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// file : odb/details/shared-ptr/base.ixx
// license : GNU GPL v2; see accompanying LICENSE file
namespace odb
{
namespace details
{
// share
//
inline share::
share (char id)
: id_ (id)
{
}
inline bool share::
operator== (share x) const
{
return id_ == x.id_;
}
// shared_base
//
inline shared_base::
shared_base ()
: counter_ (1), callback_ (0)
{
}
inline shared_base::
shared_base (const shared_base&)
: counter_ (1), callback_ (0)
{
}
inline shared_base& shared_base::
operator= (const shared_base&)
{
return *this;
}
inline void shared_base::
_inc_ref ()
{
#ifdef ODB_CXX11
counter_.fetch_add (1, std::memory_order_relaxed);
#else
++counter_;
#endif
}
inline bool shared_base::
_dec_ref ()
{
// While there are ways to avoid acquire (which is unnecessary except
// when the counter drops to zero), for our use-cases we'd rather keep
// it simple.
//
return
#ifdef ODB_CXX11
counter_.fetch_sub (1, std::memory_order_acq_rel) == 1
#else
--counter_ == 0
#endif
? callback_ == 0 || callback_->zero_counter (callback_->arg)
: false;
}
inline std::size_t shared_base::
_ref_count () const
{
#ifdef ODB_CXX11
return counter_.load (std::memory_order_relaxed);
#else
return counter_;
#endif
}
#ifdef ODB_CXX11
inline void* shared_base::
operator new (std::size_t n)
{
return ::operator new (n);
}
inline void* shared_base::
operator new (std::size_t n, share)
{
return ::operator new (n);
}
#else
inline void* shared_base::
operator new (std::size_t n) throw (std::bad_alloc)
{
return ::operator new (n);
}
inline void* shared_base::
operator new (std::size_t n, share) throw (std::bad_alloc)
{
return ::operator new (n);
}
#endif
inline void shared_base::
operator delete (void* p, share) ODB_NOTHROW_NOEXCEPT
{
::operator delete (p);
}
inline void shared_base::
operator delete (void* p) ODB_NOTHROW_NOEXCEPT
{
::operator delete (p);
}
}
}
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