#ifndef SETTING_H_62B23520_7C8E_11DE_8A39_0800200C9A66
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#define SETTING_H_62B23520_7C8E_11DE_8A39_0800200C9A66
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#if defined(_MSC_VER) || \
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(defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || \
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(__GNUC__ >= 4)) // GCC supports "pragma once" correctly since 3.4
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#pragma once
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#endif
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#include <memory>
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#include <vector>
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#include "yaml-cpp/noncopyable.h"
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namespace YAML {
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class SettingChangeBase;
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template <typename T>
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class Setting {
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public:
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Setting() : m_value() {}
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const T get() const { return m_value; }
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std::unique_ptr<SettingChangeBase> set(const T& value);
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void restore(const Setting<T>& oldSetting) { m_value = oldSetting.get(); }
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private:
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T m_value;
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};
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class SettingChangeBase {
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public:
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virtual ~SettingChangeBase() {}
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virtual void pop() = 0;
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};
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template <typename T>
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class SettingChange : public SettingChangeBase {
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public:
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SettingChange(Setting<T>* pSetting) : m_pCurSetting(pSetting) {
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// copy old setting to save its state
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m_oldSetting = *pSetting;
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}
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virtual void pop() { m_pCurSetting->restore(m_oldSetting); }
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private:
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Setting<T>* m_pCurSetting;
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Setting<T> m_oldSetting;
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};
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template <typename T>
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inline std::unique_ptr<SettingChangeBase> Setting<T>::set(const T& value) {
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std::unique_ptr<SettingChangeBase> pChange(new SettingChange<T>(this));
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m_value = value;
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return pChange;
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}
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class SettingChanges : private noncopyable {
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public:
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SettingChanges() {}
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~SettingChanges() { clear(); }
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void clear() {
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restore();
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m_settingChanges.clear();
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}
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void restore() {
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for (setting_changes::const_iterator it = m_settingChanges.begin();
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it != m_settingChanges.end(); ++it)
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(*it)->pop();
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}
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void push(std::unique_ptr<SettingChangeBase> pSettingChange) {
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m_settingChanges.push_back(std::move(pSettingChange));
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}
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// like std::unique_ptr - assignment is transfer of ownership
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SettingChanges& operator=(SettingChanges&& rhs) {
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if (this == &rhs)
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return *this;
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clear();
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std::swap(m_settingChanges, rhs.m_settingChanges);
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return *this;
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}
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private:
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typedef std::vector<std::unique_ptr<SettingChangeBase>> setting_changes;
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setting_changes m_settingChanges;
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};
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}
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#endif // SETTING_H_62B23520_7C8E_11DE_8A39_0800200C9A66
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