gin/function_template.h - chromium/src.git - Git at Google

 // This file was GENERATED by command:
 //     pump.py function_template.h.pump
 // DO NOT EDIT BY HAND!!!


 #ifndef GIN_FUNCTION_TEMPLATE_H_
 #define GIN_FUNCTION_TEMPLATE_H_

 // Copyright 2013 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.

 #include "base/callback.h"
 #include "base/logging.h"
 #include "gin/arguments.h"
 #include "gin/converter.h"
 #include "gin/gin_export.h"
 #include "v8/include/v8.h"

 namespace gin {

 class PerIsolateData;

 enum CreateFunctionTemplateFlags {
   HolderIsFirstArgument = 1 << 0,
 };

 namespace internal {

 template<typename T>
 struct CallbackParamTraits {
   typedef T LocalType;
 };
 template<typename T>
 struct CallbackParamTraits<const T&> {
   typedef T LocalType;
 };
 template<typename T>
 struct CallbackParamTraits<const T*> {
   typedef T* LocalType;
 };


 // CallbackHolder and CallbackHolderBase are used to pass a base::Callback from
 // CreateFunctionTemplate through v8 (via v8::FunctionTemplate) to
 // DispatchToCallback, where it is invoked.

 // This simple base class is used so that we can share a single object template
 // among every CallbackHolder instance.
 class GIN_EXPORT CallbackHolderBase {
  public:
   v8::Handle<v8::External> GetHandle(v8::Isolate* isolate);

  protected:
   explicit CallbackHolderBase(v8::Isolate* isolate);
   virtual ~CallbackHolderBase();

  private:
   static void WeakCallback(
       const v8::WeakCallbackData<v8::External, CallbackHolderBase>& data);

   v8::Persistent<v8::External> v8_ref_;

   DISALLOW_COPY_AND_ASSIGN(CallbackHolderBase);
 };

 template<typename Sig>
 class CallbackHolder : public CallbackHolderBase {
  public:
   CallbackHolder(v8::Isolate* isolate,
                  const base::Callback<Sig>& callback,
                  int flags)
       : CallbackHolderBase(isolate), callback(callback), flags(flags) {}
   base::Callback<Sig> callback;
   int flags;
  private:
   virtual ~CallbackHolder() {}

   DISALLOW_COPY_AND_ASSIGN(CallbackHolder);
 };


 // This set of templates invokes a base::Callback, converts the return type to a
 // JavaScript value, and returns that value to script via the provided
 // gin::Arguments object.
 //
 // In C++, you can declare the function foo(void), but you can't pass a void
 // expression to foo. As a result, we must specialize the case of Callbacks that
 // have the void return type.
 template<typename R, typename P1 = void, typename P2 = void,
     typename P3 = void, typename P4 = void, typename P5 = void,
     typename P6 = void>
 struct Invoker {
   inline static void Go(
       Arguments* args,
       const base::Callback<R(P1, P2, P3, P4, P5, P6)>& callback,
       const P1& a1,
       const P2& a2,
       const P3& a3,
       const P4& a4,
       const P5& a5,
       const P6& a6) {
     args->Return(callback.Run(a1, a2, a3, a4, a5, a6));
   }
 };
 template<typename P1, typename P2, typename P3, typename P4, typename P5,
     typename P6>
 struct Invoker<void, P1, P2, P3, P4, P5, P6> {
   inline static void Go(
       Arguments* args,
       const base::Callback<void(P1, P2, P3, P4, P5, P6)>& callback,
       const P1& a1,
       const P2& a2,
       const P3& a3,
       const P4& a4,
       const P5& a5,
       const P6& a6) {
     callback.Run(a1, a2, a3, a4, a5, a6);
   }
 };

 template<typename R, typename P1, typename P2, typename P3, typename P4,
     typename P5>
 struct Invoker<R, P1, P2, P3, P4, P5, void> {
   inline static void Go(
       Arguments* args,
       const base::Callback<R(P1, P2, P3, P4, P5)>& callback,
       const P1& a1,
       const P2& a2,
       const P3& a3,
       const P4& a4,
       const P5& a5) {
     args->Return(callback.Run(a1, a2, a3, a4, a5));
   }
 };
 template<typename P1, typename P2, typename P3, typename P4, typename P5>
 struct Invoker<void, P1, P2, P3, P4, P5, void> {
   inline static void Go(
       Arguments* args,
       const base::Callback<void(P1, P2, P3, P4, P5)>& callback,
       const P1& a1,
       const P2& a2,
       const P3& a3,
       const P4& a4,
       const P5& a5) {
     callback.Run(a1, a2, a3, a4, a5);
   }
 };

