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#if !defined(spp_smartptr_h_guard)
#define spp_smartptr_h_guard
/* -----------------------------------------------------------------------------------------------
* quick version of intrusive_ptr
* -----------------------------------------------------------------------------------------------
*/
#include <cassert>
#include "spp_config.h"
// ------------------------------------------------------------------------
class spp_rc
{
public:
spp_rc() : _cnt(0) {}
spp_rc(const spp_rc &) : _cnt(0) {}
void increment() const { ++_cnt; }
void decrement() const { assert(_cnt); if (--_cnt == 0) delete this; }
unsigned count() const { return _cnt; }
protected:
virtual ~spp_rc() {}
private:
mutable unsigned _cnt;
};
// ------------------------------------------------------------------------
template <class T>
class spp_sptr
{
public:
spp_sptr() : _p(0) {}
spp_sptr(T *p) : _p(p) { if (_p) _p->increment(); }
spp_sptr(const spp_sptr &o) : _p(o._p) { if (_p) _p->increment(); }
#ifndef SPP_NO_CXX11_RVALUE_REFERENCES
spp_sptr(spp_sptr &&o) : _p(o._p) { o._p = (T *)0; }
spp_sptr& operator=(spp_sptr &&o) { this->swap(o); return *this; }
#endif
~spp_sptr() { if (_p) _p->decrement(); }
spp_sptr& operator=(const spp_sptr &o) { reset(o._p); return *this; }
T* get() const { return _p; }
void swap(spp_sptr &o) { T *tmp = _p; _p = o._p; o._p = tmp; }
void reset(const T *p = 0)
{
if (p == _p)
return;
if (_p) _p->decrement();
_p = (T *)p;
if (_p) _p->increment();
}
T* operator->() const { return const_cast<T *>(_p); }
bool operator!() const { return _p == 0; }
private:
T *_p;
};
// ------------------------------------------------------------------------
namespace std
{
template <class T>
inline void swap(spp_sptr<T> &a, spp_sptr<T> &b)
{
a.swap(b);
}
}
#endif // spp_smartptr_h_guard
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