chromium/third_party/webrtc/rtc_base/untyped_function.h

/*
 *  Copyright 2020 The WebRTC Project Authors. All rights reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef RTC_BASE_UNTYPED_FUNCTION_H_
#define RTC_BASE_UNTYPED_FUNCTION_H_

#include <cstddef>
#include <cstring>
#include <memory>
#include <type_traits>
#include <utility>

#include "rtc_base/system/assume.h"

namespace webrtc {
namespace webrtc_function_impl {

FunVoid;

// Inline storage size is this many machine words.
enum : size_t { … };

VoidUnion;

// Returns the number of elements of the `inline_storage` array required to
// store an object of type T.
template <typename T>
constexpr size_t InlineStorageSize() { … }

template <typename T>
struct CallHelpers;
CallHelpers<RetT (ArgT...)>;

}  // namespace webrtc_function_impl

// A class that holds (and owns) any callable. The same function call signature
// must be provided when constructing and calling the object.
//
// The point of not having the call signature as a class template parameter is
// to have one single concrete type for all signatures; this reduces binary
// size.
class UntypedFunction final { … };

}  // namespace webrtc

#endif  // RTC_BASE_UNTYPED_FUNCTION_H_