cefpython/src/include/base/cef_callback.h at cefpython66 · cdreide/cefpython

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// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

// * Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

// * Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

// * Neither the name of Google Inc. nor the name Chromium Embedded

// Framework nor the names of its contributors may be used to endorse

// or promote products derived from this software without specific prior

// written permission.

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef CEF_INCLUDE_BASE_CEF_CALLBACK_H_

#define CEF_INCLUDE_BASE_CEF_CALLBACK_H_

#pragma once

#if defined(BASE_CALLBACK_H_)

// Do nothing if the Chromium header has already been included.

// This can happen in cases where Chromium code is used directly by the

// client application. When using Chromium code directly always include

// the Chromium header first to avoid type conflicts.

#elif defined(USING_CHROMIUM_INCLUDES)

// When building CEF include the Chromium header directly.

#include "base/callback.h"

#else // !USING_CHROMIUM_INCLUDES

// The following is substantially similar to the Chromium implementation.

// If the Chromium implementation diverges the below implementation should be

// updated to match.

#include "include/base/cef_callback_forward.h"

#include "include/base/cef_template_util.h"

#include "include/base/internal/cef_callback_internal.h"

// NOTE: Header files that do not require the full definition of Callback or

// Closure should #include "base/cef_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 run if the object has already been destroyed.

// 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

// Const references are *copied* unless ConstRef is used. Example:

// void foo(const int& arg) { printf("%d %p\n", arg, &arg); }

// int n = 1;

// base::Closure has_copy = base::Bind(&foo, n);

// base::Closure has_ref = base::Bind(&foo, base::ConstRef(n));

// n = 2;

// foo(n); // Prints "2 0xaaaaaaaaaaaa"

// has_copy.Run(); // Prints "1 0xbbbbbbbbbbbb"

// has_ref.Run(); // Prints "2 0xaaaaaaaaaaaa"

// 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 cef_internal {

template <typename Runnable, typename RunType, typename BoundArgsType>

struct BindState;

} // namespace cef_internal

template <typename R>

class Callback<R(void)> : public cef_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(

cef_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 =

&cef_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)(cef_internal::BindStateBase*);

};

template <typename R, typename A1>

class Callback<R(A1)> : public cef_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(

cef_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 =

&cef_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 cef_internal::CallbackParamTraits<A1>::ForwardType a1) const {

PolymorphicInvoke f =

reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);

return f(bind_state_.get(), cef_internal::CallbackForward(a1));

}

private:

typedef R (*PolymorphicInvoke)(

cef_internal::BindStateBase*,

typename cef_internal::CallbackParamTraits<A1>::ForwardType);

};

template <typename R, typename A1, typename A2>

class Callback<R(A1, A2)> : public cef_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(

cef_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 =

&cef_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 cef_internal::CallbackParamTraits<A1>::ForwardType a1,

typename cef_internal::CallbackParamTraits<A2>::ForwardType a2) const {

PolymorphicInvoke f =

reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);

return f(bind_state_.get(), cef_internal::CallbackForward(a1),

cef_internal::CallbackForward(a2));

}

private:

typedef R (*PolymorphicInvoke)(

cef_internal::BindStateBase*,

typename cef_internal::CallbackParamTraits<A1>::ForwardType,

typename cef_internal::CallbackParamTraits<A2>::ForwardType);

};

template <typename R, typename A1, typename A2, typename A3>

class Callback<R(A1, A2, A3)> : public cef_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(

cef_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 =

&cef_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 cef_internal::CallbackParamTraits<A1>::ForwardType a1,

typename cef_internal::CallbackParamTraits<A2>::ForwardType a2,

typename cef_internal::CallbackParamTraits<A3>::ForwardType a3) const {

PolymorphicInvoke f =

reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);

return f(bind_state_.get(), cef_internal::CallbackForward(a1),

cef_internal::CallbackForward(a2),

cef_internal::CallbackForward(a3));

}

private:

typedef R (*PolymorphicInvoke)(

cef_internal::BindStateBase*,

typename cef_internal::CallbackParamTraits<A1>::ForwardType,

typename cef_internal::CallbackParamTraits<A2>::ForwardType,

typename cef_internal::CallbackParamTraits<A3>::ForwardType);

};

template <typename R, typename A1, typename A2, typename A3, typename A4>

class Callback<R(A1, A2, A3, A4)> : public cef_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(

cef_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 =

&cef_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 cef_internal::CallbackParamTraits<A1>::ForwardType a1,

typename cef_internal::CallbackParamTraits<A2>::ForwardType a2,

typename cef_internal::CallbackParamTraits<A3>::ForwardType a3,

typename cef_internal::CallbackParamTraits<A4>::ForwardType a4) const {

PolymorphicInvoke f =

reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);

return f(bind_state_.get(), cef_internal::CallbackForward(a1),

cef_internal::CallbackForward(a2),

cef_internal::CallbackForward(a3),

cef_internal::CallbackForward(a4));

