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// Copyright (c) 1994 James Clark
// See the file COPYING for copying permission.
#ifndef Owner_INCLUDED
#define Owner_INCLUDED 1
// A pointer that owns the object pointed to.
// T must be of class type.
// This is coded so that T need not yet have been defined.
#ifdef SP_NAMESPACE
namespace SP_NAMESPACE {
#endif
template<class T>
class Owner {
public:
Owner() : p_(0) { }
Owner(T *p) : p_(p) { }
~Owner();
void operator=(T *p) {
if (p_) del();
p_ = p;
}
operator int() const { return p_ != 0; }
T *pointer() const { return p_; }
T *operator->() const { return p_; }
T &operator*() const { return *p_; }
void swap(Owner<T> &x) {
T *tem = p_;
p_ = x.p_;
x.p_ = tem;
}
T *extract() {
T *tem = p_;
p_ = 0;
return tem;
}
void clear() {
if (p_) {
del();
p_ = 0;
}
}
private:
Owner(const Owner<T> &); // undefined
void operator=(const Owner<T> &o); // undefined
void del();
T *p_;
};
#ifdef SP_NAMESPACE
}
#endif
#endif /* not Owner_INCLUDED */
#ifdef SP_DEFINE_TEMPLATES
#include "Owner.cxx"
#endif
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