noncopyable_function add bool operator

std::functions can be check it it was set or not, noncopyable_function should behave the same, so if f is a noncopyable_function if (f) should be true if f was set, or false if not. This patch adds a bool operator to noncopyable_function Signed-off-by: Amnon Heiman <[email protected]> Message-Id: <[email protected]>
masatake · Oct 9, 2017 · 348fc38 · 348fc38
1 parent daa44a8
commit 348fc38
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/util/noncopyable_function.hh b/util/noncopyable_function.hh
@@ -145,6 +145,10 @@ public:
     Ret operator()(Args... args) const {
         return _vtable->call(this, std::forward<Args>(args)...);
     }
+
+    explicit operator bool() const {
+        return _vtable != &_s_empty_vtable;
+    }
 };