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cef_bind_internal.h
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3190 lines (2804 loc) · 118 KB
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// Copyright (c) 2011 Google 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:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the name Chromium Embedded
// Framework nor the names of its contributors may be used to endorse
// or promote products derived from this software without specific prior
// written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Do not include this header file directly. Use base/cef_bind.h instead.
#ifndef CEF_INCLUDE_BASE_INTERNAL_CEF_BIND_INTERNAL_H_
#define CEF_INCLUDE_BASE_INTERNAL_CEF_BIND_INTERNAL_H_
#include "include/base/cef_bind_helpers.h"
#include "include/base/cef_build.h"
#include "include/base/cef_template_util.h"
#include "include/base/cef_weak_ptr.h"
#include "include/base/internal/cef_callback_internal.h"
#include "include/base/internal/cef_raw_scoped_refptr_mismatch_checker.h"
#if defined(OS_WIN)
#include "include/base/internal/cef_bind_internal_win.h"
#endif
namespace base {
namespace cef_internal {
// See base/callback.h for user documentation.
//
//
// CONCEPTS:
// Runnable -- A type (really a type class) that has a single Run() method
// and a RunType typedef that corresponds to the type of Run().
// A Runnable can declare that it should treated like a method
// call by including a typedef named IsMethod. The value of
// this typedef is NOT inspected, only the existence. When a
// Runnable declares itself a method, Bind() will enforce special
// refcounting + WeakPtr handling semantics for the first
// parameter which is expected to be an object.
// Functor -- A copyable type representing something that should be called.
// All function pointers, Callback<>, and Runnables are functors
// even if the invocation syntax differs.
// RunType -- A function type (as opposed to function _pointer_ type) for
// a Run() function. Usually just a convenience typedef.
// (Bound)ArgsType -- A function type that is being (ab)used to store the
// types of set of arguments. The "return" type is always
// void here. We use this hack so that we do not need
// a new type name for each arity of type. (eg.,
// BindState1, BindState2). This makes forward
// declarations and friending much much easier.
//
// Types:
// RunnableAdapter<> -- Wraps the various "function" pointer types into an
// object that adheres to the Runnable interface.
// There are |3*ARITY| RunnableAdapter types.
// FunctionTraits<> -- Type traits that unwrap a function signature into a
// a set of easier to use typedefs. Used mainly for
// compile time asserts.
// There are |ARITY| FunctionTraits types.
// ForceVoidReturn<> -- Helper class for translating function signatures to
// equivalent forms with a "void" return type.
// There are |ARITY| ForceVoidReturn types.
// FunctorTraits<> -- Type traits used determine the correct RunType and
// RunnableType for a Functor. This is where function
// signature adapters are applied.
// There are |ARITY| ForceVoidReturn types.
// MakeRunnable<> -- Takes a Functor and returns an object in the Runnable
// type class that represents the underlying Functor.
// There are |O(1)| MakeRunnable types.
// InvokeHelper<> -- Take a Runnable + arguments and actully invokes it.
// Handle the differing syntaxes needed for WeakPtr<> support,
// and for ignoring return values. This is separate from
// Invoker to avoid creating multiple version of Invoker<>
// which grows at O(n^2) with the arity.
// There are |k*ARITY| InvokeHelper types.
// Invoker<> -- Unwraps the curried parameters and executes the Runnable.
// There are |(ARITY^2 + ARITY)/2| Invoketypes.
// BindState<> -- Stores the curried parameters, and is the main entry point
// into the Bind() system, doing most of the type resolution.
// There are ARITY BindState types.
// RunnableAdapter<>
//
// The RunnableAdapter<> templates provide a uniform interface for invoking
// a function pointer, method pointer, or const method pointer. The adapter
// exposes a Run() method with an appropriate signature. Using this wrapper
// allows for writing code that supports all three pointer types without
// undue repetition. Without it, a lot of code would need to be repeated 3
// times.
//
// For method pointers and const method pointers the first argument to Run()
// is considered to be the received of the method. This is similar to STL's
// mem_fun().
//
// This class also exposes a RunType typedef that is the function type of the
// Run() function.