 template<typename R, typename P1, typename P2, typename P3, typename P4>
 struct Invoker<R, P1, P2, P3, P4, void, void> {
   inline static void Go(
       Arguments* args,
       const base::Callback<R(P1, P2, P3, P4)>& callback,
       const P1& a1,
       const P2& a2,
       const P3& a3,
       const P4& a4) {
     args->Return(callback.Run(a1, a2, a3, a4));
   }
 };
 template<typename P1, typename P2, typename P3, typename P4>
 struct Invoker<void, P1, P2, P3, P4, void, void> {
   inline static void Go(
       Arguments* args,
       const base::Callback<void(P1, P2, P3, P4)>& callback,
       const P1& a1,
       const P2& a2,
       const P3& a3,
       const P4& a4) {
     callback.Run(a1, a2, a3, a4);
   }
 };

 template<typename R, typename P1, typename P2, typename P3>
 struct Invoker<R, P1, P2, P3, void, void, void> {
   inline static void Go(
       Arguments* args,
       const base::Callback<R(P1, P2, P3)>& callback,
       const P1& a1,
       const P2& a2,
       const P3& a3) {
     args->Return(callback.Run(a1, a2, a3));
   }
 };
 template<typename P1, typename P2, typename P3>
 struct Invoker<void, P1, P2, P3, void, void, void> {
   inline static void Go(
       Arguments* args,
       const base::Callback<void(P1, P2, P3)>& callback,
       const P1& a1,
       const P2& a2,
       const P3& a3) {
     callback.Run(a1, a2, a3);
   }
 };

 template<typename R, typename P1, typename P2>
 struct Invoker<R, P1, P2, void, void, void, void> {
   inline static void Go(
       Arguments* args,
       const base::Callback<R(P1, P2)>& callback,
       const P1& a1,
       const P2& a2) {
     args->Return(callback.Run(a1, a2));
   }
 };
 template<typename P1, typename P2>
 struct Invoker<void, P1, P2, void, void, void, void> {
   inline static void Go(
       Arguments* args,
       const base::Callback<void(P1, P2)>& callback,
       const P1& a1,
       const P2& a2) {
     callback.Run(a1, a2);
   }
 };

 template<typename R, typename P1>
 struct Invoker<R, P1, void, void, void, void, void> {
   inline static void Go(
       Arguments* args,
       const base::Callback<R(P1)>& callback,
       const P1& a1) {
     args->Return(callback.Run(a1));
   }
 };
 template<typename P1>
 struct Invoker<void, P1, void, void, void, void, void> {
   inline static void Go(
       Arguments* args,
       const base::Callback<void(P1)>& callback,
       const P1& a1) {
     callback.Run(a1);
   }
 };

 template<typename R>
 struct Invoker<R, void, void, void, void, void, void> {
   inline static void Go(
       Arguments* args,
       const base::Callback<R()>& callback) {
     args->Return(callback.Run());
   }
 };
 template<>
 struct Invoker<void, void, void, void, void, void, void> {
   inline static void Go(
       Arguments* args,
       const base::Callback<void()>& callback) {
     callback.Run();
   }
 };


 template<typename T>
 bool GetNextArgument(Arguments* args, int create_flags, bool is_first,
                      T* result) {
   if (is_first && (create_flags & HolderIsFirstArgument) != 0) {
     return args->GetHolder(result);
   } else {
     return args->GetNext(result);
   }
 }

 // For advanced use cases, we allow callers to request the unparsed Arguments
 // object and poke around in it directly.
 inline bool GetNextArgument(Arguments* args, int create_flags, bool is_first,
                             Arguments* result) {
   *result = *args;
   return true;
 }
 inline bool GetNextArgument(Arguments* args, int create_flags, bool is_first,
                             Arguments** result) {
   *result = args;
   return true;
 }

 // It's common for clients to just need the isolate, so we make that easy.
 inline bool GetNextArgument(Arguments* args, int create_flags,
                             bool is_first, v8::Isolate** result) {
   *result = args->isolate();
   return true;
 }


 // DispatchToCallback converts all the JavaScript arguments to C++ types and
 // invokes the base::Callback.
 template<typename Sig>
 struct Dispatcher {
 };

 template<typename R>
 struct Dispatcher<R()> {
   static void DispatchToCallback(
       const v8::FunctionCallbackInfo<v8::Value>& info) {
     Arguments args(info);
     v8::Handle<v8::External> v8_holder;
     CHECK(args.GetData(&v8_holder));
     CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
         v8_holder->Value());

     typedef CallbackHolder<R()> HolderT;
     HolderT* holder = static_cast<HolderT*>(holder_base);

