Move Source/WTF/wtf to Source/wtf

Source/WTF/wtf/Functional.h

-/*
- * Copyright (C) 2011 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. 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.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 WTF_Functional_h
-#define WTF_Functional_h
-
-#include <wtf/Assertions.h>
-#include <wtf/PassRefPtr.h>
-#include <wtf/RefPtr.h>
-#include <wtf/ThreadSafeRefCounted.h>
-#include <wtf/WeakPtr.h>
-
-#if OS(DARWIN) && COMPILER_SUPPORTS(BLOCKS)
-#include <Block.h>
-#include <wtf/ObjcRuntimeExtras.h>
-#endif
-
-namespace WTF {
-
-// Functional.h provides a very simple way to bind a function pointer and arguments together into a function object
-// that can be stored, copied and invoked, similar to how boost::bind and std::bind in C++11.
-
-// Helper class template to determine whether a given type has ref and deref member functions
-// with the right type signature.
-template<typename T>
-class HasRefAndDeref {
-    typedef char YesType;
-    struct NoType {
-        char padding[8];
-    };
-
-    struct BaseMixin {
-        void deref();
-        void ref();
-    };
-
-    struct Base : public T, public BaseMixin { };
-
-    template<typename U, U> struct
-    TypeChecker { };
-
-    template<typename U>
-    static NoType refCheck(U*, TypeChecker<void (BaseMixin::*)(), &U::ref>* = 0);
-    static YesType refCheck(...);
-
-    template<typename U>
-    static NoType derefCheck(U*, TypeChecker<void (BaseMixin::*)(), &U::deref>* = 0);
-    static YesType derefCheck(...);
-
-public:
-    static const bool value = sizeof(refCheck(static_cast<Base*>(0))) == sizeof(YesType) && sizeof(derefCheck(static_cast<Base*>(0))) == sizeof(YesType);
-};
-
-// A FunctionWrapper is a class template that can wrap a function pointer or a member function pointer and
-// provide a unified interface for calling that function.
-template<typename>
-class FunctionWrapper;
-
-// Bound static functions:
-
-template<typename R>
-class FunctionWrapper<R (*)()> {
-public:
-    typedef R ResultType;
-    static const bool shouldRefFirstParameter = false;
-
-    explicit FunctionWrapper(R (*function)())
-        : m_function(function)
-    {
-    }
-
-    R operator()()
-    {
-        return m_function();
-    }
-
-private:
-    R (*m_function)();
-};
-
-template<typename R, typename P1>
-class FunctionWrapper<R (*)(P1)> {
-public:
-    typedef R ResultType;
-    static const bool shouldRefFirstParameter = false;
-
-    explicit FunctionWrapper(R (*function)(P1))
-        : m_function(function)
-    {
-    }
-
-    R operator()(P1 p1)
-    {
-        return m_function(p1);
-    }
-
-private:
-    R (*m_function)(P1);
-};
-
-template<typename R, typename P1, typename P2>
-class FunctionWrapper<R (*)(P1, P2)> {
-public:
-    typedef R ResultType;
-    static const bool shouldRefFirstParameter = false;
-
-    explicit FunctionWrapper(R (*function)(P1, P2))
-        : m_function(function)
-    {
-    }
-
-    R operator()(P1 p1, P2 p2)
-    {
-        return m_function(p1, p2);
-    }
-
-private:
-    R (*m_function)(P1, P2);
-};
-
-template<typename R, typename P1, typename P2, typename P3>
-class FunctionWrapper<R (*)(P1, P2, P3)> {
-public:
-    typedef R ResultType;
-    static const bool shouldRefFirstParameter = false;
-
-    explicit FunctionWrapper(R (*function)(P1, P2, P3))
