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// file : cult/mm/bits/shptr.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_BITS_SHPTR_HXX
#define CULT_MM_BITS_SHPTR_HXX
#include <cult/types/fundamental.hxx>
#include <cult/mm/counter.hxx>
#include <cult/mm/exception.hxx>
namespace Cult
{
namespace MM
{
namespace Bits
{
template <typename X>
class Shptr
{
protected:
~Shptr ()
{
if (c_ && c_->dec_ref ()) delete p_;
}
Shptr (X* p, Counter* c, Boolean inc = true)
: p_ (p), c_ (c)
{
if (c_ && inc) c_->inc_ref ();
}
protected:
X*
release_ () throw ()
{
X* tmp (p_);
c_ = 0;
p_ = 0;
return tmp;
}
protected:
template<typename y>
Void
assign (Shptr<y> const& bp, Boolean inc = true)
{
assign (bp.p_, bp.c_, inc);
}
Void
assign (X* p, Counter* c, Boolean inc)
{
if (c_ && c_ == c) throw SelfAssignment ();
if (c_)
{
Counter* t (c_);
c_ = 0;
p_ = 0;
t->dec_ref ();
}
if (c && inc) c->inc_ref ();
p_ = p;
c_ = c;
}
protected:
template <typename>
friend class Shptr;
X* p_;
Counter* c_;
};
}
}
}
#endif // CULT_MM_BITS_SHPTR_HXX
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