The Tor Browser: security/sandbox/chromium/base/callback.h@6474c204b198 (annotated)

security/sandbox/chromium/base/callback.h@6474c204b198 (annotated)

security/sandbox/chromium/base/callback.h

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 // This file was GENERATED by command:
 //     pump.py callback.h.pump
 // DO NOT EDIT BY HAND!!!
 // Copyright (c) 2012 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_
 #define BASE_CALLBACK_H_
 #include "base/callback_forward.h"
 #include "base/callback_internal.h"
 #include "base/template_util.h"
 // NOTE: Header files that do not require the full definition of Callback or
 // Closure should #include "base/callback_forward.h" instead of this file.
 // -----------------------------------------------------------------------------
 // Introduction
 // -----------------------------------------------------------------------------
 //
 // The templated Callback class is a generalized function object. Together
 // with the Bind() function in bind.h, they provide a type-safe method for
 // performing partial application of functions.
 //
 // Partial application (or "currying") is the process of binding a subset of
 // a function's arguments to produce another function that takes fewer
 // arguments. This can be used to pass around a unit of delayed execution,
 // much like lexical closures are used in other languages. For example, it
 // is used in Chromium code to schedule tasks on different MessageLoops.
 //
 // A callback with no unbound input parameters (base::Callback<void(void)>)
 // is called a base::Closure. Note that this is NOT the same as what other
 // languages refer to as a closure -- it does not retain a reference to its
 // enclosing environment.
 //
 // MEMORY MANAGEMENT AND PASSING
 //
 // The Callback objects themselves should be passed by const-reference, and
 // stored by copy. They internally store their state via a refcounted class
 // and thus do not need to be deleted.
 //
 // The reason to pass via a const-reference is to avoid unnecessary
 // AddRef/Release pairs to the internal state.
 //
 //
 // -----------------------------------------------------------------------------
 // Quick reference for basic stuff
 // -----------------------------------------------------------------------------
 //
 // BINDING A BARE FUNCTION
 //
 //   int Return5() { return 5; }
 //   base::Callback<int(void)> func_cb = base::Bind(&Return5);
 //   LOG(INFO) << func_cb.Run();  // Prints 5.
 //
 // BINDING A CLASS METHOD
 //
 //   The first argument to bind is the member function to call, the second is
 //   the object on which to call it.
 //
 //   class Ref : public base::RefCountedThreadSafe<Ref> {
 //    public:
 //     int Foo() { return 3; }
 //     void PrintBye() { LOG(INFO) << "bye."; }
 //   };
 //   scoped_refptr<Ref> ref = new Ref();
 //   base::Callback<void(void)> ref_cb = base::Bind(&Ref::Foo, ref);
 //   LOG(INFO) << ref_cb.Run();  // Prints out 3.
 //
 //   By default the object must support RefCounted or you will get a compiler
 //   error. If you're passing between threads, be sure it's
 //   RefCountedThreadSafe! See "Advanced binding of member functions" below if
 //   you don't want to use reference counting.
 //
 // RUNNING A CALLBACK
 //
 //   Callbacks can be run with their "Run" method, which has the same
 //   signature as the template argument to the callback.
 //
 //   void DoSomething(const base::Callback<void(int, std::string)>& callback) {
 //     callback.Run(5, "hello");
 //   }
 //
 //   Callbacks can be run more than once (they don't get deleted or marked when
 //   run). However, this precludes using base::Passed (see below).
 //
 //   void DoSomething(const base::Callback<double(double)>& callback) {
 //     double myresult = callback.Run(3.14159);
 //     myresult += callback.Run(2.71828);
 //   }
 //
 // PASSING UNBOUND INPUT PARAMETERS
 //
 //   Unbound parameters are specified at the time a callback is Run(). They are
 //   specified in the Callback template type:
 //
 //   void MyFunc(int i, const std::string& str) {}
 //   base::Callback<void(int, const std::string&)> cb = base::Bind(&MyFunc);
 //   cb.Run(23, "hello, world");
 //
 // PASSING BOUND INPUT PARAMETERS
 //
 //   Bound parameters are specified when you create thee callback as arguments
 //   to Bind(). They will be passed to the function and the Run()ner of the
 //   callback doesn't see those values or even know that the function it's
 //   calling.