     Invoker<R>::Go(&args, holder->callback);
   }
 };

 template<typename R, typename P1>
 struct Dispatcher<R(P1)> {
   static void DispatchToCallback(
       const v8::FunctionCallbackInfo<v8::Value>& info) {
     Arguments args(info);
     v8::Handle<v8::External> v8_holder;
     CHECK(args.GetData(&v8_holder));
     CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
         v8_holder->Value());

     typedef CallbackHolder<R(P1)> HolderT;
     HolderT* holder = static_cast<HolderT*>(holder_base);

     typename CallbackParamTraits<P1>::LocalType a1;
     if (!GetNextArgument(&args, holder->flags, true, &a1)) {
       args.ThrowError();
       return;
     }

     Invoker<R, P1>::Go(&args, holder->callback, a1);
   }
 };

 template<typename R, typename P1, typename P2>
 struct Dispatcher<R(P1, P2)> {
   static void DispatchToCallback(
       const v8::FunctionCallbackInfo<v8::Value>& info) {
     Arguments args(info);
     v8::Handle<v8::External> v8_holder;
     CHECK(args.GetData(&v8_holder));
     CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
         v8_holder->Value());

     typedef CallbackHolder<R(P1, P2)> HolderT;
     HolderT* holder = static_cast<HolderT*>(holder_base);

     typename CallbackParamTraits<P1>::LocalType a1;
     typename CallbackParamTraits<P2>::LocalType a2;
     if (!GetNextArgument(&args, holder->flags, true, &a1) ||
         !GetNextArgument(&args, holder->flags, false, &a2)) {
       args.ThrowError();
       return;
     }

     Invoker<R, P1, P2>::Go(&args, holder->callback, a1, a2);
   }
 };

 template<typename R, typename P1, typename P2, typename P3>
 struct Dispatcher<R(P1, P2, P3)> {
   static void DispatchToCallback(
       const v8::FunctionCallbackInfo<v8::Value>& info) {
     Arguments args(info);
     v8::Handle<v8::External> v8_holder;
     CHECK(args.GetData(&v8_holder));
     CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
         v8_holder->Value());

     typedef CallbackHolder<R(P1, P2, P3)> HolderT;
     HolderT* holder = static_cast<HolderT*>(holder_base);

     typename CallbackParamTraits<P1>::LocalType a1;
     typename CallbackParamTraits<P2>::LocalType a2;
     typename CallbackParamTraits<P3>::LocalType a3;
     if (!GetNextArgument(&args, holder->flags, true, &a1) ||
         !GetNextArgument(&args, holder->flags, false, &a2) ||
         !GetNextArgument(&args, holder->flags, false, &a3)) {
       args.ThrowError();
       return;
     }

     Invoker<R, P1, P2, P3>::Go(&args, holder->callback, a1, a2, a3);
   }
 };

 template<typename R, typename P1, typename P2, typename P3, typename P4>
 struct Dispatcher<R(P1, P2, P3, P4)> {
   static void DispatchToCallback(
       const v8::FunctionCallbackInfo<v8::Value>& info) {
     Arguments args(info);
     v8::Handle<v8::External> v8_holder;
     CHECK(args.GetData(&v8_holder));
     CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
         v8_holder->Value());

     typedef CallbackHolder<R(P1, P2, P3, P4)> HolderT;
     HolderT* holder = static_cast<HolderT*>(holder_base);

     typename CallbackParamTraits<P1>::LocalType a1;
     typename CallbackParamTraits<P2>::LocalType a2;
     typename CallbackParamTraits<P3>::LocalType a3;
     typename CallbackParamTraits<P4>::LocalType a4;
     if (!GetNextArgument(&args, holder->flags, true, &a1) ||
         !GetNextArgument(&args, holder->flags, false, &a2) ||
         !GetNextArgument(&args, holder->flags, false, &a3) ||
         !GetNextArgument(&args, holder->flags, false, &a4)) {
       args.ThrowError();
       return;
     }

