July 01, 2005
Unsmart Pointers, Part I
Listing 5
#include <cassert>
const bool deletable = true;
template<typename T>
class new_ptr {
public:
new_ptr(T* x) : m(x) { };
T* m;
};
template<typename T>
inline new_ptr<T> new_cast(T* x) {
return new_ptr<T>(x);
}
template<typename T, bool can_delete = false>
class ptr {
public:
ptr() : m(NULL) { };
ptr(const ptr& x) : m(x.m) { };
ptr(T* x) : m(x) { };
ptr(const ptr<T, deletable>& x) : m(x.raw_pointer()) { };
T* operator->() const { return m; }
private:
T* m;
};
template<typename T>
class ptr<T, deleteable> {
public:
ptr() : m(NULL) { };
ptr(const ptr& x) : m(x.m) { };
ptr(const new_ptr<T>& x) : m(x.m) { };
void Delete() { assert(m != NULL); delete m; assert((m = NULL) == NULL); }
T* operator->() const { return m; }
T* raw_pointer() const { return m; }
private:
T* m;
};
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