mojo::Callback -> base::Callback

mojo/public/cpp/bindings/lib/callback_internal.h

-// 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_