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dynamic_cast.h
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66 lines (62 loc) · 1.44 KB
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#pragma once
#include <iostream>
namespace theExpressionEngine
{
template<typename>
struct dummy
{
};
template<typename T>
struct dynamic_cast_interface
{ virtual ~dynamic_cast_interface(void) = default;
virtual const T*getPtr(const dummy<T>&) const
{ return nullptr;
}
virtual T*getPtr(const dummy<T>&)
{ return nullptr;
}
virtual const T&getReference(const dummy<T>&) const
{ throw std::bad_cast();
}
virtual T&getReference(const dummy<T>&)
{ throw std::bad_cast();
}
};
template<typename T>
inline T *dynCast(dynamic_cast_interface<T> *const _p)
{ return _p->getPtr(dummy<T>());
}
template<typename T>
inline const T *dynCast(const dynamic_cast_interface<T> *const _p)
{ return _p->getPtr(dummy<T>());
}
template<typename T>
inline T &dynCast(dynamic_cast_interface<T> &_r)
{ return _r.getReference(dummy<T>());
}
template<typename T>
inline const T &dynCast(const dynamic_cast_interface<T> &_r)
{ return _r.getReference(dummy<T>());
}
template<typename T>
struct dynamic_cast_implementation:T
{ virtual ~dynamic_cast_implementation(void) = default;
template<typename ...ARGS>
dynamic_cast_implementation(ARGS&&..._r)
:T(std::forward<ARGS>(_r)...)
{
}
virtual const T*getPtr(const dummy<T>&) const override
{ return this;
}
virtual T*getPtr(const dummy<T>&) override
{ return this;
}
virtual const T&getReference(const dummy<T>&) const override
{ return *this;
}
virtual T&getReference(const dummy<T>&) override
{ return *this;
}
};
}