mirror of
https://github.com/mozilla/gecko-dev.git
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407 lines
13 KiB
C++
407 lines
13 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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// vim:cindent:ts=4:et:sw=4:
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is nsAutoPtr.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by the Initial Developer are Copyright (C)
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* 2001 the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@fas.harvard.edu> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsCOMPtr.h" // for |already_AddRefed|
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#include "nsMemory.h" // for |nsMemory::Free| for |nsMemoryAutoPtr|
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template <class T>
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class
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nsAutoPtr
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{
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private:
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inline void enter(T* aPtr) { }
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inline void exit(T* aPtr) { delete aPtr; }
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public:
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nsAutoPtr() : mPtr(0) { }
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// not |explicit| to allow |nsAutoPtr<T> ptr = foo;|
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nsAutoPtr(T* aPtr) : mPtr(aPtr) { enter(aPtr); }
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~nsAutoPtr() { exit(mPtr); }
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nsAutoPtr<T>&
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operator=(T* aPtr)
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{
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T* temp = mPtr;
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enter(aPtr);
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mPtr = aPtr;
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exit(temp);
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return *this;
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}
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nsAutoPtr<T>&
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operator=(nsAutoPtr<T>& aSmartPtr)
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{
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T* temp = mPtr;
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enter(aPtr);
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mPtr = aPtr.release();
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exit(temp);
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return *this;
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}
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operator T*() const { return mPtr; }
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T* get() const { return mPtr; }
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T* release() { T* temp = mPtr; mPtr = 0; return temp; }
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// To be used only by helpers (such as |getter_Transfers| below)
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T** begin_assignment() { mPtr = 0; return &mPtr; }
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private:
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// Helpers (such as |getter_Transfers| below) should use
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// begin_assignment(), others should not do this.
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nsAutoPtr<T>* operator&() { return this; }
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T* mPtr;
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};
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template <class T>
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class
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nsAutoArrayPtr
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{
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private:
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inline void enter(T* aPtr) { }
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inline void exit(T* aPtr) { delete [] aPtr; }
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public:
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nsAutoArrayPtr() : mPtr(0) { }
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// not |explicit| to allow |nsAutoArrayPtr<T> ptr = foo;|
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nsAutoArrayPtr(T* aPtr) : mPtr(aPtr) { enter(aPtr); }
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~nsAutoArrayPtr() { exit(mPtr); }
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nsAutoArrayPtr<T>&
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operator=(T* aPtr)
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{
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T* temp = mPtr;
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enter(aPtr);
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mPtr = aPtr;
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exit(temp);
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return *this;
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}
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nsAutoArrayPtr<T>&
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operator=(nsAutoArrayPtr<T>& aSmartPtr)
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{
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T* temp = mPtr;
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enter(aPtr);
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mPtr = aPtr.release();
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exit(temp);
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return *this;
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}
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operator T*() const { return mPtr; }
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T* get() const { return mPtr; }
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T* release() { T* temp = mPtr; mPtr = 0; return temp; }
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// To be used only by helpers (such as |getter_Transfers| below)
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T** begin_assignment() { mPtr = 0; return &mPtr; }
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private:
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// Helpers (such as |getter_Transfers| below) should use
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// begin_assignment(), others should not do this.
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nsAutoArrayPtr<T>* operator&() { return this; }
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T* mPtr;
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};
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/*
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* NOTE: nsMemoryAutoArrayPtr uses nsMemory, not nsIMemory, so using it
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* requires linking against the xpcom library.
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*/
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template <class T>
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class
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nsMemoryAutoPtr
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{
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private:
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inline void enter(T* aPtr) { }
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inline void exit(T* aPtr) { nsMemory::Free(aPtr); }
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public:
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nsMemoryAutoPtr() : mPtr(0) { }
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// not |explicit| to allow |nsMemoryAutoPtr<T> ptr = foo;|
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nsMemoryAutoPtr(T* aPtr) : mPtr(aPtr) { enter(aPtr); }
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~nsMemoryAutoPtr() { exit(mPtr); }
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nsMemoryAutoPtr<T>&
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operator=(T* aPtr)
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{
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T* temp = mPtr;
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enter(aPtr);
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mPtr = aPtr;
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exit(temp);
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return *this;
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}
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nsMemoryAutoPtr<T>&
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operator=(nsMemoryAutoPtr<T>& aSmartPtr)
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{
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T* temp = mPtr;
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enter(aPtr);
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mPtr = aPtr.release();
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exit(temp);
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return *this;
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}
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operator T*() const { return mPtr; }
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T* get() const { return mPtr; }
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T* release() { T* temp = mPtr; mPtr = 0; return temp; }
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// To be used only by helpers (such as |getter_Transfers| below)
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T** begin_assignment() { mPtr = 0; return &mPtr; }
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private:
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// Helpers (such as |getter_Transfers| below) should use
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// begin_assignment(), others should not do this.
