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// Copyright 2014 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.
#ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_CALLBACK_INTERNAL_H_
#define MOJO_PUBLIC_CPP_BINDINGS_LIB_CALLBACK_INTERNAL_H_
#include "mojo/public/cpp/bindings/lib/template_util.h"
namespace mojo {
class String;
namespace internal {
template <typename T>
struct Callback_ParamTraits {
typedef T ForwardType;
};
template <>
struct Callback_ParamTraits<String> {
typedef const String& ForwardType;
};
template <typename T, typename... Args>
struct HasCompatibleCallOperator {
// This template's second parameter is the signature of the operator()
// overload we want to try to detect:
// void operator()(Args...) const;
template <typename U,
void (U::*)(
typename internal::Callback_ParamTraits<Args>::ForwardType...)
const>
struct TestType {};
// This matches type U if it has a call operator with the
// expected signature.
template <typename U>
static YesType Test(TestType<U, &U::operator()>*);
// This matches anything else.
template <typename U>
static NoType Test(...);
// HasCompatibleCallOperator<T, Args...>::value will be true if T has a
// compatible call operator.
enum { value = (sizeof(Test<T>(nullptr)) == sizeof(YesType)) };
};
} // namespace internal
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_CALLBACK_INTERNAL_H_
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