// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
-// See http://www.boost.org/libs/smart_ptr/scoped_ptr.htm for documentation.
+// http://www.boost.org/libs/smart_ptr/scoped_ptr.htm
//
#include <boost/assert.hpp>
#include <boost/checked_delete.hpp>
+#include <boost/detail/workaround.hpp>
+
+#ifndef BOOST_NO_AUTO_PTR
+# include <memory> // for std::auto_ptr
+#endif
namespace boost
{
+// Debug hooks
+
+#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
+
+void sp_scalar_constructor_hook(void * p);
+void sp_scalar_destructor_hook(void * p);
+
+#endif
+
// scoped_ptr mimics a built-in pointer except that it guarantees deletion
// of the object pointed to, either on destruction of the scoped_ptr or via
// an explicit reset(). scoped_ptr is a simple solution for simple needs;
// use shared_ptr or std::auto_ptr if your needs are more complex.
-template<typename T> class scoped_ptr // noncopyable
+template<class T> class scoped_ptr // noncopyable
{
private:
- T* ptr;
+ T * ptr;
scoped_ptr(scoped_ptr const &);
scoped_ptr & operator=(scoped_ptr const &);
+ typedef scoped_ptr<T> this_type;
+
public:
typedef T element_type;
explicit scoped_ptr(T * p = 0): ptr(p) // never throws
{
+#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
+ boost::sp_scalar_constructor_hook(ptr);
+#endif
}
+#ifndef BOOST_NO_AUTO_PTR
+
+ explicit scoped_ptr(std::auto_ptr<T> p): ptr(p.release()) // never throws
+ {
+#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
+ boost::sp_scalar_constructor_hook(ptr);
+#endif
+ }
+
+#endif
+
~scoped_ptr() // never throws
{
- checked_delete(ptr);
+#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
+ boost::sp_scalar_destructor_hook(ptr);
+#endif
+ boost::checked_delete(ptr);
}
void reset(T * p = 0) // never throws
{
- if (ptr != p)
- {
- checked_delete(ptr);
- ptr = p;
- }
+ BOOST_ASSERT(p == 0 || p != ptr); // catch self-reset errors
+ this_type(p).swap(*this);
}
T & operator*() const // never throws
return ptr;
}
+ // implicit conversion to "bool"
+
+#if defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x530)
+
+ operator bool () const
+ {
+ return ptr != 0;
+ }
+
+#else
+
+ typedef T * (this_type::*unspecified_bool_type)() const;
+
+ operator unspecified_bool_type() const // never throws
+ {
+ return ptr == 0? 0: &this_type::get;
+ }
+
+#endif
+
+ bool operator! () const // never throws
+ {
+ return ptr == 0;
+ }
+
void swap(scoped_ptr & b) // never throws
{
T * tmp = b.ptr;
}
};
-template<typename T> inline void swap(scoped_ptr<T> & a, scoped_ptr<T> & b) // never throws
+template<class T> inline void swap(scoped_ptr<T> & a, scoped_ptr<T> & b) // never throws
{
a.swap(b);
}
+// get_pointer(p) is a generic way to say p.get()
+
+template<class T> inline T * get_pointer(scoped_ptr<T> const & p)
+{
+ return p.get();
+}
+
} // namespace boost
#endif // #ifndef BOOST_SCOPED_PTR_HPP_INCLUDED