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// Copyright 2022 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SRC_DAWN_NATIVE_SERIALIZABLE_H_
#define SRC_DAWN_NATIVE_SERIALIZABLE_H_
#include <utility>
#include "dawn/native/VisitableMembers.h"
#include "dawn/native/stream/BlobSource.h"
#include "dawn/native/stream/ByteVectorSink.h"
#include "dawn/native/stream/Stream.h"
namespace dawn::native {
// Base CRTP for implementing StreamIn/StreamOut/FromBlob/ToBlob for Derived,
// assuming Derived has VisitAll methods provided by DAWN_VISITABLE_MEMBERS.
template <typename Derived>
class Serializable {
public:
friend void StreamIn(stream::Sink* s, const Derived& in) {
in.VisitAll([&](const auto&... members) { StreamIn(s, members...); });
}
friend MaybeError StreamOut(stream::Source* s, Derived* out) {
return out->VisitAll([&](auto&... members) { return StreamOut(s, &members...); });
}
static ResultOrError<Derived> FromBlob(Blob blob) {
stream::BlobSource source(std::move(blob));
Derived out;
DAWN_TRY(StreamOut(&source, &out));
return out;
}
Blob ToBlob() const {
stream::ByteVectorSink sink;
StreamIn(&sink, static_cast<const Derived&>(*this));
return CreateBlob(std::move(sink));
}
};
} // namespace dawn::native
// Helper macro to define a struct or class along with VisitAll methods to call
// a functor on all members. Derives from Visitable which provides
// implementations of StreamIn/StreamOut/FromBlob/ToBlob.
// Example usage:
// #define MEMBERS(X) \
// X(int, a) \
// X(float, b) \
// X(Foo, foo) \
// X(Bar, bar)
// DAWN_SERIALIZABLE(struct, MyStruct, MEMBERS) {
// void SomeAdditionalMethod();
// };
// #undef MEMBERS
#define DAWN_SERIALIZABLE(qualifier, Name, MEMBERS) \
struct Name##__Contents { \
DAWN_VISITABLE_MEMBERS(MEMBERS) \
}; \
qualifier Name : Name##__Contents, public ::dawn::native::Serializable<Name>
#endif // SRC_DAWN_NATIVE_SERIALIZABLE_H_