60 lines
1.3 KiB
C++
60 lines
1.3 KiB
C++
#ifndef PFOR_PFOR_TUPLE_VIEW_H
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#define PFOR_PFOR_TUPLE_VIEW_H
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#include <cstdio>
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#include <tuple>
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#include "mp/meta.h"
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#include "mp/pack.h"
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namespace pfor {
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template<typename, typename> class TupleView;
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template<typename... Ts, std::size_t... indices>
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class TupleView<std::tuple<Ts...>, Pack<UIntToType<indices>...>> {
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public:
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using Tuple = std::tuple<Ts...>;
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using View = Pack<UIntToType<indices>...>;
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private:
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Tuple& _tuple;
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public:
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TupleView(Tuple& tuple): _tuple{tuple} {}
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template<std::size_t index>
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decltype(auto) get() {
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return std::get<PackGet<View, index>::value>(_tuple);
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}
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template<std::size_t index>
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decltype(auto) get() const {
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return std::get<PackGet<View, index>::value>(_tuple);
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}
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};
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template<typename... Ts, std::size_t... indices>
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auto makeTupleView(std::tuple<Ts...>& tuple, Pack<UIntToType<indices>...>) {
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return TupleView<std::tuple<Ts...>, Pack<UIntToType<indices>...>>{tuple};
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}
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}
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namespace std {
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template<std::size_t index, typename Tuple, typename View>
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constexpr decltype(auto) get(pfor::TupleView<Tuple, View>& tupleView) {
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return tupleView.template get<index>();
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}
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template<std::size_t index, typename Tuple, typename View>
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constexpr decltype(auto) get(pfor::TupleView<Tuple, View> const& tupleView) {
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return tupleView.template get<index>();
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}
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}
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#endif
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