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Copy pathstring_builder.h
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69 lines (55 loc) · 1.94 KB
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License. template <typename T>
#ifndef ARROW_UTIL_STRING_BUILDER_H
#define ARROW_UTIL_STRING_BUILDER_H
#include <memory>
#include <ostream>
#include <string>
#include <utility>
#include "arrow/util/visibility.h"
namespace arrow {
namespace util {
namespace detail {
class ARROW_EXPORT StringStreamWrapper {
public:
StringStreamWrapper();
~StringStreamWrapper();
std::ostream& stream() { return ostream_; }
std::string str();
protected:
std::unique_ptr<std::ostringstream> sstream_;
std::ostream& ostream_;
};
} // namespace detail
template <typename Head>
void StringBuilderRecursive(std::ostream& stream, Head&& head) {
stream << head;
}
template <typename Head, typename... Tail>
void StringBuilderRecursive(std::ostream& stream, Head&& head, Tail&&... tail) {
StringBuilderRecursive(stream, std::forward<Head>(head));
StringBuilderRecursive(stream, std::forward<Tail>(tail)...);
}
template <typename... Args>
std::string StringBuilder(Args&&... args) {
detail::StringStreamWrapper ss;
StringBuilderRecursive(ss.stream(), std::forward<Args>(args)...);
return ss.str();
}
} // namespace util
} // namespace arrow
#endif // ARROW_UTIL_STRING_BUILDER_H