Merge branch 'embb452_dataflow_stream_operators' into development

dataflow_cpp/include/embb/dataflow/internal/process.h

@@ -102,8 +102,9 @@ class Process< Slices, Serial, Inputs<Slices, I1, I2, I3, I4, I5>,
   }
 
   template <typename T>
-  void operator >> (T & target) {
+  T & operator >> (T & target) {
     GetOutput<0>() >> target.template GetInput<0>();
+    return target;
   }
 
   virtual void OnClock(int clock) {

dataflow_cpp/include/embb/dataflow/internal/select.h

@@ -105,8 +105,9 @@ class Select
   }
 
   template <typename T>
-  void operator >> (T & target) {
+  T & operator >> (T & target) {
     GetOutput<0>() >> target.template GetInput<0>();
+    return target;
   }
 
   virtual void OnClock(int clock) {

dataflow_cpp/include/embb/dataflow/internal/source.h

@@ -83,8 +83,9 @@ class Source< Slices, Outputs<Slices, O1, O2, O3, O4, O5> >
   }
 
   template <typename T>
-  void operator >> (T & target) {
+  T & operator >> (T & target) {
     GetOutput<0>() >> target.template GetInput<0>();
+    return target;
   }
 
  private:

dataflow_cpp/include/embb/dataflow/internal/switch.h

@@ -103,8 +103,9 @@ class Switch
   }
 
   template <typename T>
-  void operator >> (T & target) {
+  T & operator >> (T & target) {
     GetOutput<0>() >> target.template GetInput<0>();
+    return target;
   }
 
   virtual void OnClock(int clock) {

dataflow_cpp/test/dataflow_cpp_test_simple.cc

@@ -188,11 +188,14 @@ void SimpleTest::TestBasic() {
 
     source.GetOutput<0>() >> sw.GetInput<1>();
 
-    source.GetOutput<0>() >> pred.GetInput<0>();
-    pred.GetOutput<0>() >> sw.GetInput<0>();
+    // connection chain representing the commented single connections below
+    source >> pred >> sw >> filter;
+
+    //source.GetOutput<0>() >> pred.GetInput<0>();
+    //pred.GetOutput<0>() >> sw.GetInput<0>();
     pred.GetOutput<0>() >> sel.GetInput<0>();
 
-    sw.GetOutput<0>() >> filter.GetInput<0>();
+    //sw.GetOutput<0>() >> filter.GetInput<0>();
     filter.GetOutput<0>() >> sel.GetInput<1>();
 
     constant.GetOutput<0>() >> mult.GetInput<0>();

doc/examples/dataflow/dataflow_connect-snippet.h

-  read >> replace;
-  replace >> write;
+  read >> replace >> write;