std::atomic<unsigned> _ref_count;
};
+ ///
+ /// Simple reference to a clover::ref_counter object. Unlike
+ /// clover::intrusive_ptr and clover::intrusive_ref, it does nothing
+ /// special when the reference count drops to zero.
+ ///
+ class ref_holder {
+ public:
+ ref_holder(ref_counter &o) : p(&o) {
+ p->retain();
+ }
+
+ ref_holder(const ref_holder &ref) :
+ ref_holder(*ref.p) {
+ }
+
+ ref_holder(ref_holder &&ref) :
+ p(ref.p) {
+ ref.p = NULL;
+ }
+
+ ~ref_holder() {
+ if (p)
+ p->release();
+ }
+
+ ref_holder &
+ operator=(ref_holder ref) {
+ std::swap(ref.p, p);
+ return *this;
+ }
+
+ bool
+ operator==(const ref_holder &ref) const {
+ return p == ref.p;
+ }
+
+ bool
+ operator!=(const ref_holder &ref) const {
+ return p != ref.p;
+ }
+
+ private:
+ ref_counter *p;
+ };
+
///
/// Intrusive smart pointer for objects that implement the
/// clover::ref_counter interface.