499 строки
16 KiB
C++
499 строки
16 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE.chromium file.
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#ifndef NATIVE_MATE_FUNCTION_TEMPLATE_H_
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#define NATIVE_MATE_FUNCTION_TEMPLATE_H_
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#include "base/callback.h"
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#include "base/logging.h"
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#include "native_mate/arguments.h"
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#include "native_mate/converter.h"
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#include "v8/include/v8.h"
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namespace mate {
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class PerIsolateData;
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enum CreateFunctionTemplateFlags {
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HolderIsFirstArgument = 1 << 0,
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};
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namespace internal {
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template<typename T>
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struct CallbackParamTraits {
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typedef T LocalType;
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};
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template<typename T>
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struct CallbackParamTraits<const T&> {
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typedef T LocalType;
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};
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template<typename T>
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struct CallbackParamTraits<const T*> {
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typedef T* LocalType;
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};
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// CallbackHolder and CallbackHolderBase are used to pass a base::Callback from
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// CreateFunctionTemplate through v8 (via v8::FunctionTemplate) to
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// DispatchToCallback, where it is invoked.
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// This simple base class is used so that we can share a single object template
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// among every CallbackHolder instance.
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class CallbackHolderBase {
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public:
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v8::Handle<v8::External> GetHandle(v8::Isolate* isolate);
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protected:
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explicit CallbackHolderBase(v8::Isolate* isolate);
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virtual ~CallbackHolderBase();
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private:
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static MATE_WEAK_CALLBACK(WeakCallback, v8::External, CallbackHolderBase);
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v8::Persistent<v8::External> v8_ref_;
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DISALLOW_COPY_AND_ASSIGN(CallbackHolderBase);
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};
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template<typename Sig>
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class CallbackHolder : public CallbackHolderBase {
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public:
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CallbackHolder(v8::Isolate* isolate,
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const base::Callback<Sig>& callback,
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int flags)
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: CallbackHolderBase(isolate), callback(callback), flags(flags) {}
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base::Callback<Sig> callback;
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int flags;
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private:
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virtual ~CallbackHolder() {}
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DISALLOW_COPY_AND_ASSIGN(CallbackHolder);
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};
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// This set of templates invokes a base::Callback, converts the return type to a
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// JavaScript value, and returns that value to script via the provided
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// mate::Arguments object.
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//
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// In C++, you can declare the function foo(void), but you can't pass a void
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// expression to foo. As a result, we must specialize the case of Callbacks that
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// have the void return type.
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template<typename R, typename P1 = void, typename P2 = void,
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typename P3 = void, typename P4 = void, typename P5 = void,
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typename P6 = void>
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struct Invoker {
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inline static MATE_METHOD_RETURN_TYPE Go(
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Arguments& args,
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const base::Callback<R(P1, P2, P3, P4, P5, P6)>& callback,
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const P1& a1,
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const P2& a2,
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const P3& a3,
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const P4& a4,
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const P5& a5,
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const P6& a6) {
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MATE_METHOD_RETURN(callback.Run(a1, a2, a3, a4, a5, a6));
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}
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};
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template<typename P1, typename P2, typename P3, typename P4, typename P5,
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typename P6>
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struct Invoker<void, P1, P2, P3, P4, P5, P6> {
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inline static MATE_METHOD_RETURN_TYPE Go(
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Arguments& args,
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const base::Callback<void(P1, P2, P3, P4, P5, P6)>& callback,
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const P1& a1,
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const P2& a2,
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const P3& a3,
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const P4& a4,
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const P5& a5,
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const P6& a6) {
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callback.Run(a1, a2, a3, a4, a5, a6);
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MATE_METHOD_RETURN_UNDEFINED();
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}
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};
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template<typename R, typename P1, typename P2, typename P3, typename P4,
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typename P5>
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struct Invoker<R, P1, P2, P3, P4, P5, void> {
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inline static MATE_METHOD_RETURN_TYPE Go(
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Arguments& args,
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const base::Callback<R(P1, P2, P3, P4, P5)>& callback,
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const P1& a1,
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const P2& a2,
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const P3& a3,
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const P4& a4,
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const P5& a5) {
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MATE_METHOD_RETURN(callback.Run(a1, a2, a3, a4, a5));
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}
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};
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template<typename P1, typename P2, typename P3, typename P4, typename P5>
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struct Invoker<void, P1, P2, P3, P4, P5, void> {
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inline static MATE_METHOD_RETURN_TYPE Go(
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Arguments& args,
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const base::Callback<void(P1, P2, P3, P4, P5)>& callback,
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const P1& a1,
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const P2& a2,
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const P3& a3,
