Output: Print canonical form of types named in default arguments

In code like

    namespace ns {
      typedef unsigned int UI;
      void f(UI = (UI)0);
    }

we previously generated `default="(UI)0"` for the default argument of
`f` because Clang prints the expression as it was written in the source.
GCC-XML would generate the canonical typed value `default="0u"`.
Ideally we should generate `default="(ns::UI)0"` but Clang does not
offer hooks into its type printing API.  Instead we can produce a value
which is useful to tools reading the output by printing the cast with a
canonical type like `default="(unsigned int)0"`.  In the case that the
type names a struct or class the canonical type will be printed as the
fully qualified name.

GitHub-Issue: CastXML/CastXML#51

2 files changed, 21 insertions, 0 deletions

diff --git a/test/input/Function-Argument-default-cast.cxx b/test/input/Function-Argument-default-cast.cxx
new file mode 100644
index 0000000..09ff46b
--- /dev/null
+++ b/test/input/Function-Argument-default-cast.cxx
@@ -0,0 +1,13 @@
+namespace start {
+  struct Base { Base(); virtual ~Base(); };
+  struct Derived: public Base {};
+  Base* b();
+  Base const* bc();
+  typedef int Int;
+  void f(Int = (Int)0,
+         Base* = (Base*)0,
+         Base* = static_cast<Base*>(0),
+         Base* = reinterpret_cast<Base*>(0),
+         Base* = const_cast<Base*>(bc()),
+         Derived* = dynamic_cast<Derived*>(b()));
+}
diff --git a/test/input/Method-Argument-default-cast.cxx b/test/input/Method-Argument-default-cast.cxx
new file mode 100644
index 0000000..903b622
--- /dev/null
+++ b/test/input/Method-Argument-default-cast.cxx
@@ -0,0 +1,8 @@
+class start {
+  class Class;
+  typedef int Int;
+  int f(Int = (Int)0,
+        Class* = (Class*)0,
+        Class* = static_cast<Class*>(0),
+        Class* = reinterpret_cast<Class*>(0));
+};