add MonitorElement::Ref::attach()

2017-07-07 18:44:24 +02:00
parent 006224b4d1
commit 9244d78a5b
1 changed files with 9 additions and 1 deletions
@@ -154,13 +154,21 @@ public:
    Ref(Monitor& M) :mon(&M), elem(mon->poll()) {}
    Ref(const Monitor::shared_pointer& M) :mon(M.get()), elem(mon->poll()) {}
    ~Ref() { reset(); }
+    void attach(Monitor& M) {
+        reset();
+        mon = &M;
+    }
+    void attach(const Monitor::shared_pointer& M) {
+        reset();
+        mon = M.get();
+    }
    bool next() {
        if(elem) mon->release(elem);
        elem = mon->poll();
        return !!elem;
    }
    void reset() {
-        if(elem) mon->release(elem);
+        if(elem && mon) mon->release(elem);
        elem.reset();
    }
    Ref& operator++() {// prefix increment.  aka "++(*this)"