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648bd7b4be
This uses template and macro magic to reflect the fields of a class. Dawn: * Reflect the fields of the types that are used by Dawn's stream::Stream<T> specializations, and use tint::ForeachField() to call StreamIn(). Fuzzers: * Replace tint::fuzzers::DataBuilder::BuildImpl<T> specializations with the new reflection system. * static_assert that the type is either POD or reflected. Add a specialization for std::optional which was missing. Move tint::transform::BindingPoints into MultiplanarExternalTexture, as this is only used by MultiplanarExternalTexture. All this reduces fragility of the struct declarations slipping out of sync with the uses. Bug: tint:1640 Change-Id: I08729c1c356f1b427e85983efe3c2678fc2ce717 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/101001 Reviewed-by: Antonio Maiorano <amaiorano@google.com> Commit-Queue: Ben Clayton <bclayton@chromium.org>
68 lines
2.5 KiB
C++
68 lines
2.5 KiB
C++
// Copyright 2022 The Tint 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_TINT_REFLECTION_H_
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#define SRC_TINT_REFLECTION_H_
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#include "src/tint/traits.h"
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#include "src/tint/utils/concat.h"
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#include "src/tint/utils/foreach_macro.h"
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namespace tint {
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namespace detail {
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/// Helper for detecting whether the type T contains a nested Reflection class.
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template <typename T, typename ENABLE = void>
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struct HasReflection : std::false_type {};
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/// Specialization for types that have a nested Reflection class.
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template <typename T>
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struct HasReflection<T, std::void_t<typename T::Reflection>> : std::true_type {};
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} // namespace detail
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/// Is true if the class T has reflected its fields with TINT_REFLECT()
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template <typename T>
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static constexpr bool HasReflection = detail::HasReflection<T>::value;
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/// Calls @p callback with each field of @p object
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/// @param object the object
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/// @param callback a function that is called for each field of @p object.
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/// @tparam CB a function with the signature `void(FIELD)`
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template <typename OBJECT, typename CB>
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void ForeachField(OBJECT&& object, CB&& callback) {
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using T = std::decay_t<OBJECT>;
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static_assert(HasReflection<T>, "object type requires a tint::Reflect<> specialization");
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T::Reflection::Fields(object, callback);
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}
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/// Macro used by TINT_FOREACH() in TINT_REFLECT() to call the callback function with each field in
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/// the variadic.
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#define TINT_REFLECT_CALLBACK_FIELD(field) callback(object.field);
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// TINT_REFLECT(...) reflects each of the fields arguments so that the types can be used with
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// tint::ForeachField().
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#define TINT_REFLECT(...) \
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struct Reflection { \
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template <typename OBJECT, typename CB> \
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static void Fields(OBJECT&& object, CB&& callback) { \
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TINT_FOREACH(TINT_REFLECT_CALLBACK_FIELD, __VA_ARGS__) \
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} \
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}
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} // namespace tint
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#endif // SRC_TINT_REFLECTION_H_
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