| #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 |