Add m-esr52 at 52.6.0

1 files changed, 454 insertions, 0 deletions

diff --git a/xpcom/base/nsAutoPtr.h b/xpcom/base/nsAutoPtr.h
new file mode 100644
index 000000000..b5a15000c
--- /dev/null
+++ b/xpcom/base/nsAutoPtr.h
@@ -0,0 +1,454 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsAutoPtr_h
+#define nsAutoPtr_h
+
+#include "nsCOMPtr.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/TypeTraits.h"
+
+#include "nsCycleCollectionNoteChild.h"
+#include "mozilla/MemoryReporting.h"
+
+/*****************************************************************************/
+
+// template <class T> class nsAutoPtrGetterTransfers;
+
+template <class T>
+class nsAutoPtr
+{
+private:
+  static_assert(!mozilla::IsScalar<T>::value, "If you are using "
+                "nsAutoPtr to hold an array, use UniquePtr<T[]> instead");
+
+  void**
+  begin_assignment()
+  {
+    assign(0);
+    return reinterpret_cast<void**>(&mRawPtr);
+  }
+
+  void
+  assign(T* aNewPtr)
+  {
+    T* oldPtr = mRawPtr;
+
+    if (aNewPtr && aNewPtr == oldPtr) {
+      NS_RUNTIMEABORT("Logic flaw in the caller");
+    }
+
+    mRawPtr = aNewPtr;
+    delete oldPtr;
+  }
+
+  // |class Ptr| helps us prevent implicit "copy construction"
+  // through |operator T*() const| from a |const nsAutoPtr<T>|
+  // because two implicit conversions in a row aren't allowed.
+  // It still allows assignment from T* through implicit conversion
+  // from |T*| to |nsAutoPtr<T>::Ptr|
+  class Ptr
+  {
+  public:
+    MOZ_IMPLICIT Ptr(T* aPtr)
+      : mPtr(aPtr)
+    {
+    }
+
+    operator T*() const
+    {
+      return mPtr;
+    }
+
+  private:
+    T* MOZ_NON_OWNING_REF mPtr;
+  };
+
+private:
+  T* MOZ_OWNING_REF mRawPtr;
+
+public:
+  typedef T element_type;
+
+  ~nsAutoPtr()
+  {
+    delete mRawPtr;
+  }
+
+  // Constructors
+
+  nsAutoPtr()
+    : mRawPtr(0)
+    // default constructor
+  {
+  }
+
+  MOZ_IMPLICIT nsAutoPtr(Ptr aRawPtr)
+    : mRawPtr(aRawPtr)
+    // construct from a raw pointer (of the right type)
+  {
+  }
+
+  // This constructor shouldn't exist; we should just use the &&
+  // constructor.
+  nsAutoPtr(nsAutoPtr<T>& aSmartPtr)
+    : mRawPtr(aSmartPtr.forget())
+    // Construct by transferring ownership from another smart pointer.
+  {
+  }
+
+  template <typename I>
+  MOZ_IMPLICIT nsAutoPtr(nsAutoPtr<I>& aSmartPtr)
+    : mRawPtr(aSmartPtr.forget())
+    // Construct by transferring ownership from another smart pointer.
+  {
+  }
+
+  nsAutoPtr(nsAutoPtr<T>&& aSmartPtr)
+    : mRawPtr(aSmartPtr.forget())
+    // Construct by transferring ownership from another smart pointer.
+  {
+  }
+
+  template <typename I>
+  MOZ_IMPLICIT nsAutoPtr(nsAutoPtr<I>&& aSmartPtr)
+    : mRawPtr(aSmartPtr.forget())
+    // Construct by transferring ownership from another smart pointer.
+  {
+  }
+
+  // Assignment operators
+
+  nsAutoPtr<T>&
+  operator=(T* aRhs)
+  // assign from a raw pointer (of the right type)
+  {
+    assign(aRhs);
+    return *this;
+  }
+
+  nsAutoPtr<T>& operator=(nsAutoPtr<T>& aRhs)
+  // assign by transferring ownership from another smart pointer.
+  {
+    assign(aRhs.forget());
+    return *this;
+  }
+
+  template <typename I>
+  nsAutoPtr<T>& operator=(nsAutoPtr<I>& aRhs)
+  // assign by transferring ownership from another smart pointer.