 //
 //   void MyFunc(int i, const std::string& str) {}
 //   base::Callback<void(void)> cb = base::Bind(&MyFunc, 23, "hello world");
 //   cb.Run();
 //
 //   A callback with no unbound input parameters (base::Callback<void(void)>)
 //   is called a base::Closure. So we could have also written:
 //
 //   base::Closure cb = base::Bind(&MyFunc, 23, "hello world");
 //
 //   When calling member functions, bound parameters just go after the object
 //   pointer.
 //
 //   base::Closure cb = base::Bind(&MyClass::MyFunc, this, 23, "hello world");
 //
 // PARTIAL BINDING OF PARAMETERS
 //
 //   You can specify some parameters when you create the callback, and specify
 //   the rest when you execute the callback.
 //
 //   void MyFunc(int i, const std::string& str) {}
 //   base::Callback<void(const std::string&)> cb = base::Bind(&MyFunc, 23);
 //   cb.Run("hello world");
 //
 //   When calling a function bound parameters are first, followed by unbound
 //   parameters.
 //
 //
 // -----------------------------------------------------------------------------
 // Quick reference for advanced binding
 // -----------------------------------------------------------------------------
 //
 // BINDING A CLASS METHOD WITH WEAK POINTERS
 //
 //   base::Bind(&MyClass::Foo, GetWeakPtr());
 //
 //   The callback will not be issued if the object is destroyed at the time
 //   it's issued. DANGER: weak pointers are not threadsafe, so don't use this
 //   when passing between threads!
 //
 // BINDING A CLASS METHOD WITH MANUAL LIFETIME MANAGEMENT
 //
 //   base::Bind(&MyClass::Foo, base::Unretained(this));
 //
 //   This disables all lifetime management on the object. You're responsible
 //   for making sure the object is alive at the time of the call. You break it,
 //   you own it!
 //
 // BINDING A CLASS METHOD AND HAVING THE CALLBACK OWN THE CLASS
 //
 //   MyClass* myclass = new MyClass;
 //   base::Bind(&MyClass::Foo, base::Owned(myclass));
 //
 //   The object will be deleted when the callback is destroyed, even if it's
 //   not run (like if you post a task during shutdown). Potentially useful for
 //   "fire and forget" cases.
 //
 // IGNORING RETURN VALUES
 //
 //   Sometimes you want to call a function that returns a value in a callback
 //   that doesn't expect a return value.
 //
 //   int DoSomething(int arg) { cout << arg << endl; }
 //   base::Callback<void<int>) cb =
 //       base::Bind(base::IgnoreResult(&DoSomething));
 //
 //
 // -----------------------------------------------------------------------------
 // Quick reference for binding parameters to Bind()
 // -----------------------------------------------------------------------------
 //
 // Bound parameters are specified as arguments to Bind() and are passed to the
 // function. A callback with no parameters or no unbound parameters is called a
 // Closure (base::Callback<void(void)> and base::Closure are the same thing).
 //
 // PASSING PARAMETERS OWNED BY THE CALLBACK
 //
 //   void Foo(int* arg) { cout << *arg << endl; }
 //   int* pn = new int(1);
 //   base::Closure foo_callback = base::Bind(&foo, base::Owned(pn));
 //
 //   The parameter will be deleted when the callback is destroyed, even if it's
 //   not run (like if you post a task during shutdown).
 //
 // PASSING PARAMETERS AS A scoped_ptr
 //
 //   void TakesOwnership(scoped_ptr<Foo> arg) {}
 //   scoped_ptr<Foo> f(new Foo);
 //   // f becomes null during the following call.
 //   base::Closure cb = base::Bind(&TakesOwnership, base::Passed(&f));
 //
 //   Ownership of the parameter will be with the callback until the it is run,
 //   when ownership is passed to the callback function. This means the callback
 //   can only be run once. If the callback is never run, it will delete the
 //   object when it's destroyed.
