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@pallas /countable.hh
Last active Aug 29, 2015

C++ reference counter base, with hook
// All rights reserved,
// Derrick Pallas
// License: zlib
#ifndef COUNTABLE_H
#define COUNTABLE_H
#include <cassert>
template <class T>
class countable {
public:
countable() : r(0) { }
~countable() { assert(!r); }
unsigned refs() { return r; }
bool collect() { return true; }
static T* get(T * t) {
++t->r;
return t;
}
static bool put(T * t) {
assert(t->refs());
if (--t->r)
return false;
if (t->collect())
delete t;
return true;
}
private:
countable(const countable &);
countable & operator=(const countable &);
unsigned r;
};
namespace ref {
template <class T> T* get(T * t) { return countable<T>::get(t); }
template <class T> bool put(T * t) { return countable<T>::put(t); }
}
#endif//COUNTABLE_H
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