utils/function: expose also ref and cref

ref and cref are also in tr1, and in functional, and are useful when
when using functors allocated on the stack that should not be copied.

Change-Id: I7e14560d88eaa9306e47c4bd71d011f406d1054a
Reviewed-by: hjk <hjk121@nokiamail.com>

src/libs/utils/function.cpp

@@ -41,7 +41,7 @@ void functionUser(Utils::function<int()> generator, Utils::function<void(int)> c
 
 struct GenFunctor
 {
-    int operator()() { return 29; }
+    int operator()() const { return 29; }
 };
 
 struct ConsumerFunctor
@@ -49,6 +49,13 @@ struct ConsumerFunctor
     void operator()(int) {}
 };
 
+struct ConsumerFunctor2
+{
+    ConsumerFunctor2() : i(0) { }
+    int i;
+    void operator()(int j) { i = j; }
+};
+
 int generatorF()
 {
     return 42;
@@ -64,6 +71,9 @@ void test()
 {
     functionUser(GenFunctor(), ConsumerFunctor());
     functionUser(&generatorF, &consumerF);
+    ConsumerFunctor2 f2;
+    GenFunctor g2;
+    functionUser(Utils::cref(g2), Utils::ref(f2));
 }
 
 } // end namespace

src/libs/utils/function.h

@@ -39,9 +39,9 @@
 #  ifdef __GNUC__
 #    include <tr1/functional>
 #  endif
-namespace Utils { using std::tr1::function; }
+namespace Utils { using std::tr1::function; using std::tr1::ref; using std::tr1::cref; }
 #else
-namespace Utils { using std::function; }
+namespace Utils { using std::function; using std::ref; using std::cref; }
 #endif
 
 #endif // QTC_FUNCTION_H