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79 lines
1.9 KiB
79 lines
1.9 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_NUMERIC_OPERATIONS_H
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#define FRUIT_META_NUMERIC_OPERATIONS_H
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#include <fruit/impl/meta/basics.h>
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namespace fruit {
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namespace impl {
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namespace meta {
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struct Sum {
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template <typename... Ints>
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struct apply;
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template <int n, int m>
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struct apply<Int<n>, Int<m>> {
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using type = Int<n + m>;
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};
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};
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struct SumAll {
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template <typename... Ints>
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struct apply {
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using type = Int<0>;
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};
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template <typename N1, typename... Ints>
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struct apply<N1, Ints...> {
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using type = Int<N1::value + apply<Ints...>::type::value>;
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};
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// Optimization, not required for correctness.
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template <typename N0, typename N1, typename N2, typename N3, typename N4, typename... Ints>
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struct apply<N0, N1, N2, N3, N4, Ints...> {
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using type = Int<N0::value + N1::value + N2::value + N3::value + N4::value + apply<Ints...>::type::value>;
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};
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};
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struct Minus {
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template <typename N, typename M>
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struct apply;
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template <int n, int m>
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struct apply<Int<n>, Int<m>> {
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using type = Int<n - m>;
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};
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};
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struct GreaterThan {
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template <typename N, typename M>
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struct apply;
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template <int n, int m>
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struct apply<Int<n>, Int<m>> {
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using type = Bool<(n > m)>;
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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_NUMERIC_OPERATIONS_H
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