78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License. template <typename T>
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#pragma once
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#include <tuple>
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#include "arrow/util/string.h"
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using arrow::internal::ToChars;
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namespace arrow {
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namespace internal {
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namespace detail {
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template <typename OStream, typename Tuple, size_t N>
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struct TuplePrinter {
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static void Print(OStream* os, const Tuple& t) {
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TuplePrinter<OStream, Tuple, N - 1>::Print(os, t);
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*os << std::get<N - 1>(t);
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}
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};
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template <typename OStream, typename Tuple>
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struct TuplePrinter<OStream, Tuple, 0> {
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static void Print(OStream* os, const Tuple& t) {}
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};
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} // namespace detail
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// Print elements from a tuple to a stream, in order.
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// Typical use is to pack a bunch of existing values with std::forward_as_tuple()
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// before passing it to this function.
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template <typename OStream, typename... Args>
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void PrintTuple(OStream* os, const std::tuple<Args&...>& tup) {
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detail::TuplePrinter<OStream, std::tuple<Args&...>, sizeof...(Args)>::Print(os, tup);
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}
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template <typename Range, typename Separator>
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struct PrintVector {
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const Range& range_;
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const Separator& separator_;
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template <typename Os> // template to dodge inclusion of <ostream>
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friend Os& operator<<(Os& os, PrintVector l) {
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bool first = true;
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os << "[";
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for (const auto& element : l.range_) {
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if (first) {
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first = false;
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} else {
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os << l.separator_;
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}
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os << ToChars(element); // use ToChars to avoid locale dependence
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}
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os << "]";
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return os;
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}
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};
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template <typename Range, typename Separator>
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PrintVector(const Range&, const Separator&) -> PrintVector<Range, Separator>;
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} // namespace internal
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} // namespace arrow
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