//
// If and only if the wrapper contains a method or const method pointer, an
// IsMethod typedef is exposed. The existence of this typedef (NOT the value)
// marks that the wrapper should be considered a method wrapper.
template <typename Functor>
class RunnableAdapter;
// Function: Arity 0.
template <typename R>
class RunnableAdapter<R (*)()> {
public:
typedef R(RunType)();
explicit RunnableAdapter(R (*function)()) : function_(function) {}
R Run() { return function_(); }
private:
R (*function_)();
};
// Method: Arity 0.
template <typename R, typename T>
class RunnableAdapter<R (T::*)()> {
public:
typedef R(RunType)(T*);
typedef true_type IsMethod;
explicit RunnableAdapter(R (T::*method)()) : method_(method) {}
R Run(T* object) { return (object->*method_)(); }
private:
R (T::*method_)();
};
// Const Method: Arity 0.
template <typename R, typename T>
class RunnableAdapter<R (T::*)() const> {
public:
typedef R(RunType)(const T*);
typedef true_type IsMethod;
explicit RunnableAdapter(R (T::*method)() const) : method_(method) {}
R Run(const T* object) { return (object->*method_)(); }
private:
R (T::*method_)() const;
};
// Function: Arity 1.
template <typename R, typename A1>
class RunnableAdapter<R (*)(A1)> {
public:
typedef R(RunType)(A1);
explicit RunnableAdapter(R (*function)(A1)) : function_(function) {}
R Run(typename CallbackParamTraits<A1>::ForwardType a1) {
return function_(CallbackForward(a1));
}
private:
R (*function_)(A1);
};
// Method: Arity 1.
template <typename R, typename T, typename A1>
class RunnableAdapter<R (T::*)(A1)> {
public:
typedef R(RunType)(T*, A1);
typedef true_type IsMethod;
explicit RunnableAdapter(R (T::*method)(A1)) : method_(method) {}
R Run(T* object, typename CallbackParamTraits<A1>::ForwardType a1) {
return (object->*method_)(CallbackForward(a1));
}
private:
R (T::*method_)(A1);
};
// Const Method: Arity 1.
template <typename R, typename T, typename A1>
class RunnableAdapter<R (T::*)(A1) const> {
public:
typedef R(RunType)(const T*, A1);
typedef true_type IsMethod;
explicit RunnableAdapter(R (T::*method)(A1) const) : method_(method) {}
R Run(const T* object, typename CallbackParamTraits<A1>::ForwardType a1) {
return (object->*method_)(CallbackForward(a1));
}
private:
R (T::*method_)(A1) const;
};
// Function: Arity 2.
template <typename R, typename A1, typename A2>
class RunnableAdapter<R (*)(A1, A2)> {
public:
typedef R(RunType)(A1, A2);
explicit RunnableAdapter(R (*function)(A1, A2)) : function_(function) {}
R Run(typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2) {
return function_(CallbackForward(a1), CallbackForward(a2));
}
private:
R (*function_)(A1, A2);
};
// Method: Arity 2.
template <typename R, typename T, typename A1, typename A2>
class RunnableAdapter<R (T::*)(A1, A2)> {
public:
typedef R(RunType)(T*, A1, A2);
typedef true_type IsMethod;
explicit RunnableAdapter(R (T::*method)(A1, A2)) : method_(method) {}
R Run(T* object,
typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2) {
return (object->*method_)(CallbackForward(a1), CallbackForward(a2));
}
private:
R (T::*method_)(A1, A2);
};
// Const Method: Arity 2.
template <typename R, typename T, typename A1, typename A2>
class RunnableAdapter<R (T::*)(A1, A2) const> {
public:
typedef R(RunType)(const T*, A1, A2);
typedef true_type IsMethod;
explicit RunnableAdapter(R (T::*method)(A1, A2) const) : method_(method) {}
R Run(const T* object,
typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2) {
return (object->*method_)(CallbackForward(a1), CallbackForward(a2));
}
private:
R (T::*method_)(A1, A2) const;
};
// Function: Arity 3.
template <typename R, typename A1, typename A2, typename A3>
class RunnableAdapter<R (*)(A1, A2, A3)> {
public:
typedef R(RunType)(A1, A2, A3);
explicit RunnableAdapter(R (*function)(A1, A2, A3)) : function_(function) {}
R Run(typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2,
typename CallbackParamTraits<A3>::ForwardType a3) {
return function_(CallbackForward(a1), CallbackForward(a2),
CallbackForward(a3));
}
private:
R (*function_)(A1, A2, A3);
};
// Method: Arity 3.