 //
 // PASSING PARAMETERS AS A scoped_refptr
 //
 //   void TakesOneRef(scoped_refptr<Foo> arg) {}
 //   scoped_refptr<Foo> f(new Foo)
 //   base::Closure cb = base::Bind(&TakesOneRef, f);
 //
 //   This should "just work." The closure will take a reference as long as it
 //   is alive, and another reference will be taken for the called function.
 //
 // PASSING PARAMETERS BY REFERENCE
 //
 //   void foo(int arg) { cout << arg << endl }
 //   int n = 1;
 //   base::Closure has_ref = base::Bind(&foo, base::ConstRef(n));
 //   n = 2;
 //   has_ref.Run();  // Prints "2"
 //
 //   Normally parameters are copied in the closure. DANGER: ConstRef stores a
 //   const reference instead, referencing the original parameter. This means
 //   that you must ensure the object outlives the callback!
 //
 //
 // -----------------------------------------------------------------------------
 // Implementation notes
 // -----------------------------------------------------------------------------
 //
 // WHERE IS THIS DESIGN FROM:
 //
 // 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 (e.g., Unretained() and ConstRef()).
 //
 // 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 BindState<>*.  In the context of the constructor,
 // the static type of this BindState<> pointer uniquely identifies the
 // function it is representing, all its bound parameters, and a Run() method
 // that is capable of invoking the target.
 //
 // Callback's constructor takes the BindState<>* that has the full static type
 // and erases the target function type as well as the types of the bound
 // parameters.  It does this by storing a pointer to the specific Run()
 // function, and upcasting the state of BindState<>* to a
 // BindStateBase*. This is safe as long as this BindStateBase pointer
 // is only used with the stored Run() pointer.
 //
 // To BindState<> objects are created inside the Bind() functions.
 // These functions, along with a set of internal templates, are responsible for
 //
 //  - Unwrapping the function signature into return type, and parameters
 //  - Determining the number of parameters that are bound
 //  - Creating the BindState storing the bound parameters
 //  - Performing compile-time asserts to avoid error-prone behavior
 //  - Returning an Callback<> with an arity matching the number of unbound
 //    parameters and that knows the correct refcounting semantics for the
 //    target object if we are binding a method.
 //
 // The Bind functions do the above using type-inference, and template
 // specializations.
 //
 // By default Bind() will store copies of all bound parameters, and attempt
 // to refcount a target object if the function being bound is a class method.
 // These copies are created even if the function takes parameters as const
 // references. (Binding to non-const references is forbidden, see bind.h.)
 //
 // To change this behavior, we introduce a set of argument wrappers
 // (e.g., Unretained(), and ConstRef()).  These are simple container templates
 // that are passed by value, and wrap a pointer to argument.  See the
 // file-level comment in base/bind_helpers.h for more info.
 //
 // These types are passed to the Unwrap() functions, and the MaybeRefcount()
 // functions respectively to modify the behavior of Bind().  The Unwrap()
 // and MaybeRefcount() functions change behavior by doing partial
 // specialization based on whether or not a parameter is a wrapper type.
 //
 // ConstRef() is similar to tr1::cref.  Unretained() is specific to Chromium.
 //
 //
 // WHY NOT TR1 FUNCTION/BIND?
 //
 // Direct use of tr1::function and tr1::bind was considered, but ultimately
 // rejected because of the number of copy constructors invocations involved
 // in the binding of arguments during construction, and the forwarding of
 // arguments during invocation.  These copies will no longer be an issue in
 // C++0x because C++0x will support rvalue reference allowing for the compiler
 // to avoid these copies.  However, waiting for C++0x is not an option.
 //
 // Measured with valgrind on gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5), the
 // tr1::bind call itself will invoke a non-trivial copy constructor three times
 // for each bound parameter.  Also, each when passing a tr1::function, each
 // bound argument will be copied again.
 //
 // In addition to the copies taken at binding and invocation, copying a
 // tr1::function causes a copy to be made of all the bound parameters and
 // state.
 //
 // Furthermore, in Chromium, it is desirable for the Callback to take a
 // reference on a target object when representing a class method call.  This
 // is not supported by tr1.
 //
 // Lastly, tr1::function and tr1::bind has a more general and flexible API.
