forked from qt-creator/qt-creator
Utils: Add SmallString
SmallString is a very simple utf8 string class. It's purpose is performance. It uses a short string opimization which provides 31 bytes of heap free memory to save a 30 bytes long string plus null terminator. If the string gets larger heap is allocated. The grow strategy is 1.5 to improve reuse of allocated memory. It uses optionally constexpr to provide string literals. Change-Id: I7757fb51abfeca200d074cbfce2f1d99edc0ecb0 Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>
This commit is contained in:
Marco Bubke
255
src/libs/utils/smallstringvector.h
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255
src/libs/utils/smallstringvector.h
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/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of Qt Creator.
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**
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 as published by the Free Software
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** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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****************************************************************************/
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#pragma once
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#include "utils_global.h"
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#include "smallstring.h"
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#include <vector>
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#pragma push_macro("noexcept")
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#ifndef __cpp_noexcept
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#define noexcept
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#endif
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namespace Utils {
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class SmallStringVector : public std::vector<Utils::SmallString>
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{
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public:
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SmallStringVector() = default;
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SmallStringVector(std::initializer_list<Utils::SmallString> list)
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{
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reserve(list.size());
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for (auto &&entry : list)
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push_back(entry.clone());
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}
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explicit SmallStringVector(const QStringList &stringList)
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{
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reserve(std::size_t(stringList.count()));
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for (const QString &string : stringList)
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push_back(Utils::SmallString::fromQString(string));
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}
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#if !defined(UNIT_TESTS) && !(defined(_MSC_VER) && _MSC_VER < 1900)
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SmallStringVector(const SmallStringVector &) = delete;
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SmallStringVector &operator=(const SmallStringVector &) = delete;
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#else
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SmallStringVector(const SmallStringVector &) = default;
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SmallStringVector &operator=(const SmallStringVector &) = default;
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#endif
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#if !(defined(_MSC_VER) && _MSC_VER < 1900)
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SmallStringVector(SmallStringVector &&) noexcept = default;
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SmallStringVector &operator=(SmallStringVector &&) noexcept = default;
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#else
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SmallStringVector(SmallStringVector &&other)
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: std::vector<Utils::SmallString>(std::move(other))
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{
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}
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SmallStringVector &operator=(SmallStringVector &&other)
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{
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std::vector<Utils::SmallString>(std::move(other));
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return *this;
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}
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#endif
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Utils::SmallString join(Utils::SmallString &&separator) const
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{
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Utils::SmallString joinedString;
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joinedString.reserve(totalByteSize() + separator.size() * std::size_t(size()));
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for (auto stringIterator = begin(); stringIterator != end(); ++stringIterator) {
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joinedString.append(*stringIterator);
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if (std::next(stringIterator) != end())
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joinedString.append(separator);
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}
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return joinedString;
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}
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bool contains(const Utils::SmallString &string) const noexcept
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{
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return std::find(cbegin(), cend(), string) != cend();
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}
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bool removeFast(Utils::SmallStringView valueToBeRemoved)
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{
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auto position = std::remove(begin(), end(), valueToBeRemoved);
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const bool hasEntry = position != end();
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erase(position, end());
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return hasEntry;
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}
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void append(Utils::SmallString &&string)
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{
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push_back(std::move(string));
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}
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SmallStringVector clone() const
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{
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SmallStringVector clonedVector;
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clonedVector.reserve(size());
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for (auto &&entry : *this)
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clonedVector.push_back(entry.clone());
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return clonedVector;
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}
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private:
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std::size_t totalByteSize() const
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{
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std::size_t totalSize = 0;
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for (auto &&string : *this)
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totalSize += string.size();
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return totalSize;
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}
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};
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template <typename Type>
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std::vector<Type> clone(const std::vector<Type> &vector)
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{
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std::vector<Type> clonedVector;
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clonedVector.reserve(vector.size());
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for (auto &&entry : vector)
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clonedVector.push_back(entry.clone());
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return clonedVector;
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}
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inline QDataStream &operator<<(QDataStream &out, const SmallStringVector &stringVector)
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{
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out << quint64(stringVector.size());
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for (auto &&string : stringVector)
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out << string;
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return out;
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}
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inline QDataStream &operator>>(QDataStream &in, SmallStringVector &stringVector)
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{
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stringVector.clear();
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quint64 size;
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in >> size;
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stringVector.reserve(size);
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for (quint64 i = 0; i < size; ++i) {
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SmallString string;
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in >> string;
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stringVector.push_back(std::move(string));
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}
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return in;
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}
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inline QDebug operator<<(QDebug debug, const SmallStringVector &stringVector)
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{
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debug << "StringVector(" << stringVector.join(Utils::SmallString(", ")).constData() << ")";
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return debug;
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}
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inline void PrintTo(const SmallStringVector &textVector, ::std::ostream* os)
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{
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*os << "StringVector(" << textVector.join(Utils::SmallString(", ")).constData() << ")";
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}
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} // namespace Utils;
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namespace std {
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template<typename Type>
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QDataStream &operator<<(QDataStream &out, const vector<Type> &vector)
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{
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out << quint64(vector.size());
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for (auto &&entry : vector)
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out << entry;
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return out;
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}
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template<typename Type>
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QDataStream &operator>>(QDataStream &in, vector<Type> &vector)
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{
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vector.clear();
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quint64 size;
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in >> size;
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vector.reserve(size);
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for (quint64 i = 0; i < size; ++i) {
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Type entry;
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in >> entry;
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vector.push_back(move(entry));
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}
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return in;
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}
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} // namespace std
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QT_BEGIN_NAMESPACE
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template<typename Type>
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QDebug &operator<<(QDebug &debug, const std::vector<Type> &vector)
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{
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debug.noquote() << "[";
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for (auto &&entry : vector)
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debug.noquote() << entry << ", ";
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debug.noquote() << "]";
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return debug;
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}
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QT_END_NAMESPACE
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#pragma pop_macro("noexcept")
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