     Invoker<R, P1, P2, P3, P4>::Go(&args, holder->callback, a1, a2, a3, a4);
   }
 };

 template<typename R, typename P1, typename P2, typename P3, typename P4,
     typename P5>
 struct Dispatcher<R(P1, P2, P3, P4, P5)> {
   static void DispatchToCallback(
       const v8::FunctionCallbackInfo<v8::Value>& info) {
     Arguments args(info);
     v8::Handle<v8::External> v8_holder;
     CHECK(args.GetData(&v8_holder));
     CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
         v8_holder->Value());

     typedef CallbackHolder<R(P1, P2, P3, P4, P5)> HolderT;
     HolderT* holder = static_cast<HolderT*>(holder_base);

     typename CallbackParamTraits<P1>::LocalType a1;
     typename CallbackParamTraits<P2>::LocalType a2;
     typename CallbackParamTraits<P3>::LocalType a3;
     typename CallbackParamTraits<P4>::LocalType a4;
     typename CallbackParamTraits<P5>::LocalType a5;
     if (!GetNextArgument(&args, holder->flags, true, &a1) ||
         !GetNextArgument(&args, holder->flags, false, &a2) ||
         !GetNextArgument(&args, holder->flags, false, &a3) ||
         !GetNextArgument(&args, holder->flags, false, &a4) ||
         !GetNextArgument(&args, holder->flags, false, &a5)) {
       args.ThrowError();
       return;
     }

     Invoker<R, P1, P2, P3, P4, P5>::Go(&args, holder->callback, a1, a2, a3, a4,
         a5);
   }
 };

 template<typename R, typename P1, typename P2, typename P3, typename P4,
     typename P5, typename P6>
 struct Dispatcher<R(P1, P2, P3, P4, P5, P6)> {
   static void DispatchToCallback(
       const v8::FunctionCallbackInfo<v8::Value>& info) {
     Arguments args(info);
     v8::Handle<v8::External> v8_holder;
     CHECK(args.GetData(&v8_holder));
     CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
         v8_holder->Value());

     typedef CallbackHolder<R(P1, P2, P3, P4, P5, P6)> HolderT;
     HolderT* holder = static_cast<HolderT*>(holder_base);

     typename CallbackParamTraits<P1>::LocalType a1;
     typename CallbackParamTraits<P2>::LocalType a2;
     typename CallbackParamTraits<P3>::LocalType a3;
     typename CallbackParamTraits<P4>::LocalType a4;
     typename CallbackParamTraits<P5>::LocalType a5;
     typename CallbackParamTraits<P6>::LocalType a6;
     if (!GetNextArgument(&args, holder->flags, true, &a1) ||
         !GetNextArgument(&args, holder->flags, false, &a2) ||
         !GetNextArgument(&args, holder->flags, false, &a3) ||
         !GetNextArgument(&args, holder->flags, false, &a4) ||
         !GetNextArgument(&args, holder->flags, false, &a5) ||
         !GetNextArgument(&args, holder->flags, false, &a6)) {
       args.ThrowError();
       return;
     }

     Invoker<R, P1, P2, P3, P4, P5, P6>::Go(&args, holder->callback, a1, a2, a3,
         a4, a5, a6);
   }
 };

 }  // namespace internal


 // CreateFunctionTemplate creates a v8::FunctionTemplate that will create
 // JavaScript functions that execute a provided C++ function or base::Callback.
 // JavaScript arguments are automatically converted via gin::Converter, as is
 // the return value of the C++ function, if any.
 template<typename Sig>
 v8::Local<v8::FunctionTemplate> CreateFunctionTemplate(
     v8::Isolate* isolate, const base::Callback<Sig> callback,
     int callback_flags = 0) {
   typedef internal::CallbackHolder<Sig> HolderT;
   HolderT* holder = new HolderT(isolate, callback, callback_flags);

   return v8::FunctionTemplate::New(
       isolate,
       &internal::Dispatcher<Sig>::DispatchToCallback,
       ConvertToV8<v8::Handle<v8::External> >(isolate,
                                              holder->GetHandle(isolate)));
 }

 // CreateFunctionHandler installs a CallAsFunction handler on the given
 // object template that forwards to a provided C++ function or base::Callback.
 template<typename Sig>
 void CreateFunctionHandler(v8::Isolate* isolate,
                            v8::Local<v8::ObjectTemplate> tmpl,
                            const base::Callback<Sig> callback,
                            int callback_flags = 0) {
   typedef internal::CallbackHolder<Sig> HolderT;
   HolderT* holder = new HolderT(isolate, callback, callback_flags);
   tmpl->SetCallAsFunctionHandler(&internal::Dispatcher<Sig>::DispatchToCallback,
                                  ConvertToV8<v8::Handle<v8::External> >(
                                      isolate, holder->GetHandle(isolate)));
 }

 }  // namespace gin

 #endif  // GIN_FUNCTION_TEMPLATE_H_
	// This file was GENERATED by command:
	// pump.py function_template.h.pump
	// DO NOT EDIT BY HAND!!!



