[vala] Support casting nullable structs to non-nullable structs

[Jürg Billeter <juergbi src gnome org>]

commit a0eb82a01828f8b6bd867886d734ad7eeeed2a72
Author: Luca Bruno <lethalman88 gmail com>
Date:   Sun Jan 17 23:07:49 2010 +0100

    Support casting nullable structs to non-nullable structs
    
    Fixes bug 588832.

 codegen/valaccodebasemodule.vala |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index 06f1dda..32f1b4a 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -4225,7 +4225,13 @@ internal class Vala.CCodeBaseModule : CCodeModule {
 				}
 			}
 
-			expr.ccodenode = new CCodeCastExpression ((CCodeExpression) expr.inner.ccodenode, expr.type_reference.get_cname ());
+			var innercexpr = (CCodeExpression) expr.inner.ccodenode;
+			if (expr.type_reference.data_type is Struct && !expr.type_reference.nullable &&
+				expr.inner.value_type.data_type is Struct && expr.inner.value_type.nullable) {
+				// nullable integer or float or boolean or struct cast to non-nullable
+				innercexpr = new CCodeUnaryExpression (CCodeUnaryOperator.POINTER_INDIRECTION, innercexpr);
+			}
+			expr.ccodenode = new CCodeCastExpression (innercexpr, expr.type_reference.get_cname ());
 		}
 	}