| // Copyright 2022 The Dawn & Tint Authors | |
| // | |
| // Redistribution and use in source and binary forms, with or without | |
| // modification, are permitted provided that the following conditions are met: | |
| // | |
| // 1. Redistributions of source code must retain the above copyright notice, this | |
| // list of conditions and the following disclaimer. | |
| // | |
| // 2. Redistributions in binary form must reproduce the above copyright notice, | |
| // this list of conditions and the following disclaimer in the documentation | |
| // and/or other materials provided with the distribution. | |
| // | |
| // 3. Neither the name of the copyright holder nor the names of its | |
| // contributors may be used to endorse or promote products derived from | |
| // this software without specific prior written permission. | |
| // | |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE | |
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| // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |
| // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| #ifndef SRC_DAWN_NATIVE_VISITABLE_H_ | |
| #define SRC_DAWN_NATIVE_VISITABLE_H_ | |
| #include <utility> | |
| #include "src/dawn/native/stream/BlobSource.h" | |
| #include "src/dawn/native/stream/ByteVectorSink.h" | |
| #include "src/dawn/native/stream/Stream.h" | |
| // Helper for X macro to declare a visitable member. | |
| #define DAWN_INTERNAL_VISITABLE_MEMBER_DECL(type, name, ...) type name{__VA_OPT__(__VA_ARGS__)}; | |
| // 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, 42.0) \ | |
| // X(Foo, foo, kFoo) \ | |
| // 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_ |