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/****************************************************************************
* Copyright (C) 2009-2015 EPAM Systems
*
* This file is part of Indigo toolkit.
*
* This file may be distributed and/or modified under the terms of the
* GNU General Public License version 3 as published by the Free Software
* Foundation and appearing in the file LICENSE.GPL included in the
* packaging of this file.
*
* This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
* WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
***************************************************************************/
#ifndef __obj_h__
#define __obj_h__
#include "base_cpp/exception.h"
namespace indigo {
DECL_EXCEPTION(ObjError);
// Reusable storage for object
template <typename T> class Obj
{
public:
Obj () : _initialized(false)
{
}
~Obj ()
{
free();
}
T * get () const
{
if (!_initialized)
return 0;
return _ptr();
}
T * operator -> () const
{
if (!_initialized)
throw Error("no object");
return _ptr();
}
T & ref () const
{
if (!_initialized)
throw Error("no object");
return *_ptr();
}
T & create ()
{
if (_initialized)
throw Error("create(): already have object");
new (_storage) T();
_initialized = true;
return *_ptr();
}
template<typename A> T & create (A &a)
{
if (_initialized)
throw Error("create(): already have object");
new (_storage) T(a);
_initialized = true;
return *_ptr();
}
template<typename A> T & recreate (A &a)
{
free();
return create(a);
}
template<typename A> T & create (const A &a)
{
if (_initialized)
throw Error("create(): already have object");
new (_storage) T(a);
_initialized = true;
return *_ptr();
}
template<typename A, typename B> T & create (A &a, B &b)
{
if (_initialized)
throw Error("create(): already have object");
new (_storage) T(a, b);
_initialized = true;
return *_ptr();
}
template<typename A, typename B> T & create (A &a, B *b)
{
if (_initialized)
throw Error("create(): already have object");
new (_storage) T(a, b);
_initialized = true;
return *_ptr();
}
template<typename A, typename B, typename C> T & create (A &a, B &b, C *c)
{
if (_initialized)
throw Error("create(): already have object");
new (_storage) T(a, b, c);
_initialized = true;
return *_ptr();
}
template<typename A, typename B, typename C> T & create (A &a, B &b, C &c)
{
if (_initialized)
throw Error("create(): already have object");
new (_storage) T(a, b, c);
_initialized = true;
return *_ptr();
}
template<typename A, typename B, typename C> T & create (A &a, B *b, C &c)
{
if (_initialized)
throw Error("create(): already have object");
new (_storage) T(a, b, c);
_initialized = true;
return *_ptr();
}
void free ()
{
if (_initialized)
{
_ptr()->~T();
_initialized = false;
}
}
DECL_TPL_ERROR(ObjError);
protected:
T* _ptr () const
{
return (T*)_storage;
}
char _storage[sizeof(T)];
bool _initialized;
private:
Obj (const Obj &); // no implicit copy
};
}
#endif
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