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75 lines
2.1 KiB
75 lines
2.1 KiB
/*
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* Copyright 2014 Google Inc. All rights reserved.
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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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*/
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#ifndef FRUIT_META_ALGOS_H
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#define FRUIT_META_ALGOS_H
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#include <fruit/impl/fruit-config.h>
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#include <fruit/impl/meta/immutable_map.h>
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namespace fruit {
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namespace impl {
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namespace meta {
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// We need a different (slower) implementation to workaround a Clang bug:
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// https://llvm.org/bugs/show_bug.cgi?id=25669
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// TODO: remove this once that bug is fixed (for the appropriate Clang versions).
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#if FRUIT_HAS_CLANG_ARBITRARY_OVERLOAD_RESOLUTION_BUG
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struct HasDuplicatesHelper {
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template <typename... Types>
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struct apply {
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using type = Bool<false>;
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};
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template <typename Type, typename... Types>
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struct apply<Type, Types...> {
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using type = Or(StaticOr<std::is_same<Type, Types>::value...>, Id<HasDuplicatesHelper(Types...)>);
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};
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};
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struct HasDuplicates {
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template <typename V>
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struct apply;
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template <typename... Types>
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struct apply<Vector<Types...>> {
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using type = HasDuplicatesHelper(Types...);
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};
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};
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#else // !FRUIT_HAS_CLANG_ARBITRARY_OVERLOAD_RESOLUTION_BUG
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// Checks if the given Vector has duplicated types.
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struct HasDuplicates {
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template <typename V>
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struct apply;
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template <typename... Types>
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struct apply<Vector<Types...>> {
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using M = VectorsToImmutableMap(Vector<Types...>, GenerateIntSequence(Int<sizeof...(Types)>));
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using type = Not(StaticAnd<Eval<ImmutableMapContainsKey(M, Types)>::value...>);
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};
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};
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#endif // FRUIT_HAS_CLANG_ARBITRARY_OVERLOAD_RESOLUTION_BUG
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} // namespace meta
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} // namespace impl
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} // namespace fruit
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#endif // FRUIT_META_ALGOS_H
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