| // 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 |
| // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| // 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 "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_ |