	#ifndef GIN_FUNCTION_TEMPLATE_H_
	#define GIN_FUNCTION_TEMPLATE_H_

	// Copyright 2013 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.

	#include "base/callback.h"
	#include "base/logging.h"
	#include "gin/arguments.h"
	#include "gin/converter.h"
	#include "gin/gin_export.h"
	#include "v8/include/v8.h"

	namespace gin {

	class PerIsolateData;

	enum CreateFunctionTemplateFlags {
	HolderIsFirstArgument = 1 << 0,
	};

	namespace internal {

	template<typename T>
	struct CallbackParamTraits {
	typedef T LocalType;
	};
	template<typename T>
	struct CallbackParamTraits<const T&> {
	typedef T LocalType;
	};
	template<typename T>
	struct CallbackParamTraits<const T*> {
	typedef T* LocalType;
	};


	// CallbackHolder and CallbackHolderBase are used to pass a base::Callback from
	// CreateFunctionTemplate through v8 (via v8::FunctionTemplate) to
	// DispatchToCallback, where it is invoked.

	// This simple base class is used so that we can share a single object template
	// among every CallbackHolder instance.
	class GIN_EXPORT CallbackHolderBase {
	public:
	v8::Handle<v8::External> GetHandle(v8::Isolate* isolate);

	protected:
	explicit CallbackHolderBase(v8::Isolate* isolate);
	virtual ~CallbackHolderBase();

	private:
	static void WeakCallback(
	const v8::WeakCallbackData<v8::External, CallbackHolderBase>& data);

	v8::Persistent<v8::External> v8_ref_;

	DISALLOW_COPY_AND_ASSIGN(CallbackHolderBase);
	};

	template<typename Sig>
	class CallbackHolder : public CallbackHolderBase {
	public:
	CallbackHolder(v8::Isolate* isolate,
	const base::Callback<Sig>& callback,
	int flags)
	: CallbackHolderBase(isolate), callback(callback), flags(flags) {}
	base::Callback<Sig> callback;
	int flags;
	private:
	virtual ~CallbackHolder() {}

	DISALLOW_COPY_AND_ASSIGN(CallbackHolder);
	};


	// This set of templates invokes a base::Callback, converts the return type to a
	// JavaScript value, and returns that value to script via the provided
	// gin::Arguments object.
	//
	// In C++, you can declare the function foo(void), but you can't pass a void
	// expression to foo. As a result, we must specialize the case of Callbacks that
	// have the void return type.
	template<typename R, typename P1 = void, typename P2 = void,
	typename P3 = void, typename P4 = void, typename P5 = void,
	typename P6 = void>
	struct Invoker {
	inline static void Go(
	Arguments* args,
	const base::Callback<R(P1, P2, P3, P4, P5, P6)>& callback,
	const P1& a1,
	const P2& a2,
	const P3& a3,
	const P4& a4,
	const P5& a5,
	const P6& a6) {
	args->Return(callback.Run(a1, a2, a3, a4, a5, a6));
	}
	};
	template<typename P1, typename P2, typename P3, typename P4, typename P5,
	typename P6>
	struct Invoker<void, P1, P2, P3, P4, P5, P6> {
	inline static void Go(
	Arguments* args,
	const base::Callback<void(P1, P2, P3, P4, P5, P6)>& callback,
	const P1& a1,
	const P2& a2,
	const P3& a3,
	const P4& a4,
	const P5& a5,
	const P6& a6) {
	callback.Run(a1, a2, a3, a4, a5, a6);
	}
	};

	template<typename R, typename P1, typename P2, typename P3, typename P4,
	typename P5>
	struct Invoker<R, P1, P2, P3, P4, P5, void> {
	inline static void Go(
	Arguments* args,
	const base::Callback<R(P1, P2, P3, P4, P5)>& callback,
	const P1& a1,
	const P2& a2,
	const P3& a3,
	const P4& a4,
	const P5& a5) {
	args->Return(callback.Run(a1, a2, a3, a4, a5));
	}
	};
	template<typename P1, typename P2, typename P3, typename P4, typename P5>
	struct Invoker<void, P1, P2, P3, P4, P5, void> {
	inline static void Go(
	Arguments* args,
	const base::Callback<void(P1, P2, P3, P4, P5)>& callback,
	const P1& a1,
	const P2& a2,
	const P3& a3,
	const P4& a4,
	const P5& a5) {
	callback.Run(a1, a2, a3, a4, a5);
	}
	};

