Implementation of PostTaskAndReply() in MessageLoopProxy and BrowserThread.

base/memory/ref_counted.h

 // Copyright (c) 2011 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_MEMORY_REF_COUNTED_H_
 #define BASE_MEMORY_REF_COUNTED_H_
 #pragma once
 
 #include "base/atomic_ref_count.h"
 #include "base/base_api.h"
@@ skipping 98 matching lines @@
 struct DefaultRefCountedThreadSafeTraits {
   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);
   }
 };
 
+// Use as Traits parameter to RefCountedThreadSafe in order to override how the
+// RefCountedThreadSafe subclass is destroyed.
+//
+//   class MyFoo : public base::RefCountedThreadSafe<MyFoo, ManualDestruction> {
+//    ...
+//    private:
+//     friend class ManualDestruction;
+//     void DoManualDestruction() {
+//      delete this;  // Or something else that's appropriate.
+//     }
+//   };
+//
+class ManualDestruction {
+ public:
+  template <class T>
+  static void Destruct(const T* x) {
+    T::DoManualDestruction(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:
@@ skipping 161 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_MEMORY_REF_COUNTED_H_