mirror of https://github.com/Icinga/icinga2.git
138 lines
3.4 KiB
C++
138 lines
3.4 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012 Icinga Development Team (http://www.icinga.org/) *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License *
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* as published by the Free Software Foundation; either version 2 *
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* of the License, or (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software Foundation *
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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******************************************************************************/
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#ifndef VARIANT_H
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#define VARIANT_H
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namespace icinga
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{
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/**
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* A type that can hold an arbitrary value.
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*
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* @ingroup base
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*/
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class I2_BASE_API Variant
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{
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public:
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inline Variant(void)
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: m_Value()
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{ }
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inline Variant(int value)
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: m_Value(static_cast<long>(value))
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{ }
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inline Variant(long value)
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: m_Value(value)
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{ }
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inline Variant(double value)
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: m_Value(value)
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{ }
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inline Variant(bool value)
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: m_Value(static_cast<long>(value))
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{ }
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inline Variant(const string& value)
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: m_Value(value)
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{ }
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inline Variant(const char *value)
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: m_Value(string(value))
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{ }
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template<typename T>
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inline Variant(const shared_ptr<T>& value)
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{
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Object::Ptr object = dynamic_pointer_cast<Object>(value);
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if (!object)
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throw invalid_argument("shared_ptr value type must inherit from Object class.");
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m_Value = object;
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}
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operator long(void) const
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{
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if (m_Value.type() != typeid(long)) {
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return boost::lexical_cast<long>(m_Value);
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} else {
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return boost::get<long>(m_Value);
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}
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}
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operator double(void) const
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{
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if (m_Value.type() != typeid(double)) {
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return boost::lexical_cast<double>(m_Value);
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} else {
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return boost::get<double>(m_Value);
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}
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}
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operator bool(void) const
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{
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return (static_cast<long>(*this) != 0);
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}
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operator string(void) const
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{
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if (m_Value.type() != typeid(string)) {
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string result = boost::lexical_cast<string>(m_Value);
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m_Value = result;
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return result;
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} else {
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return boost::get<string>(m_Value);
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}
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}
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template<typename T>
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operator shared_ptr<T>(void) const
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{
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shared_ptr<T> object = dynamic_pointer_cast<T>(boost::get<Object::Ptr>(m_Value));
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if (!object)
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throw bad_cast();
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return object;
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}
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bool IsEmpty(void) const;
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bool IsScalar(void) const;
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bool IsObject(void) const;
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template<typename T>
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bool IsObjectType(void) const
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{
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if (!IsObject())
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return false;
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return (dynamic_pointer_cast<T>(boost::get<Object::Ptr>(m_Value)));
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}
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private:
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mutable boost::variant<boost::blank, long, double, string, Object::Ptr> m_Value;
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};
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}
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#endif /* VARIANT_H */
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