template <typename R, typename T, typename A1, typename A2, typename A3>
class RunnableAdapter<R (T::*)(A1, A2, A3)> {
public:
typedef R(RunType)(T*, A1, A2, A3);
typedef true_type IsMethod;
explicit RunnableAdapter(R (T::*method)(A1, A2, A3)) : method_(method) {}
R Run(T* object,
typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2,
typename CallbackParamTraits<A3>::ForwardType a3) {
return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
CallbackForward(a3));
}
private:
R (T::*method_)(A1, A2, A3);
};
// Const Method: Arity 3.
template <typename R, typename T, typename A1, typename A2, typename A3>
class RunnableAdapter<R (T::*)(A1, A2, A3) const> {
public:
typedef R(RunType)(const T*, A1, A2, A3);
typedef true_type IsMethod;
explicit RunnableAdapter(R (T::*method)(A1, A2, A3) const)
: method_(method) {}
R Run(const T* object,
typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2,
typename CallbackParamTraits<A3>::ForwardType a3) {
return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
CallbackForward(a3));
}
private:
R (T::*method_)(A1, A2, A3) const;
};
// Function: Arity 4.
template <typename R, typename A1, typename A2, typename A3, typename A4>
class RunnableAdapter<R (*)(A1, A2, A3, A4)> {
public:
typedef R(RunType)(A1, A2, A3, A4);
explicit RunnableAdapter(R (*function)(A1, A2, A3, A4))
: function_(function) {}
R Run(typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2,
typename CallbackParamTraits<A3>::ForwardType a3,
typename CallbackParamTraits<A4>::ForwardType a4) {
return function_(CallbackForward(a1), CallbackForward(a2),
CallbackForward(a3), CallbackForward(a4));
}
private:
R (*function_)(A1, A2, A3, A4);
};
// Method: Arity 4.
template <typename R,
typename T,
typename A1,
typename A2,
typename A3,
typename A4>
class RunnableAdapter<R (T::*)(A1, A2, A3, A4)> {
public:
typedef R(RunType)(T*, A1, A2, A3, A4);
typedef true_type IsMethod;
explicit RunnableAdapter(R (T::*method)(A1, A2, A3, A4)) : method_(method) {}
R Run(T* object,
typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2,
typename CallbackParamTraits<A3>::ForwardType a3,
typename CallbackParamTraits<A4>::ForwardType a4) {
return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
CallbackForward(a3), CallbackForward(a4));
}
private:
R (T::*method_)(A1, A2, A3, A4);
};
// Const Method: Arity 4.
template <typename R,
typename T,
typename A1,
typename A2,
typename A3,
typename A4>
class RunnableAdapter<R (T::*)(A1, A2, A3, A4) const> {
public:
typedef R(RunType)(const T*, A1, A2, A3, A4);
typedef true_type IsMethod;
explicit RunnableAdapter(R (T::*method)(A1, A2, A3, A4) const)
: method_(method) {}
R Run(const T* object,
typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2,
typename CallbackParamTraits<A3>::ForwardType a3,
typename CallbackParamTraits<A4>::ForwardType a4) {
return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
CallbackForward(a3), CallbackForward(a4));
}
private:
R (T::*method_)(A1, A2, A3, A4) const;
};
// Function: Arity 5.
template <typename R,
typename A1,
typename A2,
typename A3,
typename A4,
typename A5>
class RunnableAdapter<R (*)(A1, A2, A3, A4, A5)> {
public:
typedef R(RunType)(A1, A2, A3, A4, A5);
explicit RunnableAdapter(R (*function)(A1, A2, A3, A4, A5))
: function_(function) {}
R Run(typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2,
typename CallbackParamTraits<A3>::ForwardType a3,
typename CallbackParamTraits<A4>::ForwardType a4,
typename CallbackParamTraits<A5>::ForwardType a5) {
return function_(CallbackForward(a1), CallbackForward(a2),
CallbackForward(a3), CallbackForward(a4),
CallbackForward(a5));
}
private:
R (*function_)(A1, A2, A3, A4, A5);
};
// Method: Arity 5.
