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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_VISITABLE_H_
#define SRC_DAWN_NATIVE_VISITABLE_H_
#include <utility>
#include "dawn/native/stream/BlobSource.h"
#include "dawn/native/stream/ByteVectorSink.h"
#include "dawn/native/stream/Stream.h"
// Helper for X macro to declare a visitable member.
#define DAWN_INTERNAL_VISITABLE_MEMBER_DECL(type, name) type name{};
// Helper for X macro for visiting a visitable member.
#define DAWN_INTERNAL_VISITABLE_MEMBER_ARG(type, name) , name
namespace dawn::native::detail {
constexpr int kInternalVisitableUnusedForComma = 0;
} // namespace dawn::native::detail
// Helper X macro to declare members of a class or struct, along with VisitAll
// methods to call a functor on all members.
// Example usage:
// #define MEMBERS(X) \
// X(int, a) \
// X(float, b) \
// X(Foo, foo) \
// X(Bar, bar)
// struct MyStruct {
// DAWN_VISITABLE_MEMBERS(MEMBERS)
// };
// #undef MEMBERS
#define DAWN_VISITABLE_MEMBERS(MEMBERS) \
MEMBERS(DAWN_INTERNAL_VISITABLE_MEMBER_DECL) \
\
template <typename V> \
constexpr auto VisitAll(V&& visit) const { \
return [&](int, const auto&... ms) { \
return visit(ms...); \
}(::dawn::native::detail::kInternalVisitableUnusedForComma MEMBERS( \
DAWN_INTERNAL_VISITABLE_MEMBER_ARG)); \
} \
\
template <typename V> \
constexpr auto VisitAll(V&& visit) { \
return [&](int, auto&... ms) { \
return visit(ms...); \
}(::dawn::native::detail::kInternalVisitableUnusedForComma MEMBERS( \
DAWN_INTERNAL_VISITABLE_MEMBER_ARG)); \
}
#endif // SRC_DAWN_NATIVE_VISITABLE_H_