-        : m_function(function)
-    {
-    }
-
-    R operator()(P1 p1, P2 p2, P3 p3)
-    {
-        return m_function(p1, p2, p3);
-    }
-
-private:
-    R (*m_function)(P1, P2, P3);
-};
-
-template<typename R, typename P1, typename P2, typename P3, typename P4>
-class FunctionWrapper<R (*)(P1, P2, P3, P4)> {
-public:
-    typedef R ResultType;
-    static const bool shouldRefFirstParameter = false;
-
-    explicit FunctionWrapper(R (*function)(P1, P2, P3, P4))
-        : m_function(function)
-    {
-    }
-
-    R operator()(P1 p1, P2 p2, P3 p3, P4 p4)
-    {
-        return m_function(p1, p2, p3, p4);
-    }
-
-private:
-    R (*m_function)(P1, P2, P3, P4);
-};
-
-template<typename R, typename P1, typename P2, typename P3, typename P4, typename P5>
-class FunctionWrapper<R (*)(P1, P2, P3, P4, P5)> {
-public:
-    typedef R ResultType;
-    static const bool shouldRefFirstParameter = false;
-
-    explicit FunctionWrapper(R (*function)(P1, P2, P3, P4, P5))
-        : m_function(function)
-    {
-    }
-
-    R operator()(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5)
-    {
-        return m_function(p1, p2, p3, p4, p5);
-    }
-
-private:
-    R (*m_function)(P1, P2, P3, P4, P5);
-};
-
-// Bound member functions:
-
-template<typename R, typename C>
-class FunctionWrapper<R (C::*)()> {
-public:
-    typedef R ResultType;
-    static const bool shouldRefFirstParameter = HasRefAndDeref<C>::value;
-
-    explicit FunctionWrapper(R (C::*function)())
-        : m_function(function)
-    {
-    }
-
-    R operator()(C* c)
-    {
-        return (c->*m_function)();
-    }
-
-    R operator()(const WeakPtr<C>& c)
-    {
-        C* obj = c.get();
-        if (!obj)
-            return R();
-        return (obj->*m_function)();
-    }
-
-private:
-    R (C::*m_function)();
-};
-
-template<typename R, typename C, typename P1>
-class FunctionWrapper<R (C::*)(P1)> {
-public:
-    typedef R ResultType;
-    static const bool shouldRefFirstParameter = HasRefAndDeref<C>::value;
-
-    explicit FunctionWrapper(R (C::*function)(P1))
-        : m_function(function)
-    {
-    }
-
-    R operator()(C* c, P1 p1)
-    {
-        return (c->*m_function)(p1);
-    }
-
-    R operator()(const WeakPtr<C>& c, P1 p1)
-    {
-        C* obj = c.get();
-        if (!obj)
-            return R();
-        return (obj->*m_function)(p1);
-    }
-
-private:
-    R (C::*m_function)(P1);
-};
-
-template<typename R, typename C, typename P1, typename P2>
-class FunctionWrapper<R (C::*)(P1, P2)> {
-public:
-    typedef R ResultType;
-    static const bool shouldRefFirstParameter = HasRefAndDeref<C>::value;
-
-    explicit FunctionWrapper(R (C::*function)(P1, P2))
-        : m_function(function)
-    {
-    }
-
-    R operator()(C* c, P1 p1, P2 p2)
-    {
-        return (c->*m_function)(p1, p2);
-    }
-
-    R operator()(const WeakPtr<C>& c, P1 p1, P2 p2)
-    {
-        C* obj = c.get();
-        if (!obj)
-            return R();
-        return (obj->*m_function)(p1, p2);
-    }
-
-private:
-    R (C::*m_function)(P1, P2);
-};
-
-template<typename R, typename C, typename P1, typename P2, typename P3>
-class FunctionWrapper<R (C::*)(P1, P2, P3)> {
-public:
-    typedef R ResultType;
-    static const bool shouldRefFirstParameter = HasRefAndDeref<C>::value;
-
-    explicit FunctionWrapper(R (C::*function)(P1, P2, P3))
