *
 * This file is part of the Chemical Data Processing Toolkit
 *
 * Copyright (C) 2003 Thomas Seidel <thomas.seidel@univie.ac.at>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; see the file COPYING. If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
 
#ifndef CDPL_VIS_CAIROPOINTER_HPP
#define CDPL_VIS_CAIROPOINTER_HPP
 
#include "CDPL/Vis/APIPrefix.hpp"
 
 
typedef struct _cairo         cairo_t;
typedef struct _cairo_surface cairo_surface_t;
typedef struct _cairo_pattern cairo_pattern_t;
 
 
namespace CDPL
{
 
    namespace Vis
    {
 
        template <typename T>
        struct CairoPointerTraits;
 
        template <>
        struct CDPL_VIS_API CairoPointerTraits<cairo_t>
        {
 
            static cairo_t* reference(cairo_t* p) throw();
 
            static void destroy(cairo_t* p) throw();
        };
 
        template <>
        struct CDPL_VIS_API CairoPointerTraits<cairo_surface_t>
        {
 
            static cairo_surface_t* reference(cairo_surface_t* p) throw();
 
            static void destroy(cairo_surface_t* p) throw();
        };
 
        template <>
        struct CDPL_VIS_API CairoPointerTraits<cairo_pattern_t>
        {
 
            static cairo_pattern_t* reference(cairo_pattern_t* p) throw();
 
            static void destroy(cairo_pattern_t* p) throw();
        };
 
        template <typename T>
        class CairoPointer
        {
 
          public:
            explicit CairoPointer(T* ptr = 0) throw();
 
            CairoPointer(const CairoPointer& ptr) throw();
 
            ~CairoPointer();
 
            CairoPointer& operator=(const CairoPointer& ptr) throw();
 
            bool operator!() const throw();
 
            T& operator*() const throw();
 
            T* operator->() const throw();
 
            T* get() const throw();
 
            T* release() throw();
 
            void reset(T* ptr = 0) throw();
 
          private:
            T* pointer;
        };
    } // namespace Vis
} // namespace CDPL
 
 
// Implementation
 
template <typename T>
CDPL::Vis::CairoPointer<T>::CairoPointer(T* p) throw():
    pointer(p)
{}
 
template <typename T>
CDPL::Vis::CairoPointer<T>::CairoPointer(const CairoPointer& other) throw():
    pointer(CairoPointerTraits<T>::reference(other.pointer))
{}
 
template <typename T>
CDPL::Vis::CairoPointer<T>::~CairoPointer()
{
    CairoPointerTraits<T>::destroy(pointer);
}
 
template <typename T>
CDPL::Vis::CairoPointer<T>& CDPL::Vis::CairoPointer<T>::operator=(const CairoPointer& other) throw()
{
    if (this != &other) {
        CairoPointerTraits<T>::destroy(pointer);
        pointer = CairoPointerTraits<T>::reference(other.pointer);
    }
 
    return *this;
}
 
template <typename T>
bool CDPL::Vis::CairoPointer<T>::operator!() const throw()
{
    return !pointer;
}
 
template <typename T>
T& CDPL::Vis::CairoPointer<T>::operator*() const throw()
{
    return *pointer;
}
 
template <typename T>
T* CDPL::Vis::CairoPointer<T>::operator->() const throw()
{
    return pointer;
}
 
template <typename T>
T* CDPL::Vis::CairoPointer<T>::get() const throw()
{
    return pointer;
}
 
template <typename T>
T* CDPL::Vis::CairoPointer<T>::release() throw()
{
    T* tmp  = pointer;
    pointer = 0;
    return tmp;
}
 
template <typename T>
void CDPL::Vis::CairoPointer<T>::reset(T* p) throw()
{
    if (p != pointer) {
        CairoPointerTraits<T>::destroy(pointer);
        pointer = p;
    }
}
 
#endif // CDPL_VIS_CAIROPOINTER_HPP