122 lines
2.7 KiB
C++
122 lines
2.7 KiB
C++
#ifndef __boxed_value_hpp__
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#define __boxed_value_hpp__
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#include "type_info.hpp"
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#include <boost/shared_ptr.hpp>
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#include <boost/any.hpp>
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#include <boost/ref.hpp>
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class Boxed_Value
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{
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public:
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template<typename T>
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explicit Boxed_Value(boost::shared_ptr<T> obj)
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: m_type_info(Get_Type_Info<T>()()), m_obj(obj), m_is_ref(false)
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{
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}
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template<typename T>
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explicit Boxed_Value(boost::reference_wrapper<T> obj)
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: m_type_info(Get_Type_Info<T>()()), m_obj(obj), m_is_ref(true)
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{
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}
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template<typename T>
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explicit Boxed_Value(const T& t)
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: m_type_info(Get_Type_Info<T>()()), m_obj(boost::shared_ptr<T>(new T(t))), m_is_ref(false)
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{
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}
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Boxed_Value(const Boxed_Value &t_so)
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: m_type_info(t_so.m_type_info), m_obj(t_so.m_obj), m_is_ref(t_so.m_is_ref)
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{
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}
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Boxed_Value()
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: m_type_info(Get_Type_Info<void>()()), m_is_ref(false)
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{
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}
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const Type_Info &get_type_info()
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{
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return m_type_info;
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}
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boost::any get() const
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{
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return m_obj;
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}
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bool is_ref() const
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{
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return m_is_ref;
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}
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private:
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Type_Info m_type_info;
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boost::any m_obj;
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bool m_is_ref;
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};
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//cast_help specializations
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template<typename Result>
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struct Cast_Helper
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{
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typename boost::reference_wrapper<typename boost::add_const<Result>::type > operator()(Boxed_Value ob)
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{
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if (ob.is_ref())
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{
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return boost::cref((boost::any_cast<boost::reference_wrapper<Result> >(ob.get())).get());
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} else {
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return boost::cref(*(boost::any_cast<boost::shared_ptr<Result> >(ob.get())));
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}
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}
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};
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template<typename Result>
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struct Cast_Helper<const Result &>
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{
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typename boost::reference_wrapper<typename boost::add_const<Result>::type > operator()(Boxed_Value ob)
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{
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if (ob.is_ref())
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{
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return boost::cref((boost::any_cast<boost::reference_wrapper<Result> >(ob.get())).get());
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} else {
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return boost::cref(*(boost::any_cast<boost::shared_ptr<Result> >(ob.get())));
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}
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}
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};
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template<typename Result>
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struct Cast_Helper<Result *>
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{
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Result *operator()(Boxed_Value ob)
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{
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if (ob.is_ref())
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{
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return (boost::any_cast<boost::reference_wrapper<Result> >(ob.get())).get_pointer();
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} else {
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return (boost::any_cast<boost::shared_ptr<Result> >(ob.get())).get();
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}
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}
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};
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template<typename Result>
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struct Cast_Helper<Result &>
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{
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typename boost::reference_wrapper<Result> operator()(Boxed_Value ob)
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{
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if (ob.is_ref())
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{
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return boost::any_cast<boost::reference_wrapper<Result> >(ob.get());
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} else {
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return boost::ref(*(boost::any_cast<boost::shared_ptr<Result> >(ob.get())));
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}
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}
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};
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#endif
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