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nsMemoryAutoPtr<T>* operator&() { return this; }
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T* mPtr;
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};
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template <class T>
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class
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nsRefPtr
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{
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private:
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inline void enter(T* aPtr) { aPtr->AddRef(); }
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inline void exit(T* aPtr) { aPtr->Release(); }
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public:
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nsRefPtr() : mPtr(0) { }
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// not |explicit| to allow |nsRefPtr<T> ptr = foo;|
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nsRefPtr(T* aPtr) : mPtr(aPtr) { enter(aPtr); }
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nsRefPtr(const already_AddRefed<T>& aPtr) : mPtr(aPtr.get()) { }
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// needed because ctor for already_AddRefed<T> is not explicit
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nsRefPtr(const nsRefPtr<T>& aPtr) : mPtr(aPtr.get()) { enter(mPtr); }
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~nsRefPtr() { exit(mPtr); }
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nsRefPtr<T>&
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operator=(T* aPtr)
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{
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T* temp = mPtr;
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enter(aPtr);
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mPtr = aPtr;
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exit(temp);
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return *this;
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}
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nsRefPtr<T>&
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operator=(already_AddRefed<T> aPtr)
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{
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T* temp = mPtr;
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mPtr = aPtr.get();
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exit(temp);
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return *this;
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}
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operator T*() const { return mPtr; }
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T* get() const { return mPtr; }
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// To be used only by helpers (such as |getter_AddRefs| below)
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T** begin_assignment_assuming_AddRef() { mPtr = 0 ; return &mPtr; }
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private:
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// Helpers (such as |getter_AddRefs| below) should use
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// begin_assignment_assuming_AddRef(), others should not do this.
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nsRefPtr<T>* operator&() { return this; }
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T* mPtr;
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};
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template <class T>
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class
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nsAutoPtrGetterTransfers
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{
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public:
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explicit nsAutoPtrGetterTransfers(nsAutoPtr<T>& aSmartPtr)
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: mPtrPtr(aSmartPtr.begin_assignment()) { }
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operator T**() { return mPtrPtr; }
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T& operator*() { return *mPtrPtr; }
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private:
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T** mPtrPtr;
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};
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template <class T>
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inline nsAutoPtrGetterTransfers<T>
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getter_Transfers(nsAutoPtr<T>& aSmartPtr)
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{
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return nsAutoPtrGetterTransfers<T>(aSmartPtr);
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}
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template <class T>
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class
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nsAutoArrayPtrGetterTransfers
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{
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public:
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explicit nsAutoArrayPtrGetterTransfers(nsAutoArrayPtr<T>& aSmartPtr)
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: mPtrPtr(aSmartPtr.begin_assignment()) { }
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operator T**() { return mPtrPtr; }
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T& operator*() { return *mPtrPtr; }
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private:
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T** mPtrPtr;
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};
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template <class T>
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inline nsAutoArrayPtrGetterTransfers<T>
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getter_Transfers(nsAutoArrayPtr<T>& aSmartPtr)
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{
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return nsAutoArrayPtrGetterTransfers<T>(aSmartPtr);
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}
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template <class T>
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class
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nsMemoryAutoPtrGetterTransfers
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{
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public:
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explicit nsMemoryAutoPtrGetterTransfers(nsMemoryAutoPtr<T>& aSmartPtr)
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: mPtrPtr(aSmartPtr.begin_assignment()) { }
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operator T**() { return mPtrPtr; }
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T& operator*() { return *mPtrPtr; }
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private:
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T** mPtrPtr;
