C++ (Cpp) Datum::SetFromString示例

	void ActionListSwitch::GenerateCaseMap()
	{
		Datum& cases = Actions();
		Datum::DatumType switchType = Datum::DatumType::UNKNOWN;
		if (cases.Size() > 0)
		{
			delete mCaseMap;
			mCaseMap = new Hashmap<Datum, ActionListSwitchCase*>(cases.Size());
			Datum* conditionDatum = Search((*this)[ATTRIBUTE_SWITCH_VALUE].Get<std::string>());
			if (conditionDatum == nullptr)
			{
				std::stringstream str;
				str << "Undefined variable: " << (*this)[ATTRIBUTE_SWITCH_VALUE].Get<std::string>();
				throw std::exception(str.str().c_str());
			}
			switchType = conditionDatum->Type();
		}
		for (uint32_t i = 0; i < cases.Size(); i++)
		{
			ActionListSwitchCase* switchCase = cases.Get<Scope>(i).As<ActionListSwitchCase>();
			if (switchCase == nullptr)
				continue;
			if (switchCase->DefaultCase)
			{
				Adopt(ActionListSwitchCase::ATTRIBUTE_DEFAULT, *switchCase);
			}
			else
			{
				Datum d;
				d.SetType(switchType);
				d.SetFromString(switchCase->operator[](ActionListSwitchCase::ATTRIBUTE_CASE_VALUE).Get<std::string>());
				mCaseMap->Insert(d, switchCase);
			}
		}
	}