-        : m_function(function)
-    {
-    }
-
-    R operator()(C* c, P1 p1, P2 p2, P3 p3)
-    {
-        return (c->*m_function)(p1, p2, p3);
-    }
-
-    R operator()(const WeakPtr<C>& c, P1 p1, P2 p2, P3 p3)
-    {
-        C* obj = c.get();
-        if (!obj)
-            return R();
-        return (obj->*m_function)(p1, p2, p3);
-    }
-
-private:
-    R (C::*m_function)(P1, P2, P3);
-};
-
-template<typename R, typename C, typename P1, typename P2, typename P3, typename P4>
-class FunctionWrapper<R (C::*)(P1, P2, P3, P4)> {
-public:
-    typedef R ResultType;
-    static const bool shouldRefFirstParameter = HasRefAndDeref<C>::value;
-
-    explicit FunctionWrapper(R (C::*function)(P1, P2, P3, P4))
-        : m_function(function)
-    {
-    }
-
-    R operator()(C* c, P1 p1, P2 p2, P3 p3, P4 p4)
-    {
-        return (c->*m_function)(p1, p2, p3, p4);
-    }
-
-    R operator()(const WeakPtr<C>& c, P1 p1, P2 p2, P3 p3, P4 p4)
-    {
-        C* obj = c.get();
-        if (!obj)
-            return R();
-        return (obj->*m_function)(p1, p2, p3, p4);
-    }
-
-private:
-    R (C::*m_function)(P1, P2, P3, P4);
-};
-
-template<typename R, typename C, typename P1, typename P2, typename P3, typename P4, typename P5>
-class FunctionWrapper<R (C::*)(P1, P2, P3, P4, P5)> {
-public:
-    typedef R ResultType;
-    static const bool shouldRefFirstParameter = HasRefAndDeref<C>::value;
-
-    explicit FunctionWrapper(R (C::*function)(P1, P2, P3, P4, P5))
-        : m_function(function)
-    {
-    }
-
-    R operator()(C* c, P1 p1, P2 p2, P3 p3, P4 p4, P5 p5)
-    {
-        return (c->*m_function)(p1, p2, p3, p4, p5);
-    }
-
-    R operator()(const WeakPtr<C>& c, P1 p1, P2 p2, P3 p3, P4 p4, P5 p5)
-    {
-        C* obj = c.get();
-        if (!obj)
-            return R();
-        return (obj->*m_function)(p1, p2, p3, p4, p5);
-    }
-
-private:
-    R (C::*m_function)(P1, P2, P3, P4, P5);
-};
-
-#if OS(DARWIN) && COMPILER_SUPPORTS(BLOCKS)
-template<typename R>
-class FunctionWrapper<R (^)()> {
-public:
-    typedef R ResultType;
-    static const bool shouldRefFirstParameter = false;
-
-    explicit FunctionWrapper(R (^block)())
-        : m_block(Block_copy(block))
-    {
-    }
-
-    FunctionWrapper(const FunctionWrapper& other)
-        : m_block(Block_copy(other.m_block))
-    {
-    }
-
-    ~FunctionWrapper()
-    {
-        Block_release(m_block);
-    }
-
-    R operator()()
-    {
-        return m_block();
-    }
-
-private:
-    R (^m_block)();
-};
-#endif
-
-template<typename T, bool shouldRefAndDeref> struct RefAndDeref {
-    static void ref(T) { }
-    static void deref(T) { }
-};
-
-template<typename T> struct RefAndDeref<T*, true> {
-    static void ref(T* t) { t->ref(); }
-    static void deref(T* t) { t->deref(); }
-};
-
-template<typename T> struct ParamStorageTraits {
-    typedef T StorageType;
-
-    static StorageType wrap(const T& value) { return value; }
-    static const T& unwrap(const StorageType& value) { return value; }
-};
-
-template<typename T> struct ParamStorageTraits<PassRefPtr<T> > {
-    typedef RefPtr<T> StorageType;
-
-    static StorageType wrap(PassRefPtr<T> value) { return value; }
-    static T* unwrap(const StorageType& value) { return value.get(); }
-};
-
-template<typename T> struct ParamStorageTraits<RefPtr<T> > {
-    typedef RefPtr<T> StorageType;