 // This includes things like argument reordering by use of
 // tr1::bind::placeholder, support for non-const reference parameters, and some
 // limited amount of subtyping of the tr1::function object (e.g.,
 // tr1::function<int(int)> is convertible to tr1::function<void(int)>).
 //
 // These are not features that are required in Chromium. Some of them, such as
 // allowing for reference parameters, and subtyping of functions, may actually
 // become a source of errors. Removing support for these features actually
 // allows for a simpler implementation, and a terser Currying API.
 //
 //
 // WHY NOT GOOGLE CALLBACKS?
 //
 // The Google callback system also does not support refcounting.  Furthermore,
 // its implementation has a number of strange edge cases with respect to type
 // conversion of its arguments.  In particular, the argument's constness must
 // at times match exactly the function signature, or the type-inference might
 // break.  Given the above, writing a custom solution was easier.
 //
 //
 // MISSING FUNCTIONALITY
 //  - Invoking the return of Bind.  Bind(&foo).Run() does not work;
 //  - Binding arrays to functions that take a non-const pointer.
 //    Example:
 //      void Foo(const char* ptr);
 //      void Bar(char* ptr);
 //      Bind(&Foo, "test");
 //      Bind(&Bar, "test");  // This fails because ptr is not const.
 namespace base {
 // First, we forward declare the Callback class template. This informs the
 // compiler that the template only has 1 type parameter which is the function
 // signature that the Callback is representing.
 //
 // After this, create template specializations for 0-7 parameters. Note that
 // even though the template typelist grows, the specialization still
 // only has one type: the function signature.
 //
 // If you are thinking of forward declaring Callback in your own header file,
 // please include "base/callback_forward.h" instead.
 template <typename Sig>
 class Callback;
 namespace internal {
 template <typename Runnable, typename RunType, typename BoundArgsType>
 struct BindState;
 }  // namespace internal
 template <typename R>
 class Callback<R(void)> : public internal::CallbackBase {
  public:
   typedef R(RunType)();
   Callback() : CallbackBase(NULL) { }
   // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
   // return the exact Callback<> type.  See base/bind.h for details.
   template <typename Runnable, typename BindRunType, typename BoundArgsType>
   Callback(internal::BindState<Runnable, BindRunType,
            BoundArgsType>* bind_state)
       : CallbackBase(bind_state) {
     // Force the assignment to a local variable of PolymorphicInvoke
     // so the compiler will typecheck that the passed in Run() method has
     // the correct type.
     PolymorphicInvoke invoke_func =
         &internal::BindState<Runnable, BindRunType, BoundArgsType>
             ::InvokerType::Run;
     polymorphic_invoke_ = reinterpret_cast<InvokeFuncStorage>(invoke_func);
   }
   bool Equals(const Callback& other) const {
     return CallbackBase::Equals(other);
   }
   R Run() const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
     return f(bind_state_.get());
   }
  private:
   typedef R(*PolymorphicInvoke)(
       internal::BindStateBase*);
 };
 template <typename R, typename A1>
 class Callback<R(A1)> : public internal::CallbackBase {
  public:
   typedef R(RunType)(A1);
   Callback() : CallbackBase(NULL) { }
   // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
   // return the exact Callback<> type.  See base/bind.h for details.
   template <typename Runnable, typename BindRunType, typename BoundArgsType>
   Callback(internal::BindState<Runnable, BindRunType,
            BoundArgsType>* bind_state)
       : CallbackBase(bind_state) {
     // Force the assignment to a local variable of PolymorphicInvoke
     // so the compiler will typecheck that the passed in Run() method has
     // the correct type.
     PolymorphicInvoke invoke_func =
         &internal::BindState<Runnable, BindRunType, BoundArgsType>
             ::InvokerType::Run;
     polymorphic_invoke_ = reinterpret_cast<InvokeFuncStorage>(invoke_func);
   }
   bool Equals(const Callback& other) const {
     return CallbackBase::Equals(other);
   }
   R Run(typename internal::CallbackParamTraits<A1>::ForwardType a1) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
     return f(bind_state_.get(), internal::CallbackForward(a1));
   }
  private:
   typedef R(*PolymorphicInvoke)(
       internal::BindStateBase*,
           typename internal::CallbackParamTraits<A1>::ForwardType);
 };
 template <typename R, typename A1, typename A2>
 class Callback<R(A1, A2)> : public internal::CallbackBase {
  public:
   typedef R(RunType)(A1, A2);
   Callback() : CallbackBase(NULL) { }
   // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
   // return the exact Callback<> type.  See base/bind.h for details.
