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https://github.com/qbittorrent/qBittorrent.git
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a22d2f0139
Enums are stored as strings, that improves configuration file readability and maintainability. String values are obtained via QMetaEnum, and since with Qt 5.5 QMetaEnum::fromType() includes a static_assert, this has to be a safe method.
116 lines
3.8 KiB
C++
116 lines
3.8 KiB
C++
/*
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* Bittorrent Client using Qt and libtorrent.
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* Copyright (C) 2016 Vladimir Golovnev <glassez@yandex.ru>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* In addition, as a special exception, the copyright holders give permission to
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* link this program with the OpenSSL project's "OpenSSL" library (or with
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* modified versions of it that use the same license as the "OpenSSL" library),
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* and distribute the linked executables. You must obey the GNU General Public
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* License in all respects for all of the code used other than "OpenSSL". If you
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* modify file(s), you may extend this exception to your version of the file(s),
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* but you are not obligated to do so. If you do not wish to do so, delete this
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* exception statement from your version.
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*/
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#ifndef SETTINGVALUE_H
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#define SETTINGVALUE_H
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#include <functional>
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#include <type_traits>
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#include <QMetaEnum>
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#include <QString>
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#include <QVariant>
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#include "settingsstorage.h"
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template <typename T>
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class CachedSettingValue
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{
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using ProxyFunc = std::function<T (const T&)>;
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public:
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explicit CachedSettingValue(const char *keyName, const T &defaultValue = T())
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: m_keyName(QLatin1String(keyName))
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, m_value(loadValue(defaultValue))
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{
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}
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explicit CachedSettingValue(const char *keyName, const T &defaultValue
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, const ProxyFunc &proxyFunc)
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: m_keyName(QLatin1String(keyName))
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, m_value(proxyFunc(loadValue(defaultValue)))
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{
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}
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T value() const
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{
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return m_value;
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}
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operator T() const
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{
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return value();
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}
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CachedSettingValue<T> &operator=(const T &newValue)
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{
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m_value = newValue;
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storeValue(m_value);
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return *this;
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}
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private:
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// regular load/save pair
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template <typename U, typename std::enable_if<!std::is_enum<U>::value, int>::type = 0>
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U loadValue(const U &defaultValue)
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{
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return SettingsStorage::instance()->loadValue(m_keyName, defaultValue).template value<T>();
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}
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template <typename U, typename std::enable_if<!std::is_enum<U>::value, int>::type = 0>
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void storeValue(const U &value)
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{
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SettingsStorage::instance()->storeValue(m_keyName, value);
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}
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// load/save pair for enum
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// saves literal value of the enum constant, obtained from QMetaEnum
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template <typename U, typename std::enable_if<std::is_enum<U>::value, int>::type = 0>
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U loadValue(const U &defaultValue)
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{
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static_assert(std::is_same<int, typename std::underlying_type<U>::type>::value,
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"Enumeration underlying type has to be int");
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bool ok = false;
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const U res = static_cast<U>(QMetaEnum::fromType<U>().keyToValue(
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SettingsStorage::instance()->loadValue(m_keyName, QString()).toString().toLatin1().constData(), &ok));
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return ok ? res : defaultValue;
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}
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template <typename U, typename std::enable_if<std::is_enum<U>::value, int>::type = 0>
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void storeValue(const U &value)
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{
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SettingsStorage::instance()->storeValue(m_keyName,
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QString::fromLatin1(QMetaEnum::fromType<U>().valueToKey(static_cast<int>(value))));
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}
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const QString m_keyName;
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T m_value;
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};
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#endif // SETTINGVALUE_H
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