Minor code cleanup, refactored list functions and cleaned up function names, moved support for elements to a new header file.

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@826543 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 8 insertions, 0 deletions

diff --git a/cpp/sca/kernel/function.hpp b/cpp/sca/kernel/function.hpp
index c22a93c715..55637f68bf 100644
--- a/cpp/sca/kernel/function.hpp
+++ b/cpp/sca/kernel/function.hpp
@@ -163,6 +163,7 @@ public:
     }
 
     template<typename S> friend std::ostream& operator<<(std::ostream&, const lambda<S>&);
+    template<typename S> friend const bool isNil(const lambda<S>& l);
 
 private:
     typedef Callable<R,P...> CallableType;
@@ -174,6 +175,13 @@ template<typename S> std::ostream& operator<<(std::ostream& out, const lambda<S>
 }
 
 /**
+ * Return true if a lambda is nil.
+ */
+template<typename S> const bool isNil(const lambda<S>& l) {
+    return ((void*)l.callable) == 0;
+}
+
+/**
  * Curry a lambda function.
  */
 template<typename R, typename T, typename... P> class curried {