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};
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template <class T>
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inline nsMemoryAutoPtrGetterTransfers<T>
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getter_Transfers(nsMemoryAutoPtr<T>& aSmartPtr)
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{
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return nsMemoryAutoPtrGetterTransfers<T>(aSmartPtr);
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}
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template <class T>
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class
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nsRefPtrGetterAddRefs
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{
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public:
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explicit nsRefPtrGetterAddRefs(nsRefPtr<T>& aSmartPtr)
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: mPtrPtr(aSmartPtr.begin_assignment_assuming_AddRef()) { }
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operator T**() { return mPtrPtr; }
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T& operator*() { return *mPtrPtr; }
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private:
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T** mPtrPtr;
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};
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template <class T>
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inline nsRefPtrGetterAddRefs<T>
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getter_AddRefs(nsRefPtr<T>& aSmartPtr)
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{
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return nsRefPtrGetterAddRefs<T>(aSmartPtr);
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}
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#define EQ_OP(op_, lhtype_, rhtype_, lhget_, rhget_) \
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template <class T, class U> \
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inline PRBool \
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operator op_( lhtype_ lhs, rhtype_ rhs ) \
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{ \
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return lhs lhget_ op_ rhs rhget_; \
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}
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#define NS_AUTO_PTR_EMPTY_
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#define SMART_SMART_EQ_OP(op_, type_, lhconst_, rhconst_) \
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EQ_OP(op_, const type_<lhconst_ T>&, const type_<rhconst_ U>&, \
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.get(), .get())
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#define SMART_RAW_EQ_OP(op_, type_, lhconst_, rhconst_) \
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EQ_OP(op_, const type_<lhconst_ T>&, rhconst_ U *, \
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.get(), NS_AUTO_PTR_EMPTY_)
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#define RAW_SMART_EQ_OP(op_, type_, lhconst_, rhconst_) \
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EQ_OP(op_, lhconst_ T *, const type_<rhconst_ U>&, \
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NS_AUTO_PTR_EMPTY_, .get())
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#define PORTABLE_EQ_OPS(type_) \
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SMART_SMART_EQ_OP(==, type_, const, const) \
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SMART_SMART_EQ_OP(!=, type_, const, const) \
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SMART_RAW_EQ_OP(==, type_, const, const) \
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SMART_RAW_EQ_OP(!=, type_, const, const) \
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RAW_SMART_EQ_OP(==, type_, const, const) \
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RAW_SMART_EQ_OP(!=, type_, const, const)
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#define NON_CONST_EQ_OPS(type_) \
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SMART_SMART_EQ_OP(==, type_, NS_AUTO_PTR_EMPTY_, const) \
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SMART_SMART_EQ_OP(!=, type_, NS_AUTO_PTR_EMPTY_, const) \
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SMART_SMART_EQ_OP(==, type_, const, NS_AUTO_PTR_EMPTY_) \
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SMART_SMART_EQ_OP(!=, type_, const, NS_AUTO_PTR_EMPTY_) \
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SMART_SMART_EQ_OP(==, type_, NS_AUTO_PTR_EMPTY_, NS_AUTO_PTR_EMPTY_) \
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SMART_SMART_EQ_OP(!=, type_, NS_AUTO_PTR_EMPTY_, NS_AUTO_PTR_EMPTY_) \
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SMART_RAW_EQ_OP(==, type_, NS_AUTO_PTR_EMPTY_, const) \
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SMART_RAW_EQ_OP(!=, type_, NS_AUTO_PTR_EMPTY_, const) \
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SMART_RAW_EQ_OP(==, type_, const, NS_AUTO_PTR_EMPTY_) \
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SMART_RAW_EQ_OP(!=, type_, const, NS_AUTO_PTR_EMPTY_) \
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SMART_RAW_EQ_OP(==, type_, NS_AUTO_PTR_EMPTY_, NS_AUTO_PTR_EMPTY_) \
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SMART_RAW_EQ_OP(!=, type_, NS_AUTO_PTR_EMPTY_, NS_AUTO_PTR_EMPTY_) \
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RAW_SMART_EQ_OP(==, type_, NS_AUTO_PTR_EMPTY_, const) \
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RAW_SMART_EQ_OP(!=, type_, NS_AUTO_PTR_EMPTY_, const) \
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RAW_SMART_EQ_OP(==, type_, const, NS_AUTO_PTR_EMPTY_) \
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RAW_SMART_EQ_OP(!=, type_, const, NS_AUTO_PTR_EMPTY_) \
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RAW_SMART_EQ_OP(==, type_, NS_AUTO_PTR_EMPTY_, NS_AUTO_PTR_EMPTY_) \
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RAW_SMART_EQ_OP(!=, type_, NS_AUTO_PTR_EMPTY_, NS_AUTO_PTR_EMPTY_)
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#ifdef NSCAP_DONT_PROVIDE_NONCONST_OPEQ
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#define ALL_EQ_OPS(type_) \
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PORTABLE_EQ_OPS(type_)
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#else
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#define ALL_EQ_OPS(type_) \
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NON_CONST_EQ_OPS(type_) \
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PORTABLE_EQ_OPS(type_)
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#endif
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ALL_EQ_OPS(nsAutoPtr)
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ALL_EQ_OPS(nsAutoArrayPtr)
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ALL_EQ_OPS(nsMemoryAutoPtr)
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ALL_EQ_OPS(nsRefPtr)
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