155 lines
4.2 KiB
C++
155 lines
4.2 KiB
C++
/*
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* Copyright (C) 2005-2008 Patrick Ohly
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*/
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#ifndef INCL_EVOLUTION_SMART_POINTER
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# define INCL_EVOLUTION_SMART_POINTER
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#include "eds_abi_wrapper.h"
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#include <stdlib.h>
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#include <stdexcept>
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#include <string>
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#include <memory>
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using namespace std;
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#include <boost/scoped_array.hpp>
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#include <boost/shared_ptr.hpp>
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template<class T> class EvolutionUnrefFree {
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public:
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static void unref(T *pointer) { free(pointer); }
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};
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class EvolutionUnref {
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public:
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/**
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* C character string - beware, Funambol C++ client library strings must
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* be returned with delete [], use boost::scoped_array
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*/
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static void unref(char *pointer) { free(pointer); }
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#ifdef HAVE_EDS
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static void unref(GObject *pointer) { g_object_unref(pointer); }
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/** free a list of GObject and the objects */
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static void unref(GList *pointer) {
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if (pointer) {
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GList *next = pointer;
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do {
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g_object_unref(G_OBJECT(next->data));
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next = next->next;
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} while (next);
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g_list_free(pointer);
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}
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}
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#ifdef ENABLE_EBOOK
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static void unref(EBookQuery *pointer) { e_book_query_unref(pointer); }
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#endif
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#ifdef ENABLE_ECAL
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static void unref(icalcomponent *pointer) { icalcomponent_free(pointer); }
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static void unref(icaltimezone *pointer) { icaltimezone_free(pointer, 1); }
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#endif
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#endif
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};
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/**
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* a smart pointer implementation for objects for which
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* a unref() function exists;
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* trying to store a NULL pointer raises an exception,
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* unreferencing valid objects is done automatically
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*/
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template<class T, class base = T, class R = EvolutionUnref > class eptr {
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protected:
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T *m_pointer;
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public:
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/**
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* create a smart pointer that owns the given object;
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* passing a NULL pointer and a name for the object raises an error
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*/
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eptr(T *pointer = NULL, const char *objectName = NULL) :
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m_pointer( pointer )
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{
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if (!pointer && objectName ) {
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throw std::runtime_error(std::string("Error allocating ") + objectName);
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}
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};
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~eptr()
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{
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set( NULL );
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}
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/** assignment and copy construction transfer ownership to the copy */
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eptr(eptr &other) {
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m_pointer = other.m_pointer;
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other.m_pointer = NULL;
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}
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eptr & operator = (eptr &other) {
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m_pointer = other.m_pointer;
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other.m_pointer = NULL;
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return *this;
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}
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/**
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* store another object in this pointer, replacing any which was
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* referenced there before;
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* passing a NULL pointer and a name for the object raises an error
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*/
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void set( T *pointer, const char *objectName = NULL )
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{
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if (m_pointer) {
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R::unref((base *)m_pointer);
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}
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if (!pointer && objectName) {
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throw std::runtime_error(std::string("Error allocating ") + objectName);
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}
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m_pointer = pointer;
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}
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/**
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* transfer ownership over the pointer to caller and stop tracking it:
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* pointer tracked by smart pointer is set to NULL and the original
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* pointer is returned
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*/
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T *release() { T *res = m_pointer; m_pointer = NULL; return res; }
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eptr<T, base, R> &operator = ( T *pointer ) { set( pointer ); return *this; }
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T *get() { return m_pointer; }
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T *operator-> () { return m_pointer; }
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T &operator* () { return *m_pointer; }
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operator T * () { return m_pointer; }
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operator void * () { return (void *)m_pointer; }
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operator bool () { return m_pointer != NULL; }
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};
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template <class T> class CxxUnref {
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public:
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static void unref(T *pointer) { delete pointer; }
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};
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/** eptr for normal C++ objects */
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template <class T> class cxxptr : public eptr<T, T, CxxUnref<T> > {
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public:
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cxxptr(T *pointer = NULL, const char *objectName = NULL) :
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eptr<T, T, CxxUnref<T> > (pointer, objectName)
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{
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};
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};
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template <class T> class ArrayUnref {
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public:
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static void unref(T *pointer) { delete [] pointer; }
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};
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/** eptr for array of objects or types */
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template <class T> class arrayptr : public eptr<T, T, ArrayUnref<T> > {
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public:
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arrayptr(T *pointer = NULL, const char *objectName = NULL) :
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eptr<T, T, ArrayUnref<T> > (pointer, objectName)
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{
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};
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};
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#endif
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