Const-ify RefCountedThreadSafe::AddRef and Release.

base/ref_counted.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_REF_COUNTED_H_
 #define BASE_REF_COUNTED_H_
 #pragma once
 
 #include "base/atomic_ref_count.h"
 #include "base/thread_collision_warner.h"
@@ skipping 88 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RefCounted<T>);
 };
 
 // Forward declaration.
 template <class T, typename Traits> class RefCountedThreadSafe;
 
 // Default traits for RefCountedThreadSafe<T>.  Deletes the object when its ref
 // count reaches 0.  Overload to delete it on a different thread etc.
 template<typename T>
 struct DefaultRefCountedThreadSafeTraits {
-  static void Destruct(T* x) {
+  static void Destruct(const T* x) {
     // Delete through RefCountedThreadSafe to make child classes only need to be
     // friend with RefCountedThreadSafe instead of this struct, which is an
     // implementation detail.
     RefCountedThreadSafe<T,
                          DefaultRefCountedThreadSafeTraits>::DeleteInternal(x);
   }
 };
 
 //
 // A thread-safe variant of RefCounted<T>
 //
 //   class MyFoo : public base::RefCountedThreadSafe<MyFoo> {
 //    ...
 //   };
 //
 // If you're using the default trait, then you should add compile time
 // asserts that no one else is deleting your object.  i.e.
 //    private:
 //     friend class base::RefCountedThreadSafe<MyFoo>;
 //     ~MyFoo();
 template <class T, typename Traits = DefaultRefCountedThreadSafeTraits<T> >
 class RefCountedThreadSafe : public subtle::RefCountedThreadSafeBase {
  public:
   RefCountedThreadSafe() { }
   ~RefCountedThreadSafe() { }
 
-  void AddRef() {
+  void AddRef() const {
     subtle::RefCountedThreadSafeBase::AddRef();
   }
 
-  void Release() {
+  void Release() const {
     if (subtle::RefCountedThreadSafeBase::Release()) {
-      Traits::Destruct(static_cast<T*>(this));
+      Traits::Destruct(static_cast<const T*>(this));
     }
   }
 
  private:
   friend struct DefaultRefCountedThreadSafeTraits<T>;
-  static void DeleteInternal(T* x) { delete x; }
+  static void DeleteInternal(const T* x) { delete x; }
 
   DISALLOW_COPY_AND_ASSIGN(RefCountedThreadSafe);
 };
 
 //
 // A wrapper for some piece of data so we can place other things in
 // scoped_refptrs<>.
 //
 template<typename T>
 class RefCountedData : public base::RefCounted< base::RefCountedData<T> > {
@@ skipping 130 matching lines @@
 };
 
 // Handy utility for creating a scoped_refptr<T> out of a T* explicitly without
 // having to retype all the template arguments
 template <typename T>
 scoped_refptr<T> make_scoped_refptr(T* t) {
   return scoped_refptr<T>(t);
 }
 
 #endif  // BASE_REF_COUNTED_H_