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