   template <typename Runnable, typename BindRunType, typename BoundArgsType>
   Callback(internal::BindState<Runnable, BindRunType,
            BoundArgsType>* bind_state)
       : CallbackBase(bind_state) {
     // Force the assignment to a local variable of PolymorphicInvoke
     // so the compiler will typecheck that the passed in Run() method has
     // the correct type.
     PolymorphicInvoke invoke_func =
         &internal::BindState<Runnable, BindRunType, BoundArgsType>
             ::InvokerType::Run;
     polymorphic_invoke_ = reinterpret_cast<InvokeFuncStorage>(invoke_func);
   }
   bool Equals(const Callback& other) const {
     return CallbackBase::Equals(other);
   }
   R Run(typename internal::CallbackParamTraits<A1>::ForwardType a1,
         typename internal::CallbackParamTraits<A2>::ForwardType a2) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
     return f(bind_state_.get(), internal::CallbackForward(a1),
              internal::CallbackForward(a2));
   }
  private:
   typedef R(*PolymorphicInvoke)(
       internal::BindStateBase*,
           typename internal::CallbackParamTraits<A1>::ForwardType,
           typename internal::CallbackParamTraits<A2>::ForwardType);
 };
 template <typename R, typename A1, typename A2, typename A3>
 class Callback<R(A1, A2, A3)> : public internal::CallbackBase {
  public:
   typedef R(RunType)(A1, A2, A3);
   Callback() : CallbackBase(NULL) { }
   // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
   // return the exact Callback<> type.  See base/bind.h for details.
   template <typename Runnable, typename BindRunType, typename BoundArgsType>
   Callback(internal::BindState<Runnable, BindRunType,
            BoundArgsType>* bind_state)
       : CallbackBase(bind_state) {
     // Force the assignment to a local variable of PolymorphicInvoke
     // so the compiler will typecheck that the passed in Run() method has
     // the correct type.
     PolymorphicInvoke invoke_func =
         &internal::BindState<Runnable, BindRunType, BoundArgsType>
             ::InvokerType::Run;
     polymorphic_invoke_ = reinterpret_cast<InvokeFuncStorage>(invoke_func);
   }
   bool Equals(const Callback& other) const {
     return CallbackBase::Equals(other);
   }
   R Run(typename internal::CallbackParamTraits<A1>::ForwardType a1,
         typename internal::CallbackParamTraits<A2>::ForwardType a2,
         typename internal::CallbackParamTraits<A3>::ForwardType a3) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
     return f(bind_state_.get(), internal::CallbackForward(a1),
              internal::CallbackForward(a2),
              internal::CallbackForward(a3));
   }
  private:
   typedef R(*PolymorphicInvoke)(
       internal::BindStateBase*,
           typename internal::CallbackParamTraits<A1>::ForwardType,
           typename internal::CallbackParamTraits<A2>::ForwardType,
           typename internal::CallbackParamTraits<A3>::ForwardType);
 };
 template <typename R, typename A1, typename A2, typename A3, typename A4>
 class Callback<R(A1, A2, A3, A4)> : public internal::CallbackBase {
  public:
   typedef R(RunType)(A1, A2, A3, A4);
   Callback() : CallbackBase(NULL) { }
   // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
   // return the exact Callback<> type.  See base/bind.h for details.
   template <typename Runnable, typename BindRunType, typename BoundArgsType>
   Callback(internal::BindState<Runnable, BindRunType,
            BoundArgsType>* bind_state)
       : CallbackBase(bind_state) {
     // Force the assignment to a local variable of PolymorphicInvoke
     // so the compiler will typecheck that the passed in Run() method has
     // the correct type.
