47 lines
1.6 KiB
C++
47 lines
1.6 KiB
C++
/*
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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_CALL_WITH_TUPLE_H
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#define FRUIT_CALL_WITH_TUPLE_H
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#include <fruit/impl/meta/vector.h>
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namespace fruit {
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namespace impl {
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template <typename IntVector, typename Result, typename ArgsTuple>
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struct CallWithTupleHelper;
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template <typename... Ints, typename Result, typename... Args>
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struct CallWithTupleHelper<fruit::impl::meta::Vector<Ints...>, Result, std::tuple<Args...>> {
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Result operator()(Result (*fun)(Args...), std::tuple<Args...> args) {
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// This parameter *is* used, but when the tuple is empty some compilers report is as unused.
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(void)args;
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return fun(std::get<fruit::impl::meta::getIntValue<Ints>()>(args)...);
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}
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};
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template <typename Result, typename... Args>
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inline Result callWithTuple(Result (*fun)(Args...), std::tuple<Args...> args) {
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using IntVector =
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fruit::impl::meta::Eval<fruit::impl::meta::GenerateIntSequence(fruit::impl::meta::Int<sizeof...(Args)>)>;
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return CallWithTupleHelper<IntVector, Result, std::tuple<Args...>>()(fun, args);
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}
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}
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}
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#endif // FRUIT_CALL_WITH_TUPLE_H
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