added void callback to feval family

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@3847 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 14 insertions, 0 deletions

diff --git a/gnuradio-core/src/lib/general/gr_feval.cc b/gnuradio-core/src/lib/general/gr_feval.cc
index 532a14018..3617620b5 100644
--- a/gnuradio-core/src/lib/general/gr_feval.cc
+++ b/gnuradio-core/src/lib/general/gr_feval.cc
@@ -50,6 +50,14 @@ gr_feval_ll::eval(long x)
   return 0;
 }
 
+gr_feval::~gr_feval(){}
+
+void
+gr_feval::eval(void)
+{
+  // nop
+}
+
 /*
  * Trivial examples showing C++ (transparently) calling Python
  */
@@ -70,3 +78,9 @@ gr_feval_ll_example(gr_feval_ll *f, long x)
 {
   return f->eval(x);
 }
+
+void
+gr_feval_example(gr_feval *f)
+{
+  f->eval();
+}