}

private:

typedef R (*PolymorphicInvoke)(

cef_internal::BindStateBase*,

typename cef_internal::CallbackParamTraits<A1>::ForwardType,

typename cef_internal::CallbackParamTraits<A2>::ForwardType,

typename cef_internal::CallbackParamTraits<A3>::ForwardType,

typename cef_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 cef_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(

cef_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 =

&cef_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 cef_internal::CallbackParamTraits<A1>::ForwardType a1,

typename cef_internal::CallbackParamTraits<A2>::ForwardType a2,

typename cef_internal::CallbackParamTraits<A3>::ForwardType a3,

typename cef_internal::CallbackParamTraits<A4>::ForwardType a4,

typename cef_internal::CallbackParamTraits<A5>::ForwardType a5) const {

PolymorphicInvoke f =

reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);

return f(

bind_state_.get(), cef_internal::CallbackForward(a1),

cef_internal::CallbackForward(a2), cef_internal::CallbackForward(a3),

cef_internal::CallbackForward(a4), cef_internal::CallbackForward(a5));

}

private:

typedef R (*PolymorphicInvoke)(

cef_internal::BindStateBase*,

typename cef_internal::CallbackParamTraits<A1>::ForwardType,

typename cef_internal::CallbackParamTraits<A2>::ForwardType,

typename cef_internal::CallbackParamTraits<A3>::ForwardType,

typename cef_internal::CallbackParamTraits<A4>::ForwardType,

typename cef_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 cef_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(

cef_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 =

&cef_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 cef_internal::CallbackParamTraits<A1>::ForwardType a1,

typename cef_internal::CallbackParamTraits<A2>::ForwardType a2,

typename cef_internal::CallbackParamTraits<A3>::ForwardType a3,

typename cef_internal::CallbackParamTraits<A4>::ForwardType a4,

typename cef_internal::CallbackParamTraits<A5>::ForwardType a5,

typename cef_internal::CallbackParamTraits<A6>::ForwardType a6) const {

PolymorphicInvoke f =

reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);

return f(

bind_state_.get(), cef_internal::CallbackForward(a1),

cef_internal::CallbackForward(a2), cef_internal::CallbackForward(a3),

cef_internal::CallbackForward(a4), cef_internal::CallbackForward(a5),

cef_internal::CallbackForward(a6));

}

private:

typedef R (*PolymorphicInvoke)(

cef_internal::BindStateBase*,

typename cef_internal::CallbackParamTraits<A1>::ForwardType,

typename cef_internal::CallbackParamTraits<A2>::ForwardType,

typename cef_internal::CallbackParamTraits<A3>::ForwardType,

typename cef_internal::CallbackParamTraits<A4>::ForwardType,

typename cef_internal::CallbackParamTraits<A5>::ForwardType,

typename cef_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 cef_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(

cef_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 =

&cef_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 cef_internal::CallbackParamTraits<A1>::ForwardType a1,

typename cef_internal::CallbackParamTraits<A2>::ForwardType a2,

typename cef_internal::CallbackParamTraits<A3>::ForwardType a3,

typename cef_internal::CallbackParamTraits<A4>::ForwardType a4,

typename cef_internal::CallbackParamTraits<A5>::ForwardType a5,

typename cef_internal::CallbackParamTraits<A6>::ForwardType a6,

typename cef_internal::CallbackParamTraits<A7>::ForwardType a7) const {

PolymorphicInvoke f =

reinterpret_cast<PolymorphicInvoke>(polymorphic_invoke_);

return f(

bind_state_.get(), cef_internal::CallbackForward(a1),

cef_internal::CallbackForward(a2), cef_internal::CallbackForward(a3),

cef_internal::CallbackForward(a4), cef_internal::CallbackForward(a5),

cef_internal::CallbackForward(a6), cef_internal::CallbackForward(a7));

}

private:

typedef R (*PolymorphicInvoke)(

cef_internal::BindStateBase*,

typename cef_internal::CallbackParamTraits<A1>::ForwardType,

typename cef_internal::CallbackParamTraits<A2>::ForwardType,

typename cef_internal::CallbackParamTraits<A3>::ForwardType,

typename cef_internal::CallbackParamTraits<A4>::ForwardType,

typename cef_internal::CallbackParamTraits<A5>::ForwardType,

typename cef_internal::CallbackParamTraits<A6>::ForwardType,

typename cef_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 // !USING_CHROMIUM_INCLUDES

#endif // CEF_INCLUDE_BASE_CEF_CALLBACK_H_

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