base::Bind: Make use of partial currying to get rid of a helper class.

base/callback.h

 // This file was GENERATED by command:
 //     pump.py callback.h.pump
 // DO NOT EDIT BY HAND!!!
 
 
 // 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_CALLBACK_H_
@@ skipping 106 matching lines @@
 // The design Callback and Bind is heavily influenced by C++'s
 // tr1::function/tr1::bind, and by the "Google Callback" system used inside
 // Google.
 //
 //
 // HOW THE IMPLEMENTATION WORKS:
 //
 // There are three main components to the system:
 //   1) The Callback classes.
 //   2) The Bind() functions.
-//   3) The arguments wrappers (eg., Unretained() and ConstRef()).
+//   3) The arguments wrappers (e.g., Unretained() and ConstRef()).

[awong, 2011/12/12 21:56:56]

Can you also update base/callback.h.pump?

[James Hawkins, 2011/12/12 22:23:29]

Done.

 //
 // The Callback classes represent a generic function pointer. Internally,
 // it stores a refcounted piece of state that represents the target function
 // and all its bound parameters.  Each Callback specialization has a templated
 // constructor that takes an BindStateHolder<> object.  In the context of
 // the constructor, the static type of this BindStateHolder<> object
 // uniquely identifies the function it is representing, all its bound
 // parameters, and a DoInvoke() that is capable of invoking the target.
 //
 // Callback's constructor is takes the BindStateHolder<> that has the
@@ skipping 503 matching lines @@
 };
 
 
 // Syntactic sugar to make Callbacks<void(void)> easier to declare since it
 // will be used in a lot of APIs with delayed execution.
 typedef Callback<void(void)> Closure;
 
 }  // namespace base
 
 #endif  // BASE_CALLBACK_H