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// file : cutl/shared-ptr.hxx
// copyright : Copyright (c) 2009-2013 Code Synthesis Tools CC
// license : MIT; see accompanying LICENSE file
#ifndef CUTL_SHARED_PTR_HXX
#define CUTL_SHARED_PTR_HXX
#include <cutl/shared-ptr/base.hxx>
namespace cutl
{
template <typename X>
class shared_ptr: bits::counter_ops<typename bits::counter_type<X>::r, X>
{
typedef bits::counter_ops<typename bits::counter_type<X>::r, X> base;
public:
~shared_ptr ()
{
if (x_ != 0)
base::dec (x_);
}
explicit
shared_ptr (X* x = 0)
: base (x), x_ (x)
{
}
shared_ptr (shared_ptr const& x)
: base (x), x_ (x.x_)
{
if (x_ != 0)
base::inc (x_);
}
template <typename Y>
shared_ptr (shared_ptr<Y> const& x)
: base (x), x_ (x.x_)
{
if (x_ != 0)
base::inc (x_);
}
shared_ptr&
operator= (shared_ptr const& x)
{
if (x_ != x.x_)
{
if (x_ != 0)
base::dec (x_);
static_cast<base&> (*this) = x;
x_ = x.x_;
if (x_ != 0)
base::inc (x_);
}
return *this;
}
template <typename Y>
shared_ptr&
operator= (shared_ptr<Y> const& x)
{
if (x_ != x.x_)
{
if (x_ != 0)
base::dec (x_);
static_cast<base&> (*this) = x;
x_ = x.x_;
if (x_ != 0)
base::inc (x_);
}
return *this;
}
public:
X*
operator-> () const
{
return x_;
}
X&
operator* () const
{
return *x_;
}
// Conversion to bool.
//
typedef void (shared_ptr::*boolean_convertible)();
void true_value () {};
operator boolean_convertible () const
{
return x_ ? &shared_ptr<X>::true_value : 0;
}
public:
X*
get () const
{
return x_;
}
X*
release ()
{
X* r (x_);
x_ = 0;
return r;
}
void
reset (X* x = 0)
{
if (x_ != 0)
base::dec (x_);
base::reset (x);
x_ = x;
}
std::size_t
count () const
{
return x_ != 0 ? base::count (x_) : 0;
}
private:
template <typename>
friend class shared_ptr;
X* x_;
};
template <typename X, typename Y>
inline bool
operator== (const shared_ptr<X>& x, const shared_ptr<Y>& y)
{
return x.get () == y.get ();
}
template <typename X, typename Y>
inline bool
operator!= (const shared_ptr<X>& x, const shared_ptr<Y>& y)
{
return x.get () != y.get ();
}
}
#endif // CUTL_SHARED_PTR_HXX
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