-
-    static StorageType wrap(RefPtr<T> value) { return value.release(); }
-    static T* unwrap(const StorageType& value) { return value.get(); }
-};
-
-template<typename> class RetainPtr;
-
-template<typename T> struct ParamStorageTraits<RetainPtr<T> > {
-    typedef RetainPtr<T> StorageType;
-
-    static StorageType wrap(const RetainPtr<T>& value) { return value; }
-    static typename RetainPtr<T>::PtrType unwrap(const StorageType& value) { return value.get(); }
-};
-
-class FunctionImplBase : public ThreadSafeRefCounted<FunctionImplBase> {
-public:
-    virtual ~FunctionImplBase() { }
-};
-
-template<typename>
-class FunctionImpl;
-
-template<typename R>
-class FunctionImpl<R ()> : public FunctionImplBase {
-public:
-    virtual R operator()() = 0;
-};
-
-template<typename FunctionWrapper, typename FunctionType>
-class BoundFunctionImpl;
-
-template<typename FunctionWrapper, typename R>
-class BoundFunctionImpl<FunctionWrapper, R ()> : public FunctionImpl<typename FunctionWrapper::ResultType ()> {
-public:
-    explicit BoundFunctionImpl(FunctionWrapper functionWrapper)
-        : m_functionWrapper(functionWrapper)
-    {
-    }
-
-    virtual typename FunctionWrapper::ResultType operator()()
-    {
-        return m_functionWrapper();
-    }
-
-private:
-    FunctionWrapper m_functionWrapper;
-};
-
-template<typename FunctionWrapper, typename R, typename P1>
-class BoundFunctionImpl<FunctionWrapper, R (P1)> : public FunctionImpl<typename FunctionWrapper::ResultType ()> {
-public:
-    BoundFunctionImpl(FunctionWrapper functionWrapper, const P1& p1)
-        : m_functionWrapper(functionWrapper)
-        , m_p1(ParamStorageTraits<P1>::wrap(p1))
-    {
-        RefAndDeref<P1, FunctionWrapper::shouldRefFirstParameter>::ref(m_p1);
-    }
-
-    ~BoundFunctionImpl()
-    {
-        RefAndDeref<P1, FunctionWrapper::shouldRefFirstParameter>::deref(m_p1);
-    }
-
-    virtual typename FunctionWrapper::ResultType operator()()
-    {
-        return m_functionWrapper(ParamStorageTraits<P1>::unwrap(m_p1));
-    }
-
-private:
-    FunctionWrapper m_functionWrapper;
-    typename ParamStorageTraits<P1>::StorageType m_p1;
-};
-
-template<typename FunctionWrapper, typename R, typename P1, typename P2>
-class BoundFunctionImpl<FunctionWrapper, R (P1, P2)> : public FunctionImpl<typename FunctionWrapper::ResultType ()> {
-public:
-    BoundFunctionImpl(FunctionWrapper functionWrapper, const P1& p1, const P2& p2)
-        : m_functionWrapper(functionWrapper)
-        , m_p1(ParamStorageTraits<P1>::wrap(p1))
-        , m_p2(ParamStorageTraits<P2>::wrap(p2))
-    {
-        RefAndDeref<P1, FunctionWrapper::shouldRefFirstParameter>::ref(m_p1);
-    }
-    
-    ~BoundFunctionImpl()
-    {
-        RefAndDeref<P1, FunctionWrapper::shouldRefFirstParameter>::deref(m_p1);
-    }
-
-    virtual typename FunctionWrapper::ResultType operator()()
-    {
-        return m_functionWrapper(ParamStorageTraits<P1>::unwrap(m_p1), ParamStorageTraits<P2>::unwrap(m_p2));
-    }
-
-private:
-    FunctionWrapper m_functionWrapper;
-    typename ParamStorageTraits<P1>::StorageType m_p1;
-    typename ParamStorageTraits<P2>::StorageType m_p2;
-};
-
-template<typename FunctionWrapper, typename R, typename P1, typename P2, typename P3>
-class BoundFunctionImpl<FunctionWrapper, R (P1, P2, P3)> : public FunctionImpl<typename FunctionWrapper::ResultType ()> {