	template<typename R, typename P1, typename P2, typename P3, typename P4>
	struct Invoker<R, P1, P2, P3, P4, void, void> {
	inline static void Go(
	Arguments* args,
	const base::Callback<R(P1, P2, P3, P4)>& callback,
	const P1& a1,
	const P2& a2,
	const P3& a3,
	const P4& a4) {
	args->Return(callback.Run(a1, a2, a3, a4));
	}
	};
	template<typename P1, typename P2, typename P3, typename P4>
	struct Invoker<void, P1, P2, P3, P4, void, void> {
	inline static void Go(
	Arguments* args,
	const base::Callback<void(P1, P2, P3, P4)>& callback,
	const P1& a1,
	const P2& a2,
	const P3& a3,
	const P4& a4) {
	callback.Run(a1, a2, a3, a4);
	}
	};

	template<typename R, typename P1, typename P2, typename P3>
	struct Invoker<R, P1, P2, P3, void, void, void> {
	inline static void Go(
	Arguments* args,
	const base::Callback<R(P1, P2, P3)>& callback,
	const P1& a1,
	const P2& a2,
	const P3& a3) {
	args->Return(callback.Run(a1, a2, a3));
	}
	};
	template<typename P1, typename P2, typename P3>
	struct Invoker<void, P1, P2, P3, void, void, void> {
	inline static void Go(
	Arguments* args,
	const base::Callback<void(P1, P2, P3)>& callback,
	const P1& a1,
	const P2& a2,
	const P3& a3) {
	callback.Run(a1, a2, a3);
	}
	};

	template<typename R, typename P1, typename P2>
	struct Invoker<R, P1, P2, void, void, void, void> {
	inline static void Go(
	Arguments* args,
	const base::Callback<R(P1, P2)>& callback,
	const P1& a1,
	const P2& a2) {
	args->Return(callback.Run(a1, a2));
	}
	};
	template<typename P1, typename P2>
	struct Invoker<void, P1, P2, void, void, void, void> {
	inline static void Go(
	Arguments* args,
	const base::Callback<void(P1, P2)>& callback,
	const P1& a1,
	const P2& a2) {
	callback.Run(a1, a2);
	}
	};

	template<typename R, typename P1>
	struct Invoker<R, P1, void, void, void, void, void> {
	inline static void Go(
	Arguments* args,
	const base::Callback<R(P1)>& callback,
	const P1& a1) {
	args->Return(callback.Run(a1));
	}
	};
	template<typename P1>
	struct Invoker<void, P1, void, void, void, void, void> {
	inline static void Go(
	Arguments* args,
	const base::Callback<void(P1)>& callback,
	const P1& a1) {
	callback.Run(a1);
	}
	};

	template<typename R>
	struct Invoker<R, void, void, void, void, void, void> {
	inline static void Go(
	Arguments* args,
	const base::Callback<R()>& callback) {
	args->Return(callback.Run());
	}
	};
	template<>
	struct Invoker<void, void, void, void, void, void, void> {
	inline static void Go(
	Arguments* args,
	const base::Callback<void()>& callback) {
	callback.Run();
	}
	};


	template<typename T>
	bool GetNextArgument(Arguments* args, int create_flags, bool is_first,
	T* result) {
	if (is_first && (create_flags & HolderIsFirstArgument) != 0) {
	return args->GetHolder(result);
	} else {
	return args->GetNext(result);
	}
	}

	// For advanced use cases, we allow callers to request the unparsed Arguments
	// object and poke around in it directly.
	inline bool GetNextArgument(Arguments* args, int create_flags, bool is_first,
	Arguments* result) {
	result = args;
	return true;
	}
	inline bool GetNextArgument(Arguments* args, int create_flags, bool is_first,
	Arguments** result) {
	*result = args;
	return true;
	}

	// It's common for clients to just need the isolate, so we make that easy.
	inline bool GetNextArgument(Arguments* args, int create_flags,
	bool is_first, v8::Isolate** result) {
	*result = args->isolate();
	return true;
	}


	// DispatchToCallback converts all the JavaScript arguments to C++ types and
	// invokes the base::Callback.
	template<typename Sig>
	struct Dispatcher {
	};

	template<typename R>
	struct Dispatcher<R()> {
	static void DispatchToCallback(
	const v8::FunctionCallbackInfo<v8::Value>& info) {
	Arguments args(info);
	v8::Handle<v8::External> v8_holder;
	CHECK(args.GetData(&v8_holder));
	CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
	v8_holder->Value());

	typedef CallbackHolder<R()> HolderT;
	HolderT* holder = static_cast<HolderT*>(holder_base);

