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#ifndef _INCLUDED_SEMVAL_
#define _INCLUDED_SEMVAL_
#include "../base/base.h"
class SemVal
{
Base *d_bp;
public:
SemVal(); // Never used by me, but needed to
// enlarge the semantic value stack
SemVal(Base *bp); // Semval will own bp
SemVal(SemVal const &other);
~SemVal();
SemVal &operator=(SemVal const &other);
Base const &base() const;
template <typename Class>
Class const &downcast();
private:
void copy(SemVal const &other);
void destroy();
};
inline Base const &SemVal::base() const
{
return *d_bp;
}
inline SemVal::SemVal()
:
d_bp(0)
{}
inline SemVal::SemVal(Base *bp)
:
d_bp(bp)
{}
inline SemVal::~SemVal()
{
destroy();
}
inline SemVal::SemVal(SemVal const &other)
{
copy(other);
}
inline SemVal &SemVal::operator=(SemVal const &other)
{
if (this != &other)
{
destroy();
copy(other);
}
return *this;
}
inline void SemVal::copy(SemVal const &other)
{
d_bp = other.d_bp ? other.d_bp->clone() : 0;
}
inline void SemVal::destroy()
{
delete d_bp;
}
template <typename Class>
inline Class const &SemVal::downcast()
{
return dynamic_cast<Class &>(*d_bp);
}
inline ostream &operator<<(ostream &out, SemVal const &obj)
{
if (&obj.base())
return out << obj.base();
return out << "<0>";
}
#endif
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