Class scoped_ptr

src/include/base/cef_scoped_ptr.h:353–486

// types.
template <class T, class D = base::DefaultDeleter<T>>
class scoped_ptr {
  MOVE_ONLY_TYPE_FOR_CPP_03(scoped_ptr, RValue)

  COMPILE_ASSERT(base::cef_internal::IsNotRefCounted<T>::value,
                 T_is_refcounted_type_and_needs_scoped_refptr);

 public:
  // The element and deleter types.
  typedef T element_type;
  typedef D deleter_type;

  // Constructor.  Defaults to initializing with NULL.
  scoped_ptr() : impl_(NULL) {}

  // Constructor.  Takes ownership of p.
  explicit scoped_ptr(element_type* p) : impl_(p) {}

  // Constructor.  Allows initialization of a stateful deleter.
  scoped_ptr(element_type* p, const D& d) : impl_(p, d) {}

  // Constructor.  Allows construction from a scoped_ptr rvalue for a
  // convertible type and deleter.
  //
  // IMPLEMENTATION NOTE: C++11 unique_ptr<> keeps this constructor distinct
  // from the normal move constructor. By C++11 20.7.1.2.1.21, this constructor
  // has different post-conditions if D is a reference type. Since this
  // implementation does not support deleters with reference type,
  // we do not need a separate move constructor allowing us to avoid one
  // use of SFINAE. You only need to care about this if you modify the
  // implementation of scoped_ptr.
  template <typename U, typename V>
  scoped_ptr(scoped_ptr<U, V> other) : impl_(&other.impl_) {
    COMPILE_ASSERT(!base::is_array<U>::value, U_cannot_be_an_array);
  }

  // Constructor.  Move constructor for C++03 move emulation of this type.
  scoped_ptr(RValue rvalue) : impl_(&rvalue.object->impl_) {}

  // operator=.  Allows assignment from a scoped_ptr rvalue for a convertible
  // type and deleter.
  //
  // IMPLEMENTATION NOTE: C++11 unique_ptr<> keeps this operator= distinct from
  // the normal move assignment operator. By C++11 20.7.1.2.3.4, this templated
  // form has different requirements on for move-only Deleters. Since this
  // implementation does not support move-only Deleters, we do not need a
  // separate move assignment operator allowing us to avoid one use of SFINAE.
  // You only need to care about this if you modify the implementation of
  // scoped_ptr.
  template <typename U, typename V>
  scoped_ptr& operator=(scoped_ptr<U, V> rhs) {
    COMPILE_ASSERT(!base::is_array<U>::value, U_cannot_be_an_array);
    impl_.TakeState(&rhs.impl_);
    return *this;
  }

  // Reset.  Deletes the currently owned object, if any.
  // Then takes ownership of a new object, if given.
  void reset(element_type* p = NULL) { impl_.reset(p); }