	Invoker<R>::Go(&args, holder->callback);
	}
	};

	template<typename R, typename P1>
	struct Dispatcher<R(P1)> {
	static void DispatchToCallback(
	const v8::FunctionCallbackInfo<v8::Value>& info) {
	Arguments args(info);
	v8::Handle<v8::External> v8_holder;
	CHECK(args.GetData(&v8_holder));
	CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
	v8_holder->Value());

	typedef CallbackHolder<R(P1)> HolderT;
	HolderT* holder = static_cast<HolderT*>(holder_base);

	typename CallbackParamTraits<P1>::LocalType a1;
	if (!GetNextArgument(&args, holder->flags, true, &a1)) {
	args.ThrowError();
	return;
	}

	Invoker<R, P1>::Go(&args, holder->callback, a1);
	}
	};

	template<typename R, typename P1, typename P2>
	struct Dispatcher<R(P1, P2)> {
	static void DispatchToCallback(
	const v8::FunctionCallbackInfo<v8::Value>& info) {
	Arguments args(info);
	v8::Handle<v8::External> v8_holder;
	CHECK(args.GetData(&v8_holder));
	CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
	v8_holder->Value());

	typedef CallbackHolder<R(P1, P2)> HolderT;
	HolderT* holder = static_cast<HolderT*>(holder_base);

	typename CallbackParamTraits<P1>::LocalType a1;
	typename CallbackParamTraits<P2>::LocalType a2;
	if (!GetNextArgument(&args, holder->flags, true, &a1) \|\|
	!GetNextArgument(&args, holder->flags, false, &a2)) {
	args.ThrowError();
	return;
	}

	Invoker<R, P1, P2>::Go(&args, holder->callback, a1, a2);
	}
	};

	template<typename R, typename P1, typename P2, typename P3>
	struct Dispatcher<R(P1, P2, P3)> {
	static void DispatchToCallback(
	const v8::FunctionCallbackInfo<v8::Value>& info) {
	Arguments args(info);
	v8::Handle<v8::External> v8_holder;
	CHECK(args.GetData(&v8_holder));
	CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
	v8_holder->Value());

	typedef CallbackHolder<R(P1, P2, P3)> HolderT;
	HolderT* holder = static_cast<HolderT*>(holder_base);

	typename CallbackParamTraits<P1>::LocalType a1;
	typename CallbackParamTraits<P2>::LocalType a2;
	typename CallbackParamTraits<P3>::LocalType a3;
	if (!GetNextArgument(&args, holder->flags, true, &a1) \|\|
	!GetNextArgument(&args, holder->flags, false, &a2) \|\|
	!GetNextArgument(&args, holder->flags, false, &a3)) {
	args.ThrowError();
	return;
	}

	Invoker<R, P1, P2, P3>::Go(&args, holder->callback, a1, a2, a3);
	}
	};

	template<typename R, typename P1, typename P2, typename P3, typename P4>
	struct Dispatcher<R(P1, P2, P3, P4)> {
	static void DispatchToCallback(
	const v8::FunctionCallbackInfo<v8::Value>& info) {
	Arguments args(info);
	v8::Handle<v8::External> v8_holder;
	CHECK(args.GetData(&v8_holder));
	CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
	v8_holder->Value());

	typedef CallbackHolder<R(P1, P2, P3, P4)> HolderT;
	HolderT* holder = static_cast<HolderT*>(holder_base);

	typename CallbackParamTraits<P1>::LocalType a1;
	typename CallbackParamTraits<P2>::LocalType a2;
	typename CallbackParamTraits<P3>::LocalType a3;
	typename CallbackParamTraits<P4>::LocalType a4;
	if (!GetNextArgument(&args, holder->flags, true, &a1) \|\|
	!GetNextArgument(&args, holder->flags, false, &a2) \|\|
	!GetNextArgument(&args, holder->flags, false, &a3) \|\|
	!GetNextArgument(&args, holder->flags, false, &a4)) {
	args.ThrowError();
	return;
	}