-public:
-    BoundFunctionImpl(FunctionWrapper functionWrapper, const P1& p1, const P2& p2, const P3& p3)
-        : m_functionWrapper(functionWrapper)
-        , m_p1(ParamStorageTraits<P1>::wrap(p1))
-        , m_p2(ParamStorageTraits<P2>::wrap(p2))
-        , m_p3(ParamStorageTraits<P3>::wrap(p3))
-    {
-        RefAndDeref<P1, FunctionWrapper::shouldRefFirstParameter>::ref(m_p1);
-    }
-    
-    ~BoundFunctionImpl()
-    {
-        RefAndDeref<P1, FunctionWrapper::shouldRefFirstParameter>::deref(m_p1);
-    }
-
-    virtual typename FunctionWrapper::ResultType operator()()
-    {
-        return m_functionWrapper(ParamStorageTraits<P1>::unwrap(m_p1), ParamStorageTraits<P2>::unwrap(m_p2), ParamStorageTraits<P3>::unwrap(m_p3));
-    }
-
-private:
-    FunctionWrapper m_functionWrapper;
-    typename ParamStorageTraits<P1>::StorageType m_p1;
-    typename ParamStorageTraits<P2>::StorageType m_p2;
-    typename ParamStorageTraits<P3>::StorageType m_p3;
-};
-
-template<typename FunctionWrapper, typename R, typename P1, typename P2, typename P3, typename P4>
-class BoundFunctionImpl<FunctionWrapper, R (P1, P2, P3, P4)> : public FunctionImpl<typename FunctionWrapper::ResultType ()> {
-public:
-    BoundFunctionImpl(FunctionWrapper functionWrapper, const P1& p1, const P2& p2, const P3& p3, const P4& p4)
-        : m_functionWrapper(functionWrapper)
-        , m_p1(ParamStorageTraits<P1>::wrap(p1))
-        , m_p2(ParamStorageTraits<P2>::wrap(p2))
-        , m_p3(ParamStorageTraits<P3>::wrap(p3))
-        , m_p4(ParamStorageTraits<P4>::wrap(p4))
-    {
-        RefAndDeref<P1, FunctionWrapper::shouldRefFirstParameter>::ref(m_p1);
-    }
-    
-    ~BoundFunctionImpl()
-    {
-        RefAndDeref<P1, FunctionWrapper::shouldRefFirstParameter>::deref(m_p1);
-    }
-
-    virtual typename FunctionWrapper::ResultType operator()()
-    {
-        return m_functionWrapper(ParamStorageTraits<P1>::unwrap(m_p1), ParamStorageTraits<P2>::unwrap(m_p2), ParamStorageTraits<P3>::unwrap(m_p3), ParamStorageTraits<P4>::unwrap(m_p4));
-    }
-
-private:
-    FunctionWrapper m_functionWrapper;
-    typename ParamStorageTraits<P1>::StorageType m_p1;
-    typename ParamStorageTraits<P2>::StorageType m_p2;
-    typename ParamStorageTraits<P3>::StorageType m_p3;
-    typename ParamStorageTraits<P4>::StorageType m_p4;
-};
-
-template<typename FunctionWrapper, typename R, typename P1, typename P2, typename P3, typename P4, typename P5>
-class BoundFunctionImpl<FunctionWrapper, R (P1, P2, P3, P4, P5)> : public FunctionImpl<typename FunctionWrapper::ResultType ()> {
-public:
-    BoundFunctionImpl(FunctionWrapper functionWrapper, const P1& p1, const P2& p2, const P3& p3, const P4& p4, const P5& p5)
-        : m_functionWrapper(functionWrapper)
-        , m_p1(ParamStorageTraits<P1>::wrap(p1))
-        , m_p2(ParamStorageTraits<P2>::wrap(p2))
-        , m_p3(ParamStorageTraits<P3>::wrap(p3))
-        , m_p4(ParamStorageTraits<P4>::wrap(p4))
-        , m_p5(ParamStorageTraits<P5>::wrap(p5))
-    {
-        RefAndDeref<P1, FunctionWrapper::shouldRefFirstParameter>::ref(m_p1);
-    }
-    
-    ~BoundFunctionImpl()
-    {
-        RefAndDeref<P1, FunctionWrapper::shouldRefFirstParameter>::deref(m_p1);
-    }
-
-    virtual typename FunctionWrapper::ResultType operator()()
-    {
