mirror of
https://github.com/aykhans/AzSuicideDataVisualization.git
synced 2025-04-22 18:32:15 +00:00
85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
// 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>
|
|
|
|
#pragma once
|
|
|
|
#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();
|
|
}
|
|
|
|
/// CRTP helper for declaring string representation. Defines operator<<
|
|
template <typename T>
|
|
class ToStringOstreamable {
|
|
public:
|
|
~ToStringOstreamable() {
|
|
static_assert(
|
|
std::is_same<decltype(std::declval<const T>().ToString()), std::string>::value,
|
|
"ToStringOstreamable depends on the method T::ToString() const");
|
|
}
|
|
|
|
private:
|
|
const T& cast() const { return static_cast<const T&>(*this); }
|
|
|
|
friend inline std::ostream& operator<<(std::ostream& os, const ToStringOstreamable& t) {
|
|
return os << t.cast().ToString();
|
|
}
|
|
};
|
|
|
|
} // namespace util
|
|
} // namespace arrow
|