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0671fe28bf
Bug: dawn:1480 Change-Id: Ie2ef7860b38d7f350c99cf2c5451299b23413ec6 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/97882 Commit-Queue: Austin Eng <enga@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Loko Kung <lokokung@google.com>
62 lines
2.8 KiB
C++
62 lines
2.8 KiB
C++
// Copyright 2022 The Dawn Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_DAWN_NATIVE_VISITABLEMEMBERS_H_
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#define SRC_DAWN_NATIVE_VISITABLEMEMBERS_H_
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#include "dawn/native/stream/Stream.h"
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// Helper for X macro to declare a visitable member.
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#define DAWN_INTERNAL_VISITABLE_MEMBER_DECL(type, name) type name{};
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// Helper for X macro for visiting a visitable member.
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#define DAWN_INTERNAL_VISITABLE_MEMBER_ARG(type, name) , name
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namespace dawn::native::detail {
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constexpr int kInternalVisitableUnusedForComma = 0;
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} // namespace dawn::native::detail
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// Helper X macro to declare members of a class or struct, along with Visit
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// methods to call a functor for each member.
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// Example usage:
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// #define MEMBERS(X) \
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// X(int, a) \
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// X(float, b) \
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// X(Foo, foo) \
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// X(Bar, bar)
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// struct MyStruct {
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// DAWN_VISITABLE_MEMBERS(MEMBERS)
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// };
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// #undef MEMBERS
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#define DAWN_VISITABLE_MEMBERS(MEMBERS) \
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MEMBERS(DAWN_INTERNAL_VISITABLE_MEMBER_DECL) \
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\
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template <typename V> \
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constexpr auto VisitAll(V&& visit) const { \
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return [&](int, const auto&... ms) { \
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return visit(ms...); \
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}(::dawn::native::detail::kInternalVisitableUnusedForComma MEMBERS( \
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DAWN_INTERNAL_VISITABLE_MEMBER_ARG)); \
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} \
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\
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template <typename V> \
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constexpr auto VisitAll(V&& visit) { \
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return [&](int, auto&... ms) { \
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return visit(ms...); \
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}(::dawn::native::detail::kInternalVisitableUnusedForComma MEMBERS( \
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DAWN_INTERNAL_VISITABLE_MEMBER_ARG)); \
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}
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#endif // SRC_DAWN_NATIVE_VISITABLEMEMBERS_H_
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