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const P4& a4,
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const P5& a5) {
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callback.Run(a1, a2, a3, a4, a5);
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MATE_METHOD_RETURN_UNDEFINED();
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}
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};
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template<typename R, typename P1, typename P2, typename P3, typename P4>
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struct Invoker<R, P1, P2, P3, P4, void, void> {
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inline static MATE_METHOD_RETURN_TYPE Go(
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Arguments& args,
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const base::Callback<R(P1, P2, P3, P4)>& callback,
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const P1& a1,
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const P2& a2,
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const P3& a3,
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const P4& a4) {
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MATE_METHOD_RETURN(callback.Run(a1, a2, a3, a4));
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}
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};
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template<typename P1, typename P2, typename P3, typename P4>
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struct Invoker<void, P1, P2, P3, P4, void, void> {
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inline static MATE_METHOD_RETURN_TYPE Go(
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Arguments& args,
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const base::Callback<void(P1, P2, P3, P4)>& callback,
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const P1& a1,
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const P2& a2,
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const P3& a3,
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const P4& a4) {
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callback.Run(a1, a2, a3, a4);
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MATE_METHOD_RETURN_UNDEFINED();
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}
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};
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template<typename R, typename P1, typename P2, typename P3>
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struct Invoker<R, P1, P2, P3, void, void, void> {
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inline static MATE_METHOD_RETURN_TYPE Go(
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Arguments& args,
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const base::Callback<R(P1, P2, P3)>& callback,
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const P1& a1,
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const P2& a2,
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const P3& a3) {
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MATE_METHOD_RETURN(callback.Run(a1, a2, a3));
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}
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};
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template<typename P1, typename P2, typename P3>
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struct Invoker<void, P1, P2, P3, void, void, void> {
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inline static MATE_METHOD_RETURN_TYPE Go(
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Arguments& args,
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const base::Callback<void(P1, P2, P3)>& callback,
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const P1& a1,
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const P2& a2,
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const P3& a3) {
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callback.Run(a1, a2, a3);
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MATE_METHOD_RETURN_UNDEFINED();
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}
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};
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template<typename R, typename P1, typename P2>
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struct Invoker<R, P1, P2, void, void, void, void> {
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inline static MATE_METHOD_RETURN_TYPE Go(
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Arguments& args,
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const base::Callback<R(P1, P2)>& callback,
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const P1& a1,
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const P2& a2) {
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MATE_METHOD_RETURN(callback.Run(a1, a2));
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}
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};
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template<typename P1, typename P2>
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struct Invoker<void, P1, P2, void, void, void, void> {
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inline static MATE_METHOD_RETURN_TYPE Go(
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Arguments& args,
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const base::Callback<void(P1, P2)>& callback,
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const P1& a1,
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const P2& a2) {
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callback.Run(a1, a2);
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MATE_METHOD_RETURN_UNDEFINED();
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}
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};
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template<typename R, typename P1>
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struct Invoker<R, P1, void, void, void, void, void> {
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inline static MATE_METHOD_RETURN_TYPE Go(
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Arguments& args,
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const base::Callback<R(P1)>& callback,
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const P1& a1) {
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MATE_METHOD_RETURN(callback.Run(a1));
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}
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};
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template<typename P1>
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struct Invoker<void, P1, void, void, void, void, void> {
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inline static MATE_METHOD_RETURN_TYPE Go(
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Arguments& args,
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const base::Callback<void(P1)>& callback,
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const P1& a1) {
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MATE_METHOD_RETURN(callback.Run(a1));
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}
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};
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template<typename R>
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struct Invoker<R, void, void, void, void, void, void> {
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inline static MATE_METHOD_RETURN_TYPE Go(
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Arguments& args,
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const base::Callback<R()>& callback) {
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MATE_METHOD_RETURN(callback.Run());
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}
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};
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template<>
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struct Invoker<void, void, void, void, void, void, void> {
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inline static MATE_METHOD_RETURN_TYPE Go(
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Arguments& args,
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const base::Callback<void()>& callback) {
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callback.Run();
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MATE_METHOD_RETURN_UNDEFINED();
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}
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};
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template<typename T>
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bool GetNextArgument(Arguments* args, int create_flags, bool is_first,
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T* result) {
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if (is_first && (create_flags & HolderIsFirstArgument) != 0) {
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return args->GetHolder(result);
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} else {
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return args->GetNext(result);
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}
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}
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// For advanced use cases, we allow callers to request the unparsed Arguments
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// object and poke around in it directly.