-        return m_functionWrapper(ParamStorageTraits<P1>::unwrap(m_p1), ParamStorageTraits<P2>::unwrap(m_p2), ParamStorageTraits<P3>::unwrap(m_p3), ParamStorageTraits<P4>::unwrap(m_p4), ParamStorageTraits<P5>::unwrap(m_p5));
-    }
-
-private:
-    FunctionWrapper m_functionWrapper;
-    typename ParamStorageTraits<P1>::StorageType m_p1;
-    typename ParamStorageTraits<P2>::StorageType m_p2;
-    typename ParamStorageTraits<P3>::StorageType m_p3;
-    typename ParamStorageTraits<P4>::StorageType m_p4;
-    typename ParamStorageTraits<P5>::StorageType m_p5;
-};
-
-template<typename FunctionWrapper, typename R, typename P1, typename P2, typename P3, typename P4, typename P5, typename P6>
-class BoundFunctionImpl<FunctionWrapper, R (P1, P2, P3, P4, P5, P6)> : public FunctionImpl<typename FunctionWrapper::ResultType ()> {
-public:
-    BoundFunctionImpl(FunctionWrapper functionWrapper, const P1& p1, const P2& p2, const P3& p3, const P4& p4, const P5& p5, const P6& p6)
-        : m_functionWrapper(functionWrapper)
-        , m_p1(ParamStorageTraits<P1>::wrap(p1))
-        , m_p2(ParamStorageTraits<P2>::wrap(p2))
-        , m_p3(ParamStorageTraits<P3>::wrap(p3))
-        , m_p4(ParamStorageTraits<P4>::wrap(p4))
-        , m_p5(ParamStorageTraits<P5>::wrap(p5))
-        , m_p6(ParamStorageTraits<P6>::wrap(p6))
-    {
-        RefAndDeref<P1, FunctionWrapper::shouldRefFirstParameter>::ref(m_p1);
-    }
-
-    ~BoundFunctionImpl()
-    {
-        RefAndDeref<P1, FunctionWrapper::shouldRefFirstParameter>::deref(m_p1);
-    }
-
-    virtual typename FunctionWrapper::ResultType operator()()
-    {
-        return m_functionWrapper(ParamStorageTraits<P1>::unwrap(m_p1), ParamStorageTraits<P2>::unwrap(m_p2), ParamStorageTraits<P3>::unwrap(m_p3), ParamStorageTraits<P4>::unwrap(m_p4), ParamStorageTraits<P5>::unwrap(m_p5), ParamStorageTraits<P6>::unwrap(m_p6));
-    }
-
-private:
-    FunctionWrapper m_functionWrapper;
-    typename ParamStorageTraits<P1>::StorageType m_p1;
-    typename ParamStorageTraits<P2>::StorageType m_p2;
-    typename ParamStorageTraits<P3>::StorageType m_p3;
-    typename ParamStorageTraits<P4>::StorageType m_p4;
-    typename ParamStorageTraits<P5>::StorageType m_p5;
-    typename ParamStorageTraits<P6>::StorageType m_p6;
-};
-
-class FunctionBase {
-public:
-    bool isNull() const
-    {
-        return !m_impl;
-    }
-
-protected:
-    FunctionBase()
-    {
-    }
-
-    explicit FunctionBase(PassRefPtr<FunctionImplBase> impl)
-        : m_impl(impl)
-    {
-    }
-
-    template<typename FunctionType> FunctionImpl<FunctionType>* impl() const
-    { 
-        return static_cast<FunctionImpl<FunctionType>*>(m_impl.get());
-    }
-
-private:
-    RefPtr<FunctionImplBase> m_impl;
-};
-
-template<typename>
-class Function;
-
-template<typename R>
-class Function<R ()> : public FunctionBase {
-public:
-    Function()
-    {
-    }
-
-    Function(PassRefPtr<FunctionImpl<R ()> > impl)
-        : FunctionBase(impl)
-    {
-    }
-
-    R operator()() const
-    {
-        ASSERT(!isNull());
-
-        return impl<R ()>()->operator()();
-    }
-
-#if OS(DARWIN) && COMPILER_SUPPORTS(BLOCKS)
-    typedef void (^BlockType)();
-    operator BlockType() const
-    {
-        // Declare a RefPtr here so we'll be sure that the underlying FunctionImpl object's
-        // lifecycle is managed correctly.