     PolymorphicInvoke invoke_func =
         &internal::BindState<Runnable, BindRunType, BoundArgsType>
             ::InvokerType::Run;
     polymorphic_invoke_ = reinterpret_cast<InvokeFuncStorage>(invoke_func);
   }
   bool Equals(const Callback& other) const {
     return CallbackBase::Equals(other);
   }
   R Run(typename internal::CallbackParamTraits<A1>::ForwardType a1,
         typename internal::CallbackParamTraits<A2>::ForwardType a2,
         typename internal::CallbackParamTraits<A3>::ForwardType a3,
         typename internal::CallbackParamTraits<A4>::ForwardType a4) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
     return f(bind_state_.get(), internal::CallbackForward(a1),
              internal::CallbackForward(a2),
              internal::CallbackForward(a3),
              internal::CallbackForward(a4));
   }
  private:
   typedef R(*PolymorphicInvoke)(
       internal::BindStateBase*,
           typename internal::CallbackParamTraits<A1>::ForwardType,
           typename internal::CallbackParamTraits<A2>::ForwardType,
           typename internal::CallbackParamTraits<A3>::ForwardType,
           typename internal::CallbackParamTraits<A4>::ForwardType);
 };
 template <typename R, typename A1, typename A2, typename A3, typename A4,
     typename A5>
 class Callback<R(A1, A2, A3, A4, A5)> : public internal::CallbackBase {
  public:
   typedef R(RunType)(A1, A2, A3, A4, A5);
   Callback() : CallbackBase(NULL) { }
   // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
   // return the exact Callback<> type.  See base/bind.h for details.
   template <typename Runnable, typename BindRunType, typename BoundArgsType>
   Callback(internal::BindState<Runnable, BindRunType,
            BoundArgsType>* bind_state)
       : CallbackBase(bind_state) {
     // Force the assignment to a local variable of PolymorphicInvoke
     // so the compiler will typecheck that the passed in Run() method has
     // the correct type.
     PolymorphicInvoke invoke_func =
         &internal::BindState<Runnable, BindRunType, BoundArgsType>
             ::InvokerType::Run;
     polymorphic_invoke_ = reinterpret_cast<InvokeFuncStorage>(invoke_func);
   }
   bool Equals(const Callback& other) const {
     return CallbackBase::Equals(other);
   }
   R Run(typename internal::CallbackParamTraits<A1>::ForwardType a1,
         typename internal::CallbackParamTraits<A2>::ForwardType a2,
         typename internal::CallbackParamTraits<A3>::ForwardType a3,
         typename internal::CallbackParamTraits<A4>::ForwardType a4,
         typename internal::CallbackParamTraits<A5>::ForwardType a5) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
     return f(bind_state_.get(), internal::CallbackForward(a1),
              internal::CallbackForward(a2),
              internal::CallbackForward(a3),
              internal::CallbackForward(a4),
              internal::CallbackForward(a5));
   }
  private:
   typedef R(*PolymorphicInvoke)(
       internal::BindStateBase*,
           typename internal::CallbackParamTraits<A1>::ForwardType,
           typename internal::CallbackParamTraits<A2>::ForwardType,
           typename internal::CallbackParamTraits<A3>::ForwardType,
           typename internal::CallbackParamTraits<A4>::ForwardType,
           typename internal::CallbackParamTraits<A5>::ForwardType);
 };
 template <typename R, typename A1, typename A2, typename A3, typename A4,
     typename A5, typename A6>
 class Callback<R(A1, A2, A3, A4, A5, A6)> : public internal::CallbackBase {
  public:
   typedef R(RunType)(A1, A2, A3, A4, A5, A6);
   Callback() : CallbackBase(NULL) { }
   // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
   // return the exact Callback<> type.  See base/bind.h for details.
   template <typename Runnable, typename BindRunType, typename BoundArgsType>
   Callback(internal::BindState<Runnable, BindRunType,
            BoundArgsType>* bind_state)
       : CallbackBase(bind_state) {
     // Force the assignment to a local variable of PolymorphicInvoke
     // so the compiler will typecheck that the passed in Run() method has
     // the correct type.
