| // Copyright (c) 2018 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 QUICHE_QUIC_CORE_FRAMES_QUIC_INLINED_FRAME_H_ |
| #define QUICHE_QUIC_CORE_FRAMES_QUIC_INLINED_FRAME_H_ |
| |
| #include <type_traits> |
| |
| #include "quic/core/quic_types.h" |
| #include "quic/platform/api/quic_export.h" |
| |
| namespace quic { |
| |
| // QuicInlinedFrame is the base class of all frame types that is inlined in the |
| // QuicFrame class. It gurantees all inlined frame types contain a 'type' field |
| // at offset 0, such that QuicFrame.type can get the correct frame type for both |
| // inline and out-of-line frame types. |
| template <typename DerivedT> |
| struct QUIC_EXPORT_PRIVATE QuicInlinedFrame { |
| QuicInlinedFrame(QuicFrameType type) { |
| static_cast<DerivedT*>(this)->type = type; |
| static_assert(std::is_standard_layout<DerivedT>::value, |
| "Inlined frame must have a standard layout"); |
| static_assert(offsetof(DerivedT, type) == 0, |
| "type must be the first field."); |
| static_assert(sizeof(DerivedT) <= 24, |
| "Frames larger than 24 bytes should not be inlined."); |
| } |
| }; |
| |
| } // namespace quic |
| |
| #endif // QUICHE_QUIC_CORE_FRAMES_QUIC_INLINED_FRAME_H_ |