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inline bool GetNextArgument(Arguments* args, int create_flags, bool is_first,
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Arguments* result) {
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*result = *args;
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return true;
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}
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inline bool GetNextArgument(Arguments* args, int create_flags, bool is_first,
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Arguments** result) {
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*result = args;
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return true;
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}
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// It's common for clients to just need the isolate, so we make that easy.
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inline bool GetNextArgument(Arguments* args, int create_flags,
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bool is_first, v8::Isolate** result) {
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*result = args->isolate();
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return true;
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}
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// DispatchToCallback converts all the JavaScript arguments to C++ types and
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// invokes the base::Callback.
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template<typename Sig>
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struct Dispatcher {
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};
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template<typename R>
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struct Dispatcher<R()> {
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static MATE_METHOD(DispatchToCallback) {
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Arguments args(info);
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v8::Handle<v8::External> v8_holder;
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CHECK(args.GetData(&v8_holder));
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CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
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v8_holder->Value());
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typedef CallbackHolder<R()> HolderT;
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HolderT* holder = static_cast<HolderT*>(holder_base);
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return Invoker<R>::Go(args, holder->callback);
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}
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};
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template<typename R, typename P1>
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struct Dispatcher<R(P1)> {
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static MATE_METHOD(DispatchToCallback) {
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Arguments args(info);
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v8::Handle<v8::External> v8_holder;
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CHECK(args.GetData(&v8_holder));
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CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
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v8_holder->Value());
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typedef CallbackHolder<R(P1)> HolderT;
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HolderT* holder = static_cast<HolderT*>(holder_base);
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typename CallbackParamTraits<P1>::LocalType a1;
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if (!GetNextArgument(args, holder->flags, true, &a1)) {
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args.ThrowError();
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MATE_METHOD_RETURN_UNDEFINED();
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}
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return Invoker<R, P1>::Go(args, holder->callback, a1);
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}
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};
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template<typename R, typename P1, typename P2>
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struct Dispatcher<R(P1, P2)> {
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static MATE_METHOD(DispatchToCallback) {
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Arguments args(info);
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v8::Handle<v8::External> v8_holder;
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CHECK(args.GetData(&v8_holder));
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CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
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v8_holder->Value());
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typedef CallbackHolder<R(P1, P2)> HolderT;
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HolderT* holder = static_cast<HolderT*>(holder_base);
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typename CallbackParamTraits<P1>::LocalType a1;
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typename CallbackParamTraits<P2>::LocalType a2;
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if (!GetNextArgument(args, holder->flags, true, &a1) ||
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!GetNextArgument(args, holder->flags, false, &a2)) {
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args.ThrowError();
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MATE_METHOD_RETURN_UNDEFINED();
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}
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return Invoker<R, P1, P2>::Go(args, holder->callback, a1, a2);
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}
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};
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template<typename R, typename P1, typename P2, typename P3>
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struct Dispatcher<R(P1, P2, P3)> {
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static MATE_METHOD(DispatchToCallback) {
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Arguments args(info);
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v8::Handle<v8::External> v8_holder;
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CHECK(args.GetData(&v8_holder));
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CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
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v8_holder->Value());
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typedef CallbackHolder<R(P1, P2, P3)> HolderT;
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HolderT* holder = static_cast<HolderT*>(holder_base);
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typename CallbackParamTraits<P1>::LocalType a1;
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typename CallbackParamTraits<P2>::LocalType a2;
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typename CallbackParamTraits<P3>::LocalType a3;
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if (!GetNextArgument(args, holder->flags, true, &a1) ||
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!GetNextArgument(args, holder->flags, false, &a2) ||
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!GetNextArgument(args, holder->flags, false, &a3)) {
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args.ThrowError();
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MATE_METHOD_RETURN_UNDEFINED();
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}
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return Invoker<R, P1, P2, P3>::Go(args, holder->callback, a1, a2, a3);
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}
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};
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template<typename R, typename P1, typename P2, typename P3, typename P4>
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struct Dispatcher<R(P1, P2, P3, P4)> {
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static MATE_METHOD(DispatchToCallback) {
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Arguments args(info);
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v8::Handle<v8::External> v8_holder;
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CHECK(args.GetData(&v8_holder));
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CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
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v8_holder->Value());