template <typename R,
typename T,
typename A1,
typename A2,
typename A3,
typename A4,
typename A5>
class RunnableAdapter<R (T::*)(A1, A2, A3, A4, A5)> {
public:
typedef R(RunType)(T*, A1, A2, A3, A4, A5);
typedef true_type IsMethod;
explicit RunnableAdapter(R (T::*method)(A1, A2, A3, A4, A5))
: method_(method) {}
R Run(T* object,
typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2,
typename CallbackParamTraits<A3>::ForwardType a3,
typename CallbackParamTraits<A4>::ForwardType a4,
typename CallbackParamTraits<A5>::ForwardType a5) {
return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
CallbackForward(a3), CallbackForward(a4),
CallbackForward(a5));
}
private:
R (T::*method_)(A1, A2, A3, A4, A5);
};
// Const Method: Arity 5.
template <typename R,
typename T,
typename A1,
typename A2,
typename A3,
typename A4,
typename A5>
class RunnableAdapter<R (T::*)(A1, A2, A3, A4, A5) const> {
public:
typedef R(RunType)(const T*, A1, A2, A3, A4, A5);
typedef true_type IsMethod;
explicit RunnableAdapter(R (T::*method)(A1, A2, A3, A4, A5) const)
: method_(method) {}
R Run(const T* object,
typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2,
typename CallbackParamTraits<A3>::ForwardType a3,
typename CallbackParamTraits<A4>::ForwardType a4,
typename CallbackParamTraits<A5>::ForwardType a5) {
return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
CallbackForward(a3), CallbackForward(a4),
CallbackForward(a5));
}
private:
R (T::*method_)(A1, A2, A3, A4, A5) const;
};
// Function: Arity 6.
template <typename R,
typename A1,
typename A2,
typename A3,
typename A4,
typename A5,
typename A6>
class RunnableAdapter<R (*)(A1, A2, A3, A4, A5, A6)> {
public:
typedef R(RunType)(A1, A2, A3, A4, A5, A6);
explicit RunnableAdapter(R (*function)(A1, A2, A3, A4, A5, A6))
: function_(function) {}
R Run(typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2,
typename CallbackParamTraits<A3>::ForwardType a3,
typename CallbackParamTraits<A4>::ForwardType a4,
typename CallbackParamTraits<A5>::ForwardType a5,
typename CallbackParamTraits<A6>::ForwardType a6) {
return function_(CallbackForward(a1), CallbackForward(a2),
CallbackForward(a3), CallbackForward(a4),
CallbackForward(a5), CallbackForward(a6));
}
private:
R (*function_)(A1, A2, A3, A4, A5, A6);
};
// Method: Arity 6.
template <typename R,
typename T,
typename A1,
typename A2,
typename A3,
typename A4,
typename A5,
typename A6>
class RunnableAdapter<R (T::*)(A1, A2, A3, A4, A5, A6)> {
public:
typedef R(RunType)(T*, A1, A2, A3, A4, A5, A6);
typedef true_type IsMethod;
explicit RunnableAdapter(R (T::*method)(A1, A2, A3, A4, A5, A6))
: method_(method) {}
R Run(T* object,
typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2,
typename CallbackParamTraits<A3>::ForwardType a3,
typename CallbackParamTraits<A4>::ForwardType a4,
typename CallbackParamTraits<A5>::ForwardType a5,
typename CallbackParamTraits<A6>::ForwardType a6) {
return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
CallbackForward(a3), CallbackForward(a4),
CallbackForward(a5), CallbackForward(a6));
}
private:
R (T::*method_)(A1, A2, A3, A4, A5, A6);
};
// Const Method: Arity 6.
template <typename R,
typename T,
typename A1,
typename A2,
typename A3,
typename A4,
typename A5,
typename A6>
class RunnableAdapter<R (T::*)(A1, A2, A3, A4, A5, A6) const> {
public:
typedef R(RunType)(const T*, A1, A2, A3, A4, A5, A6);
typedef true_type IsMethod;
explicit RunnableAdapter(R (T::*method)(A1, A2, A3, A4, A5, A6) const)
: method_(method) {}
R Run(const T* object,
typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2,
typename CallbackParamTraits<A3>::ForwardType a3,
typename CallbackParamTraits<A4>::ForwardType a4,
typename CallbackParamTraits<A5>::ForwardType a5,
typename CallbackParamTraits<A6>::ForwardType a6) {
return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
CallbackForward(a3), CallbackForward(a4),
CallbackForward(a5), CallbackForward(a6));
}
private:
R (T::*method_)(A1, A2, A3, A4, A5, A6) const;
};
// Function: Arity 7.
