1 // Copyright (c) 2018 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef QUICHE_QUIC_CORE_FRAMES_QUIC_INLINED_FRAME_H_ 6 #define QUICHE_QUIC_CORE_FRAMES_QUIC_INLINED_FRAME_H_ 7 8 #include <type_traits> 9 10 #include "quiche/quic/core/quic_types.h" 11 #include "quiche/quic/platform/api/quic_export.h" 12 13 namespace quic { 14 15 // QuicInlinedFrame is the base class of all frame types that is inlined in the 16 // QuicFrame class. It gurantees all inlined frame types contain a 'type' field 17 // at offset 0, such that QuicFrame.type can get the correct frame type for both 18 // inline and out-of-line frame types. 19 template <typename DerivedT> 20 struct QUIC_EXPORT_PRIVATE QuicInlinedFrame { QuicInlinedFrameQuicInlinedFrame21 QuicInlinedFrame(QuicFrameType type) { 22 static_cast<DerivedT*>(this)->type = type; 23 static_assert(std::is_standard_layout<DerivedT>::value, 24 "Inlined frame must have a standard layout"); 25 static_assert(offsetof(DerivedT, type) == 0, 26 "type must be the first field."); 27 static_assert(sizeof(DerivedT) <= 24, 28 "Frames larger than 24 bytes should not be inlined."); 29 } 30 }; 31 32 } // namespace quic 33 34 #endif // QUICHE_QUIC_CORE_FRAMES_QUIC_INLINED_FRAME_H_ 35