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125 lines
5.0 KiB
125 lines
5.0 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_FOLD_H
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#define FRUIT_META_FOLD_H
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#include <functional>
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namespace fruit {
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namespace impl {
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namespace meta {
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struct Fold {
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template <typename F, typename InitialValue, typename... Types>
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struct apply;
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template <typename F, typename InitialValue>
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struct apply<F, InitialValue> {
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using type = InitialValue;
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};
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template <typename F, typename InitialValue, typename T0>
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struct apply<F, InitialValue, T0> {
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using type = typename F::template apply<InitialValue, T0>::type;
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};
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template <typename F, typename InitialValue, typename T0, typename T1>
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struct apply<F, InitialValue, T0, T1> {
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using type =
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typename F::template apply<typename DoEval<typename F::template apply<InitialValue, T0>::type>::type, T1>::type;
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};
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template <typename F, typename InitialValue, typename T0, typename T1, typename T2>
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struct apply<F, InitialValue, T0, T1, T2> {
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using type = typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<InitialValue, T0>::type>::type, T1>::type>::type,
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T2>::type;
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};
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template <typename F, typename InitialValue, typename T0, typename T1, typename T2, typename T3>
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struct apply<F, InitialValue, T0, T1, T2, T3> {
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using type = typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<InitialValue, T0>::type>::type, T1>::type>::type,
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T2>::type>::type,
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T3>::type;
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};
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template <typename F, typename InitialValue, typename T0, typename T1, typename T2, typename T3, typename T4>
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struct apply<F, InitialValue, T0, T1, T2, T3, T4> {
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using type = typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<InitialValue, T0>::type>::type, T1>::type>::type,
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T2>::type>::type,
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T3>::type>::type,
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T4>::type;
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};
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template <typename F, typename InitialValue, typename T0, typename T1, typename T2, typename T3, typename T4,
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typename... Types>
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struct apply<F, InitialValue, T0, T1, T2, T3, T4, Types...> {
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using type = Fold(
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F, typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<InitialValue, T0>::type>::type, T1>::type>::type,
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T2>::type>::type,
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T3>::type>::type,
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T4>::type,
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Types...);
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};
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// Optimized specialization, processing 10 values at a time.
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template <typename F, typename InitialValue, typename T0, typename T1, typename T2, typename T3, typename T4,
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typename T5, typename T6, typename T7, typename T8, typename T9, typename... Types>
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struct apply<F, InitialValue, T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, Types...> {
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using type = Fold(
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F,
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typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<
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typename DoEval<typename F::template apply<InitialValue, T0>::type>::type,
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T1>::type>::type,
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T2>::type>::type,
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T3>::type>::type,
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T4>::type>::type,
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T5>::type>::type,
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T6>::type>::type,
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T7>::type>::type,
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T8>::type>::type,
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T9>::type,
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Types...);
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};
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};
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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_FOLD_H
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