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-rw-r--r--external_libs/yaml-cpp/src/setting.h105
1 files changed, 105 insertions, 0 deletions
diff --git a/external_libs/yaml-cpp/src/setting.h b/external_libs/yaml-cpp/src/setting.h
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+++ b/external_libs/yaml-cpp/src/setting.h
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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::auto_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::auto_ptr <SettingChangeBase> Setting<T>::set(const T& value) {
+ std::auto_ptr <SettingChangeBase> pChange(new SettingChange<T> (this));
+ m_value = value;
+ return pChange;
+ }
+
+ class SettingChanges: private noncopyable
+ {
+ public:
+ SettingChanges() {}
+ ~SettingChanges() { clear(); }
+
+ void clear() {
+ restore();
+
+ for(setting_changes::const_iterator it=m_settingChanges.begin();it!=m_settingChanges.end();++it)
+ delete *it;
+ m_settingChanges.clear();
+ }
+
+ void restore() {
+ for(setting_changes::const_iterator it=m_settingChanges.begin();it!=m_settingChanges.end();++it)
+ (*it)->pop();
+ }
+
+ void push(std::auto_ptr <SettingChangeBase> pSettingChange) {
+ m_settingChanges.push_back(pSettingChange.release());
+ }
+
+ // like std::auto_ptr - assignment is transfer of ownership
+ SettingChanges& operator = (SettingChanges& rhs) {
+ if(this == &rhs)
+ return *this;
+
+ clear();
+ m_settingChanges = rhs.m_settingChanges;
+ rhs.m_settingChanges.clear();
+ return *this;
+ }
+
+ private:
+ typedef std::vector <SettingChangeBase *> setting_changes;
+ setting_changes m_settingChanges;
+ };
+}
+
+#endif // SETTING_H_62B23520_7C8E_11DE_8A39_0800200C9A66