     PolymorphicInvoke invoke_func =
         &internal::BindState<Runnable, BindRunType, BoundArgsType>
             ::InvokerType::Run;
     polymorphic_invoke_ = reinterpret_cast<InvokeFuncStorage>(invoke_func);
   }
   bool Equals(const Callback& other) const {
     return CallbackBase::Equals(other);
   }
   R Run(typename internal::CallbackParamTraits<A1>::ForwardType a1,
         typename internal::CallbackParamTraits<A2>::ForwardType a2,
         typename internal::CallbackParamTraits<A3>::ForwardType a3,
         typename internal::CallbackParamTraits<A4>::ForwardType a4,
         typename internal::CallbackParamTraits<A5>::ForwardType a5,
         typename internal::CallbackParamTraits<A6>::ForwardType a6) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
     return f(bind_state_.get(), internal::CallbackForward(a1),
              internal::CallbackForward(a2),
              internal::CallbackForward(a3),
              internal::CallbackForward(a4),
              internal::CallbackForward(a5),
              internal::CallbackForward(a6));
   }
  private:
   typedef R(*PolymorphicInvoke)(
       internal::BindStateBase*,
           typename internal::CallbackParamTraits<A1>::ForwardType,
           typename internal::CallbackParamTraits<A2>::ForwardType,
           typename internal::CallbackParamTraits<A3>::ForwardType,
           typename internal::CallbackParamTraits<A4>::ForwardType,
           typename internal::CallbackParamTraits<A5>::ForwardType,
           typename internal::CallbackParamTraits<A6>::ForwardType);
 };
 template <typename R, typename A1, typename A2, typename A3, typename A4,
     typename A5, typename A6, typename A7>
 class Callback<R(A1, A2, A3, A4, A5, A6, A7)> : public internal::CallbackBase {
  public:
   typedef R(RunType)(A1, A2, A3, A4, A5, A6, A7);
   Callback() : CallbackBase(NULL) { }
   // Note that this constructor CANNOT be explicit, and that Bind() CANNOT
   // return the exact Callback<> type.  See base/bind.h for details.
   template <typename Runnable, typename BindRunType, typename BoundArgsType>
   Callback(internal::BindState<Runnable, BindRunType,
            BoundArgsType>* bind_state)
       : CallbackBase(bind_state) {
     // Force the assignment to a local variable of PolymorphicInvoke
     // so the compiler will typecheck that the passed in Run() method has
     // the correct type.
     PolymorphicInvoke invoke_func =
         &internal::BindState<Runnable, BindRunType, BoundArgsType>
             ::InvokerType::Run;
     polymorphic_invoke_ = reinterpret_cast<InvokeFuncStorage>(invoke_func);
   }
   bool Equals(const Callback& other) const {
     return CallbackBase::Equals(other);
   }
   R Run(typename internal::CallbackParamTraits<A1>::ForwardType a1,
         typename internal::CallbackParamTraits<A2>::ForwardType a2,
         typename internal::CallbackParamTraits<A3>::ForwardType a3,
         typename internal::CallbackParamTraits<A4>::ForwardType a4,
         typename internal::CallbackParamTraits<A5>::ForwardType a5,
         typename internal::CallbackParamTraits<A6>::ForwardType a6,
         typename internal::CallbackParamTraits<A7>::ForwardType a7) const {
     PolymorphicInvoke f =
         reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);
     return f(bind_state_.get(), internal::CallbackForward(a1),
              internal::CallbackForward(a2),
              internal::CallbackForward(a3),
              internal::CallbackForward(a4),
              internal::CallbackForward(a5),
              internal::CallbackForward(a6),
              internal::CallbackForward(a7));
   }
  private:
   typedef R(*PolymorphicInvoke)(
       internal::BindStateBase*,
           typename internal::CallbackParamTraits<A1>::ForwardType,
           typename internal::CallbackParamTraits<A2>::ForwardType,
           typename internal::CallbackParamTraits<A3>::ForwardType,
           typename internal::CallbackParamTraits<A4>::ForwardType,
           typename internal::CallbackParamTraits<A5>::ForwardType,
           typename internal::CallbackParamTraits<A6>::ForwardType,
           typename internal::CallbackParamTraits<A7>::ForwardType);
 };
 // 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

The Tor Browser / annotate

security/sandbox/chromium/base/callback.h@6474c204b198 (annotated)

security/sandbox/chromium/base/callback.h