	Invoker<R, P1, P2, P3, P4>::Go(&args, holder->callback, a1, a2, a3, a4);
	}
	};

	template<typename R, typename P1, typename P2, typename P3, typename P4,
	typename P5>
	struct Dispatcher<R(P1, P2, P3, P4, P5)> {
	static void DispatchToCallback(
	const v8::FunctionCallbackInfo<v8::Value>& info) {
	Arguments args(info);
	v8::Handle<v8::External> v8_holder;
	CHECK(args.GetData(&v8_holder));
	CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
	v8_holder->Value());

	typedef CallbackHolder<R(P1, P2, P3, P4, P5)> HolderT;
	HolderT* holder = static_cast<HolderT*>(holder_base);

	typename CallbackParamTraits<P1>::LocalType a1;
	typename CallbackParamTraits<P2>::LocalType a2;
	typename CallbackParamTraits<P3>::LocalType a3;
	typename CallbackParamTraits<P4>::LocalType a4;
	typename CallbackParamTraits<P5>::LocalType a5;
	if (!GetNextArgument(&args, holder->flags, true, &a1) \|\|
	!GetNextArgument(&args, holder->flags, false, &a2) \|\|
	!GetNextArgument(&args, holder->flags, false, &a3) \|\|
	!GetNextArgument(&args, holder->flags, false, &a4) \|\|
	!GetNextArgument(&args, holder->flags, false, &a5)) {
	args.ThrowError();
	return;
	}

	Invoker<R, P1, P2, P3, P4, P5>::Go(&args, holder->callback, a1, a2, a3, a4,
	a5);
	}
	};

	template<typename R, typename P1, typename P2, typename P3, typename P4,
	typename P5, typename P6>
	struct Dispatcher<R(P1, P2, P3, P4, P5, P6)> {
	static void DispatchToCallback(
	const v8::FunctionCallbackInfo<v8::Value>& info) {
	Arguments args(info);
	v8::Handle<v8::External> v8_holder;
	CHECK(args.GetData(&v8_holder));
	CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
	v8_holder->Value());

	typedef CallbackHolder<R(P1, P2, P3, P4, P5, P6)> HolderT;
	HolderT* holder = static_cast<HolderT*>(holder_base);

	typename CallbackParamTraits<P1>::LocalType a1;
	typename CallbackParamTraits<P2>::LocalType a2;
	typename CallbackParamTraits<P3>::LocalType a3;
	typename CallbackParamTraits<P4>::LocalType a4;
	typename CallbackParamTraits<P5>::LocalType a5;
	typename CallbackParamTraits<P6>::LocalType a6;
	if (!GetNextArgument(&args, holder->flags, true, &a1) \|\|
	!GetNextArgument(&args, holder->flags, false, &a2) \|\|
	!GetNextArgument(&args, holder->flags, false, &a3) \|\|
	!GetNextArgument(&args, holder->flags, false, &a4) \|\|
	!GetNextArgument(&args, holder->flags, false, &a5) \|\|
	!GetNextArgument(&args, holder->flags, false, &a6)) {
	args.ThrowError();
	return;
	}

	Invoker<R, P1, P2, P3, P4, P5, P6>::Go(&args, holder->callback, a1, a2, a3,
	a4, a5, a6);
	}
	};

	} // namespace internal


	// CreateFunctionTemplate creates a v8::FunctionTemplate that will create
	// JavaScript functions that execute a provided C++ function or base::Callback.
	// JavaScript arguments are automatically converted via gin::Converter, as is
	// the return value of the C++ function, if any.
	template<typename Sig>
	v8::Local<v8::FunctionTemplate> CreateFunctionTemplate(
	v8::Isolate* isolate, const base::Callback<Sig> callback,
	int callback_flags = 0) {
	typedef internal::CallbackHolder<Sig> HolderT;
	HolderT* holder = new HolderT(isolate, callback, callback_flags);

	return v8::FunctionTemplate::New(
	isolate,
	&internal::Dispatcher<Sig>::DispatchToCallback,
	ConvertToV8<v8::Handle<v8::External> >(isolate,
	holder->GetHandle(isolate)));
	}

	// CreateFunctionHandler installs a CallAsFunction handler on the given
	// object template that forwards to a provided C++ function or base::Callback.
	template<typename Sig>
	void CreateFunctionHandler(v8::Isolate* isolate,
	v8::Local<v8::ObjectTemplate> tmpl,
	const base::Callback<Sig> callback,
	int callback_flags = 0) {
	typedef internal::CallbackHolder<Sig> HolderT;
	HolderT* holder = new HolderT(isolate, callback, callback_flags);
	tmpl->SetCallAsFunctionHandler(&internal::Dispatcher<Sig>::DispatchToCallback,
	ConvertToV8<v8::Handle<v8::External> >(
	isolate, holder->GetHandle(isolate)));
	}

	} // namespace gin

	#endif // GIN_FUNCTION_TEMPLATE_H_