template <typename R,
typename A1,
typename A2,
typename A3,
typename A4,
typename A5,
typename A6,
typename A7>
class RunnableAdapter<R (*)(A1, A2, A3, A4, A5, A6, A7)> {
public:
typedef R(RunType)(A1, A2, A3, A4, A5, A6, A7);
explicit RunnableAdapter(R (*function)(A1, A2, A3, A4, A5, A6, A7))
: function_(function) {}
R Run(typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2,
typename CallbackParamTraits<A3>::ForwardType a3,
typename CallbackParamTraits<A4>::ForwardType a4,
typename CallbackParamTraits<A5>::ForwardType a5,
typename CallbackParamTraits<A6>::ForwardType a6,
typename CallbackParamTraits<A7>::ForwardType a7) {
return function_(CallbackForward(a1), CallbackForward(a2),
CallbackForward(a3), CallbackForward(a4),
CallbackForward(a5), CallbackForward(a6),
CallbackForward(a7));
}
private:
R (*function_)(A1, A2, A3, A4, A5, A6, A7);
};
// Method: Arity 7.
template <typename R,
typename T,
typename A1,
typename A2,
typename A3,
typename A4,
typename A5,
typename A6,
typename A7>
class RunnableAdapter<R (T::*)(A1, A2, A3, A4, A5, A6, A7)> {
public:
typedef R(RunType)(T*, A1, A2, A3, A4, A5, A6, A7);
typedef true_type IsMethod;
explicit RunnableAdapter(R (T::*method)(A1, A2, A3, A4, A5, A6, A7))
: method_(method) {}
R Run(T* object,
typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2,
typename CallbackParamTraits<A3>::ForwardType a3,
typename CallbackParamTraits<A4>::ForwardType a4,
typename CallbackParamTraits<A5>::ForwardType a5,
typename CallbackParamTraits<A6>::ForwardType a6,
typename CallbackParamTraits<A7>::ForwardType a7) {
return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
CallbackForward(a3), CallbackForward(a4),
CallbackForward(a5), CallbackForward(a6),
CallbackForward(a7));
}
private:
R (T::*method_)(A1, A2, A3, A4, A5, A6, A7);
};
// Const Method: Arity 7.
template <typename R,
typename T,
typename A1,
typename A2,
typename A3,
typename A4,
typename A5,
typename A6,
typename A7>
class RunnableAdapter<R (T::*)(A1, A2, A3, A4, A5, A6, A7) const> {
public:
typedef R(RunType)(const T*, A1, A2, A3, A4, A5, A6, A7);
typedef true_type IsMethod;
explicit RunnableAdapter(R (T::*method)(A1, A2, A3, A4, A5, A6, A7) const)
: method_(method) {}
R Run(const T* object,
typename CallbackParamTraits<A1>::ForwardType a1,
typename CallbackParamTraits<A2>::ForwardType a2,
typename CallbackParamTraits<A3>::ForwardType a3,
typename CallbackParamTraits<A4>::ForwardType a4,
typename CallbackParamTraits<A5>::ForwardType a5,
typename CallbackParamTraits<A6>::ForwardType a6,
typename CallbackParamTraits<A7>::ForwardType a7) {
return (object->*method_)(CallbackForward(a1), CallbackForward(a2),
CallbackForward(a3), CallbackForward(a4),
CallbackForward(a5), CallbackForward(a6),
CallbackForward(a7));
}
private:
R (T::*method_)(A1, A2, A3, A4, A5, A6, A7) const;
};
// FunctionTraits<>
//
// Breaks a function signature apart into typedefs for easier introspection.