+  {
+    assign(aRhs.forget());
+    return *this;
+  }
+
+  nsAutoPtr<T>& operator=(nsAutoPtr<T>&& aRhs)
+  {
+    assign(aRhs.forget());
+    return *this;
+  }
+
+  template <typename I>
+  nsAutoPtr<T>& operator=(nsAutoPtr<I>&& aRhs)
+  {
+    assign(aRhs.forget());
+    return *this;
+  }
+
+  // Other pointer operators
+
+  T*
+  get() const
+  /*
+    Prefer the implicit conversion provided automatically by
+    |operator T*() const|.  Use |get()| _only_ to resolve
+    ambiguity.
+  */
+  {
+    return mRawPtr;
+  }
+
+  operator T*() const
+  /*
+    ...makes an |nsAutoPtr| act like its underlying raw pointer
+    type  whenever it is used in a context where a raw pointer
+    is expected.  It is this operator that makes an |nsAutoPtr|
+    substitutable for a raw pointer.
+
+    Prefer the implicit use of this operator to calling |get()|,
+    except where necessary to resolve ambiguity.
+  */
+  {
+    return get();
+  }
+
+  T*
+  forget()
+  {
+    T* temp = mRawPtr;
+    mRawPtr = 0;
+    return temp;
+  }
+
+  T*
+  operator->() const
+  {
+    NS_PRECONDITION(mRawPtr != 0,
+                    "You can't dereference a NULL nsAutoPtr with operator->().");
+    return get();
+  }
+
+  template <typename R, typename... Args>
+  class Proxy
+  {
+    typedef R (T::*member_function)(Args...);
+    T* mRawPtr;
+    member_function mFunction;
+  public:
+    Proxy(T* aRawPtr, member_function aFunction)
+      : mRawPtr(aRawPtr),
+        mFunction(aFunction)
+    {
+    }
+    template<typename... ActualArgs>
+    R operator()(ActualArgs&&... aArgs)
+    {
+      return ((*mRawPtr).*mFunction)(mozilla::Forward<ActualArgs>(aArgs)...);
+    }
+  };
+
+  template <typename R, typename C, typename... Args>
+  Proxy<R, Args...> operator->*(R (C::*aFptr)(Args...)) const
+  {
+    NS_PRECONDITION(mRawPtr != 0,
+                    "You can't dereference a NULL nsAutoPtr with operator->*().");
+    return Proxy<R, Args...>(get(), aFptr);
+  }
+
+  nsAutoPtr<T>*
+  get_address()
+  // This is not intended to be used by clients.  See |address_of|
+  // below.
+  {
+    return this;
+  }
+
+  const nsAutoPtr<T>*
+  get_address() const
+  // This is not intended to be used by clients.  See |address_of|
+  // below.
+  {
+    return this;
+  }
+
+public:
+  T&
+  operator*() const
+  {
+    NS_PRECONDITION(mRawPtr != 0,
+                    "You can't dereference a NULL nsAutoPtr with operator*().");
+    return *get();
+  }
+
+  T**
+  StartAssignment()
+  {
+#ifndef NSCAP_FEATURE_INLINE_STARTASSIGNMENT
+    return reinterpret_cast<T**>(begin_assignment());
+#else
+    assign(0);
+    return reinterpret_cast<T**>(&mRawPtr);
+#endif
+  }
+};
+
+template <class T>
+inline nsAutoPtr<T>*
+address_of(nsAutoPtr<T>& aPtr)
+{
+  return aPtr.get_address();
+}
+
+template <class T>
+inline const nsAutoPtr<T>*
+address_of(const nsAutoPtr<T>& aPtr)
+{
+  return aPtr.get_address();
+}
+
+template <class T>
+class nsAutoPtrGetterTransfers
+/*
+  ...
+
+  This class is designed to be used for anonymous temporary objects in the
+  argument list of calls that return COM interface pointers, e.g.,
+
+    nsAutoPtr<IFoo> fooP;
+    ...->GetTransferedPointer(getter_Transfers(fooP))
+
+  DO NOT USE THIS TYPE DIRECTLY IN YOUR CODE.  Use |getter_Transfers()| instead.
+
+  When initialized with a |nsAutoPtr|, as in the example above, it returns
+  a |void**|, a |T**|, or an |nsISupports**| as needed, that the
+  outer call (|GetTransferedPointer| in this case) can fill in.
+
+  This type should be a nested class inside |nsAutoPtr<T>|.
