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70 lines
1.9 KiB
C++
70 lines
1.9 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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#ifndef ARROW_UTIL_STRING_BUILDER_H
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#define ARROW_UTIL_STRING_BUILDER_H
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#include <memory>
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#include <ostream>
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#include <string>
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#include <utility>
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#include "arrow/util/visibility.h"
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namespace arrow {
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namespace util {
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namespace detail {
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class ARROW_EXPORT StringStreamWrapper {
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public:
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StringStreamWrapper();
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~StringStreamWrapper();
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std::ostream& stream() { return ostream_; }
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std::string str();
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protected:
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std::unique_ptr<std::ostringstream> sstream_;
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std::ostream& ostream_;
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};
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} // namespace detail
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template <typename Head>
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void StringBuilderRecursive(std::ostream& stream, Head&& head) {
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stream << head;
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}
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template <typename Head, typename... Tail>
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void StringBuilderRecursive(std::ostream& stream, Head&& head, Tail&&... tail) {
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StringBuilderRecursive(stream, std::forward<Head>(head));
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StringBuilderRecursive(stream, std::forward<Tail>(tail)...);
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}
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template <typename... Args>
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std::string StringBuilder(Args&&... args) {
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detail::StringStreamWrapper ss;
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StringBuilderRecursive(ss.stream(), std::forward<Args>(args)...);
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return ss.str();
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}
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} // namespace util
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} // namespace arrow
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#endif // ARROW_UTIL_STRING_BUILDER_H
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