101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
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#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 "yaml-cpp/noexcept.h"
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#include <memory>
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#include <utility>
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#include <vector>
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namespace YAML {
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class SettingChangeBase {
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public:
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virtual ~SettingChangeBase() = default;
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virtual void pop() = 0;
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};
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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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Setting(const T& value) : m_value() { set(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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template <typename T>
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class SettingChange : public SettingChangeBase {
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public:
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SettingChange(Setting<T>* pSetting)
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: m_pCurSetting(pSetting),
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m_oldSetting(*pSetting) // copy old setting to save its state
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{}
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SettingChange(const SettingChange&) = delete;
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SettingChange(SettingChange&&) = delete;
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SettingChange& operator=(const SettingChange&) = delete;
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SettingChange& operator=(SettingChange&&) = delete;
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void pop() override { 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 {
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public:
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SettingChanges() : m_settingChanges{} {}
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SettingChanges(const SettingChanges&) = delete;
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SettingChanges(SettingChanges&&) YAML_CPP_NOEXCEPT = default;
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SettingChanges& operator=(const SettingChanges&) = delete;
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SettingChanges& operator=(SettingChanges&& rhs) YAML_CPP_NOEXCEPT {
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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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~SettingChanges() { clear(); }
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void clear() YAML_CPP_NOEXCEPT {
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restore();
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m_settingChanges.clear();
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}
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void restore() YAML_CPP_NOEXCEPT {
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for (const auto& setting : m_settingChanges)
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setting->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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private:
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using setting_changes = std::vector<std::unique_ptr<SettingChangeBase>>;
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setting_changes m_settingChanges;
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};
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} // namespace YAML
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#endif // SETTING_H_62B23520_7C8E_11DE_8A39_0800200C9A66
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