template <typename Sig>
struct FunctionTraits;
template <typename R>
struct FunctionTraits<R()> {
typedef R ReturnType;
};
template <typename R, typename A1>
struct FunctionTraits<R(A1)> {
typedef R ReturnType;
typedef A1 A1Type;
};
template <typename R, typename A1, typename A2>
struct FunctionTraits<R(A1, A2)> {
typedef R ReturnType;
typedef A1 A1Type;
typedef A2 A2Type;
};
template <typename R, typename A1, typename A2, typename A3>
struct FunctionTraits<R(A1, A2, A3)> {
typedef R ReturnType;
typedef A1 A1Type;
typedef A2 A2Type;
typedef A3 A3Type;
};
template <typename R, typename A1, typename A2, typename A3, typename A4>
struct FunctionTraits<R(A1, A2, A3, A4)> {
typedef R ReturnType;
typedef A1 A1Type;
typedef A2 A2Type;
typedef A3 A3Type;
typedef A4 A4Type;
};
template <typename R,
typename A1,
typename A2,
typename A3,
typename A4,
typename A5>
struct FunctionTraits<R(A1, A2, A3, A4, A5)> {
typedef R ReturnType;
typedef A1 A1Type;
typedef A2 A2Type;
typedef A3 A3Type;
typedef A4 A4Type;
typedef A5 A5Type;
};
template <typename R,
typename A1,
typename A2,
typename A3,
typename A4,
typename A5,
typename A6>
struct FunctionTraits<R(A1, A2, A3, A4, A5, A6)> {
typedef R ReturnType;
typedef A1 A1Type;
typedef A2 A2Type;
typedef A3 A3Type;
typedef A4 A4Type;
typedef A5 A5Type;
typedef A6 A6Type;
};
template <typename R,
typename A1,
typename A2,
typename A3,
typename A4,
typename A5,
typename A6,
typename A7>
struct FunctionTraits<R(A1, A2, A3, A4, A5, A6, A7)> {
typedef R ReturnType;
typedef A1 A1Type;
typedef A2 A2Type;
typedef A3 A3Type;
typedef A4 A4Type;
typedef A5 A5Type;
typedef A6 A6Type;
typedef A7 A7Type;
};
// ForceVoidReturn<>
//
// Set of templates that support forcing the function return type to void.
template <typename Sig>
struct ForceVoidReturn;
template <typename R>
struct ForceVoidReturn<R()> {
typedef void(RunType)();
};
template <typename R, typename A1>
struct ForceVoidReturn<R(A1)> {
typedef void(RunType)(A1);
};
template <typename R, typename A1, typename A2>
struct ForceVoidReturn<R(A1, A2)> {
typedef void(RunType)(A1, A2);
};
template <typename R, typename A1, typename A2, typename A3>
struct ForceVoidReturn<R(A1, A2, A3)> {
typedef void(RunType)(A1, A2, A3);
};
template <typename R, typename A1, typename A2, typename A3, typename A4>
struct ForceVoidReturn<R(A1, A2, A3, A4)> {
typedef void(RunType)(A1, A2, A3, A4);
};
template <typename R,
typename A1,
typename A2,
typename A3,
typename A4,
typename A5>
struct ForceVoidReturn<R(A1, A2, A3, A4, A5)> {
typedef void(RunType)(A1, A2, A3, A4, A5);
};
template <typename R,
typename A1,
typename A2,
typename A3,
typename A4,
typename A5,
typename A6>
struct ForceVoidReturn<R(A1, A2, A3, A4, A5, A6)> {
typedef void(RunType)(A1, A2, A3, A4, A5, A6);
};
template <typename R,
typename A1,
typename A2,
typename A3,
typename A4,
typename A5,
typename A6,
typename A7>
struct ForceVoidReturn<R(A1, A2, A3, A4, A5, A6, A7)> {
typedef void(RunType)(A1, A2, A3, A4, A5, A6, A7);
};
// FunctorTraits<>
//
// See description at top of file.
template <typename T>
struct FunctorTraits {
typedef RunnableAdapter<T> RunnableType;
typedef typename RunnableType::RunType RunType;
};
template <typename T>
struct FunctorTraits<IgnoreResultHelper<T>> {
typedef typename FunctorTraits<T>::RunnableType RunnableType;
typedef
typename ForceVoidReturn<typename RunnableType::RunType>::RunType RunType;
};
template <typename T>
struct FunctorTraits<Callback<T>> {
typedef Callback<T> RunnableType;
typedef typename Callback<T>::RunType RunType;
};
// MakeRunnable<>
//
// Converts a passed in functor to a RunnableType using type inference.