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typedef CallbackHolder<R(P1, P2, P3, P4)> HolderT;
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HolderT* holder = static_cast<HolderT*>(holder_base);
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typename CallbackParamTraits<P1>::LocalType a1;
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typename CallbackParamTraits<P2>::LocalType a2;
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typename CallbackParamTraits<P3>::LocalType a3;
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typename CallbackParamTraits<P4>::LocalType a4;
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if (!GetNextArgument(args, holder->flags, true, &a1) ||
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!GetNextArgument(args, holder->flags, false, &a2) ||
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!GetNextArgument(args, holder->flags, false, &a3) ||
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!GetNextArgument(args, holder->flags, false, &a4)) {
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args.ThrowError();
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MATE_METHOD_RETURN_UNDEFINED();
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}
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return Invoker<R, P1, P2, P3, P4>::Go(args, holder->callback, a1, a2, a3,
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a4);
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}
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};
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template<typename R, typename P1, typename P2, typename P3, typename P4,
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typename P5>
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struct Dispatcher<R(P1, P2, P3, P4, P5)> {
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static MATE_METHOD(DispatchToCallback) {
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Arguments args(info);
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v8::Handle<v8::External> v8_holder;
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CHECK(args.GetData(&v8_holder));
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CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
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v8_holder->Value());
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typedef CallbackHolder<R(P1, P2, P3, P4, P5)> HolderT;
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HolderT* holder = static_cast<HolderT*>(holder_base);
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typename CallbackParamTraits<P1>::LocalType a1;
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typename CallbackParamTraits<P2>::LocalType a2;
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typename CallbackParamTraits<P3>::LocalType a3;
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typename CallbackParamTraits<P4>::LocalType a4;
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typename CallbackParamTraits<P5>::LocalType a5;
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if (!GetNextArgument(args, holder->flags, true, &a1) ||
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!GetNextArgument(args, holder->flags, false, &a2) ||
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!GetNextArgument(args, holder->flags, false, &a3) ||
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!GetNextArgument(args, holder->flags, false, &a4) ||
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!GetNextArgument(args, holder->flags, false, &a5)) {
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args.ThrowError();
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MATE_METHOD_RETURN_UNDEFINED();
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}
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return Invoker<R, P1, P2, P3, P4, P5>::Go(args, holder->callback, a1, a2,
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a3, a4, a5);
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}
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};
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template<typename R, typename P1, typename P2, typename P3, typename P4,
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typename P5, typename P6>
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struct Dispatcher<R(P1, P2, P3, P4, P5, P6)> {
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static MATE_METHOD(DispatchToCallback) {
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Arguments args(info);
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v8::Handle<v8::External> v8_holder;
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CHECK(args.GetData(&v8_holder));
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CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>(
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v8_holder->Value());
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typedef CallbackHolder<R(P1, P2, P3, P4, P5, P6)> HolderT;
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HolderT* holder = static_cast<HolderT*>(holder_base);
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typename CallbackParamTraits<P1>::LocalType a1;
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typename CallbackParamTraits<P2>::LocalType a2;
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typename CallbackParamTraits<P3>::LocalType a3;
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typename CallbackParamTraits<P4>::LocalType a4;
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typename CallbackParamTraits<P5>::LocalType a5;
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typename CallbackParamTraits<P6>::LocalType a6;
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if (!GetNextArgument(args, holder->flags, true, &a1) ||
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!GetNextArgument(args, holder->flags, false, &a2) ||
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!GetNextArgument(args, holder->flags, false, &a3) ||
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!GetNextArgument(args, holder->flags, false, &a4) ||
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!GetNextArgument(args, holder->flags, false, &a5) ||
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!GetNextArgument(args, holder->flags, false, &a6)) {
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args.ThrowError();
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MATE_METHOD_RETURN_UNDEFINED();
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}
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return Invoker<R, P1, P2, P3, P4, P5, P6>::Go(args, holder->callback, a1,
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a2, a3, a4, a5, a6);
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}
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};
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} // namespace internal
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// CreateFunctionTemplate creates a v8::FunctionTemplate that will create
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// JavaScript functions that execute a provided C++ function or base::Callback.
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// JavaScript arguments are automatically converted via mate::Converter, as is
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// the return value of the C++ function, if any.
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template<typename Sig>
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v8::Local<v8::FunctionTemplate> CreateFunctionTemplate(
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v8::Isolate* isolate, const base::Callback<Sig> callback,
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int callback_flags = 0) {
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typedef internal::CallbackHolder<Sig> HolderT;
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HolderT* holder = new HolderT(isolate, callback, callback_flags);
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return v8::FunctionTemplate::New(
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isolate,
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&internal::Dispatcher<Sig>::DispatchToCallback,
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ConvertToV8<v8::Handle<v8::External> >(isolate,
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holder->GetHandle(isolate)));
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}
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} // namespace mate
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#endif // NATIVE_MATE_FUNCTION_TEMPLATE_H_
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