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// file : cult/mm/evptr.hxx
// author : Boris Kolpackov <boris@kolpackov.net>
// copyright : Copyright (c) 2005-2010 Boris Kolpackov
// license : GNU GPL v2 + exceptions; see accompanying LICENSE file
#ifndef CULT_MM_EVPTR_HXX
#define CULT_MM_EVPTR_HXX
#include <cult/types/fundamental.hxx>
#include <cult/mm/exception.hxx>
#include <cult/mm/bits/evptr.hxx>
#include <typeinfo> //@@ tmp
namespace Cult
{
namespace MM
{
// Leaks resource should dec_ref fail.
//
template <typename X>
class Evptr: public Bits::EvptrBase<X>
{
typedef Bits::EvptrBase<X> Base;
public:
Evptr (X* p = 0)
: Base (p, 0, locate (p, *counted))
{
}
Evptr (Evptr const& ep)
: Base (0, ep.cp_ ? ep.cp_ : ep.p_, ep.c_)
{
}
template <typename Y>
Evptr (Bits::Transfer<Y> const& ct)
: Base (ct.p_, ct.cp_, ct.c_, false)
{
Bits::Transfer<Y>& t (const_cast<Bits::Transfer<Y>&> (ct));
t.c_ = 0;
t.p_ = 0;
t.cp_ = 0;
}
template <typename Y>
Evptr (Evptr<Y> const& ep)
: Base (0, ep.cp_ ? ep.cp_ : ep.p_, ep.c_)
{
//@@
//printf ("X : %s\n", typeid (X).name ());
//printf ("Y : %s\n", typeid (Y).name ());
}
template <typename Y>
Evptr (Evptr<Y const> const& ep)
: Base (0, ep.cp_ ? ep.cp_ : ep.p_, ep.c_)
{
//@@
//printf ("X : %s\n", typeid (X).name ());
//printf ("Y : %s const\n", typeid (Y).name ());
}
public:
// After failure leaves object in destructable state.
//
Evptr&
operator= (Evptr const& ep)
{
this->assign (ep.cp_ ? ep.cp_ : ep.p_, ep.c_);
return *this;
}
template <typename Y>
Evptr&
operator= (Evptr<Y> const& ep)
{
this->assign (ep.cp_ ? ep.cp_ : ep.p_, ep.c_);
return *this;
}
template <typename Y>
Evptr&
operator= (Bits::Transfer<Y> const& ct)
{
Bits::Transfer<Y>& t (const_cast<Bits::Transfer<Y>&> (ct));
transfer (t.p_, t.cp_, t.c_);
t.c_ = 0;
t.p_ = 0;
t.cp_ = 0;
return *this;
}
protected:
using Base::get_;
public:
X*
operator-> () const
{
if (X* p = get_ ()) return p;
throw NullPointer ();
}
X&
operator* () const
{
if (X* p = get_ ()) return *p;
throw NullPointer ();
}
Bits::Transfer<X>
operator~ ()
{
Counter* c (c_);
X* p (p_);
X const* cp (cp_);
c_ = 0;
p_ = 0;
cp_ = 0;
return Bits::Transfer<X> (p, cp, c);
}
public:
using Base::p_;
using Base::cp_;
using Base::c_;
// Object pointed to by this becomes null.
//
template<typename Y>
Evptr<Y>
s_cast ()
{
if (p_)
{
Counter* c (c_);
Y* p (static_cast<Y*> (p_));
c_ = 0;
p_ = 0;
cp_ = 0;
return Evptr<Y> (p, 0, c);
}
else
{
Counter* c (c_);
Y const* cp (static_cast<Y const*> (cp_));
c_ = 0;
p_ = 0;
cp_ = 0;
return Evptr<Y> (0, cp, c);
}
}
// Object pointed to by this becomes null if dynamic_cast succeeds.
//
template<typename Y>
Evptr<Y>
d_cast ()
{
if (p_)
{
if (Y* p = dynamic_cast<Y*> (p_))
{
Counter* c (c_);
c_ = 0;
p_ = 0;
cp_ = 0;
return Evptr<Y> (p, 0, c);
}
}
else if (Y const* cp = dynamic_cast<Y const*> (cp_))
{
Counter* c (c_);
c_ = 0;
p_ = 0;
cp_ = 0;
return Evptr<Y> (0, cp, c);
}
return Evptr<Y> (0);
}
private:
Evptr (X* p, X const* cp, Counter* c) // for *_cast
: Base (p, cp, c, false)
{
}
private:
template <typename>
friend class Evptr;
};
}
using MM::Evptr;
}
#endif // CULT_MM_EVPTR_HXX
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