October 01, 2001
The Standard Librarian: I/O and Function Objects: Containers of Pointers
October 2001 C++ Experts Forum/The Standard Librarian/Listing 1
#include <vector>
class arena {
private:
struct holder {
virtual ~holder() { }
};
template <class T>
struct obj_holder : public holder {
T obj;
template <class Arg1>
obj_holder(Arg1 arg1)
: obj(arg1) { }
};
std::vector<holder*> owned;
private:
arena(const arena&);
void operator=(const arena&);
public:
arena() { }
~arena() {
destroy_all();
}
template <class T, class Arg1>
T* create(Arg1 arg1) {
obj_holder<T>* p = new obj_holder<T>(arg1);
owned.push_back(p);
return &p->obj;
}
void destroy_all() {
std::vector<holder*>::size_type i = 0;
while (i < owned.size()) {
delete owned[i];
++i;
}
owned.clear();
}
};
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