+*/
+{
+public:
+  explicit
+  nsAutoPtrGetterTransfers(nsAutoPtr<T>& aSmartPtr)
+    : mTargetSmartPtr(aSmartPtr)
+  {
+    // nothing else to do
+  }
+
+  operator void**()
+  {
+    return reinterpret_cast<void**>(mTargetSmartPtr.StartAssignment());
+  }
+
+  operator T**()
+  {
+    return mTargetSmartPtr.StartAssignment();
+  }
+
+  T*&
+  operator*()
+  {
+    return *(mTargetSmartPtr.StartAssignment());
+  }
+
+private:
+  nsAutoPtr<T>& mTargetSmartPtr;
+};
+
+template <class T>
+inline nsAutoPtrGetterTransfers<T>
+getter_Transfers(nsAutoPtr<T>& aSmartPtr)
+/*
+  Used around a |nsAutoPtr| when
+  ...makes the class |nsAutoPtrGetterTransfers<T>| invisible.
+*/
+{
+  return nsAutoPtrGetterTransfers<T>(aSmartPtr);
+}
+
+
+
+// Comparing two |nsAutoPtr|s
+
+template <class T, class U>
+inline bool
+operator==(const nsAutoPtr<T>& aLhs, const nsAutoPtr<U>& aRhs)
+{
+  return static_cast<const T*>(aLhs.get()) == static_cast<const U*>(aRhs.get());
+}
+
+
+template <class T, class U>
+inline bool
+operator!=(const nsAutoPtr<T>& aLhs, const nsAutoPtr<U>& aRhs)
+{
+  return static_cast<const T*>(aLhs.get()) != static_cast<const U*>(aRhs.get());
+}
+
+
+// Comparing an |nsAutoPtr| to a raw pointer
+
+template <class T, class U>
+inline bool
+operator==(const nsAutoPtr<T>& aLhs, const U* aRhs)
+{
+  return static_cast<const T*>(aLhs.get()) == static_cast<const U*>(aRhs);
+}
+
+template <class T, class U>
+inline bool
+operator==(const U* aLhs, const nsAutoPtr<T>& aRhs)
+{
+  return static_cast<const U*>(aLhs) == static_cast<const T*>(aRhs.get());
+}
+
+template <class T, class U>
+inline bool
+operator!=(const nsAutoPtr<T>& aLhs, const U* aRhs)
+{
+  return static_cast<const T*>(aLhs.get()) != static_cast<const U*>(aRhs);
+}
+
+template <class T, class U>
+inline bool
+operator!=(const U* aLhs, const nsAutoPtr<T>& aRhs)
+{
+  return static_cast<const U*>(aLhs) != static_cast<const T*>(aRhs.get());
+}
+
+template <class T, class U>
+inline bool
+operator==(const nsAutoPtr<T>& aLhs, U* aRhs)
+{
+  return static_cast<const T*>(aLhs.get()) == const_cast<const U*>(aRhs);
+}
+
+template <class T, class U>
+inline bool
+operator==(U* aLhs, const nsAutoPtr<T>& aRhs)
+{
+  return const_cast<const U*>(aLhs) == static_cast<const T*>(aRhs.get());
+}
+
+template <class T, class U>
+inline bool
+operator!=(const nsAutoPtr<T>& aLhs, U* aRhs)
+{
+  return static_cast<const T*>(aLhs.get()) != const_cast<const U*>(aRhs);
+}
+
+template <class T, class U>
+inline bool
+operator!=(U* aLhs, const nsAutoPtr<T>& aRhs)
+{
+  return const_cast<const U*>(aLhs) != static_cast<const T*>(aRhs.get());
+}
+
+
+
+// Comparing an |nsAutoPtr| to |nullptr|
+
+template <class T>
+inline bool
+operator==(const nsAutoPtr<T>& aLhs, decltype(nullptr))
+{
+  return aLhs.get() == nullptr;
+}
+
+template <class T>
+inline bool
+operator==(decltype(nullptr), const nsAutoPtr<T>& aRhs)
+{
+  return nullptr == aRhs.get();
+}
+
+template <class T>
+inline bool
+operator!=(const nsAutoPtr<T>& aLhs, decltype(nullptr))
+{
+  return aLhs.get() != nullptr;
+}
+
+template <class T>
+inline bool
+operator!=(decltype(nullptr), const nsAutoPtr<T>& aRhs)
+{
+  return nullptr != aRhs.get();
+}
+
+
+/*****************************************************************************/
+
+#endif // !defined(nsAutoPtr_h)