-        RefPtr<FunctionImpl<R ()> > functionImpl = impl<R ()>();
-        BlockType block = ^{
-           functionImpl->operator()();
-        };
-
-        // This is equivalent to:
-        //
-        //   return [[block copy] autorelease];
-        //
-        // We're using manual objc_msgSend calls here because we don't want to make the entire
-        // file Objective-C. It's useful to be able to implicitly convert a Function to
-        // a block even in C++ code, since that allows us to do things like:
-        //
-        //   dispatch_async(queue, bind(...));
-        //
-        id copiedBlock = wtfObjcMsgSend<id>((id)block, sel_registerName("copy"));
-        id autoreleasedBlock = wtfObjcMsgSend<id>(copiedBlock, sel_registerName("autorelease"));
-        return (BlockType)autoreleasedBlock;
-    }
-#endif
-};
-
-template<typename FunctionType>
-Function<typename FunctionWrapper<FunctionType>::ResultType ()> bind(FunctionType function)
-{
-    return Function<typename FunctionWrapper<FunctionType>::ResultType ()>(adoptRef(new BoundFunctionImpl<FunctionWrapper<FunctionType>, typename FunctionWrapper<FunctionType>::ResultType ()>(FunctionWrapper<FunctionType>(function))));
-}
-
-template<typename FunctionType, typename A1>
-Function<typename FunctionWrapper<FunctionType>::ResultType ()> bind(FunctionType function, const A1& a1)
-{
-    return Function<typename FunctionWrapper<FunctionType>::ResultType ()>(adoptRef(new BoundFunctionImpl<FunctionWrapper<FunctionType>, typename FunctionWrapper<FunctionType>::ResultType (A1)>(FunctionWrapper<FunctionType>(function), a1)));
-}
-
-template<typename FunctionType, typename A1, typename A2>
-Function<typename FunctionWrapper<FunctionType>::ResultType ()> bind(FunctionType function, const A1& a1, const A2& a2)
-{
-    return Function<typename FunctionWrapper<FunctionType>::ResultType ()>(adoptRef(new BoundFunctionImpl<FunctionWrapper<FunctionType>, typename FunctionWrapper<FunctionType>::ResultType (A1, A2)>(FunctionWrapper<FunctionType>(function), a1, a2)));
-}
-
-template<typename FunctionType, typename A1, typename A2, typename A3>
-Function<typename FunctionWrapper<FunctionType>::ResultType ()> bind(FunctionType function, const A1& a1, const A2& a2, const A3& a3)
-{
-    return Function<typename FunctionWrapper<FunctionType>::ResultType ()>(adoptRef(new BoundFunctionImpl<FunctionWrapper<FunctionType>, typename FunctionWrapper<FunctionType>::ResultType (A1, A2, A3)>(FunctionWrapper<FunctionType>(function), a1, a2, a3)));
-}
-
-template<typename FunctionType, typename A1, typename A2, typename A3, typename A4>
-Function<typename FunctionWrapper<FunctionType>::ResultType ()> bind(FunctionType function, const A1& a1, const A2& a2, const A3& a3, const A4& a4)
-{
-    return Function<typename FunctionWrapper<FunctionType>::ResultType ()>(adoptRef(new BoundFunctionImpl<FunctionWrapper<FunctionType>, typename FunctionWrapper<FunctionType>::ResultType (A1, A2, A3, A4)>(FunctionWrapper<FunctionType>(function), a1, a2, a3, a4)));
-}
-
-template<typename FunctionType, typename A1, typename A2, typename A3, typename A4, typename A5>
-Function<typename FunctionWrapper<FunctionType>::ResultType ()> bind(FunctionType function, const A1& a1, const A2& a2, const A3& a3, const A4& a4, const A5& a5)
-{
-    return Function<typename FunctionWrapper<FunctionType>::ResultType ()>(adoptRef(new BoundFunctionImpl<FunctionWrapper<FunctionType>, typename FunctionWrapper<FunctionType>::ResultType (A1, A2, A3, A4, A5)>(FunctionWrapper<FunctionType>(function), a1, a2, a3, a4, a5)));
-}
-
-template<typename FunctionType, typename A1, typename A2, typename A3, typename A4, typename A5, typename A6>
-Function<typename FunctionWrapper<FunctionType>::ResultType ()> bind(FunctionType function, const A1& a1, const A2& a2, const A3& a3, const A4& a4, const A5& a5, const A6& a6)
-{
-    return Function<typename FunctionWrapper<FunctionType>::ResultType ()>(adoptRef(new BoundFunctionImpl<FunctionWrapper<FunctionType>, typename FunctionWrapper<FunctionType>::ResultType (A1, A2, A3, A4, A5, A6)>(FunctionWrapper<FunctionType>(function), a1, a2, a3, a4, a5, a6)));
-}
-
-}
-
-using WTF::Function;
-using WTF::bind;
-
-#endif // WTF_Functional_h