template <typename T>
typename FunctorTraits<T>::RunnableType MakeRunnable(const T& t) {
return RunnableAdapter<T>(t);
}
template <typename T>
typename FunctorTraits<T>::RunnableType MakeRunnable(
const IgnoreResultHelper<T>& t) {
return MakeRunnable(t.functor_);
}
template <typename T>
const typename FunctorTraits<Callback<T>>::RunnableType& MakeRunnable(
const Callback<T>& t) {
DCHECK(!t.is_null());
return t;
}
// InvokeHelper<>
//
// There are 3 logical InvokeHelper<> specializations: normal, void-return,
// WeakCalls.
//
// The normal type just calls the underlying runnable.
//
// We need a InvokeHelper to handle void return types in order to support
// IgnoreResult(). Normally, if the Runnable's RunType had a void return,
// the template system would just accept "return functor.Run()" ignoring
// the fact that a void function is being used with return. This piece of
// sugar breaks though when the Runnable's RunType is not void. Thus, we
// need a partial specialization to change the syntax to drop the "return"
// from the invocation call.
//
// WeakCalls similarly need special syntax that is applied to the first
// argument to check if they should no-op themselves.
template <bool IsWeakCall,
typename ReturnType,
typename Runnable,
typename ArgsType>
struct InvokeHelper;
template <typename ReturnType, typename Runnable>
struct InvokeHelper<false, ReturnType, Runnable, void()> {
static ReturnType MakeItSo(Runnable runnable) { return runnable.Run(); }
};
template <typename Runnable>
struct InvokeHelper<false, void, Runnable, void()> {
static void MakeItSo(Runnable runnable) { runnable.Run(); }
};
template <typename ReturnType, typename Runnable, typename A1>
struct InvokeHelper<false, ReturnType, Runnable, void(A1)> {
static ReturnType MakeItSo(Runnable runnable, A1 a1) {
return runnable.Run(CallbackForward(a1));
}
};
template <typename Runnable, typename A1>
struct InvokeHelper<false, void, Runnable, void(A1)> {
static void MakeItSo(Runnable runnable, A1 a1) {
runnable.Run(CallbackForward(a1));
}
};
template <typename Runnable, typename BoundWeakPtr>
struct InvokeHelper<true, void, Runnable, void(BoundWeakPtr)> {
static void MakeItSo(Runnable runnable, BoundWeakPtr weak_ptr) {
if (!weak_ptr.get()) {
return;
}
runnable.Run(weak_ptr.get());
}
};
template <typename ReturnType, typename Runnable, typename A1, typename A2>
struct InvokeHelper<false, ReturnType, Runnable, void(A1, A2)> {
static ReturnType MakeItSo(Runnable runnable, A1 a1, A2 a2) {
return runnable.Run(CallbackForward(a1), CallbackForward(a2));
}
};
template <typename Runnable, typename A1, typename A2>
struct InvokeHelper<false, void, Runnable, void(A1, A2)> {
static void MakeItSo(Runnable runnable, A1 a1, A2 a2) {
runnable.Run(CallbackForward(a1), CallbackForward(a2));
}
};
template <typename Runnable, typename BoundWeakPtr, typename A2>
struct InvokeHelper<true, void, Runnable, void(BoundWeakPtr, A2)> {
static void MakeItSo(Runnable runnable, BoundWeakPtr weak_ptr, A2 a2) {
if (!weak_ptr.get()) {
return;
}
runnable.Run(weak_ptr.get(), CallbackForward(a2));
}
};
template <typename ReturnType,
typename Runnable,
typename A1,
typename A2,
typename A3>
struct InvokeHelper<false, ReturnType, Runnable, void(A1, A2, A3)> {
static ReturnType MakeItSo(Runnable runnable, A1 a1, A2 a2, A3 a3) {
return runnable.Run(CallbackForward(a1), CallbackForward(a2),
CallbackForward(a3));
}
};
template <typename Runnable, typename A1, typename A2, typename A3>
struct InvokeHelper<false, void, Runnable, void(A1, A2, A3)> {
static void MakeItSo(Runnable runnable, A1 a1, A2 a2, A3 a3) {
runnable.Run(CallbackForward(a1), CallbackForward(a2), CallbackForward(a3));