add is_pure method to Expression class

2007-11-29  Juerg Billeter  <j@bitron.ch>

	* vala/valaaddressofexpression.vala,
	  vala/valaarraycreationexpression.vala, vala/valaassignment.vala,
	  vala/valabaseaccess.vala, vala/valabinaryexpression.vala,
	  vala/valacastexpression.vala, vala/valaconditionalexpression.vala,
	  vala/valaelementaccess.vala, vala/valaexpression.vala,
	  vala/valainitializerlist.vala, vala/valainvocationexpression.vala,
	  vala/valalambdaexpression.vala, vala/valaliteralexpression.vala,
	  vala/valamemberaccess.vala, vala/valaobjectcreationexpression.vala,
	  vala/valaparenthesizedexpression.vala,
	  vala/valapointerindirection.vala, vala/valapostfixexpression.vala,
	  vala/valareferencetransferexpression.vala,
	  vala/valasizeofexpression.vala, vala/valatypecheck.vala,
	  vala/valatypeofexpression.vala, vala/valaunaryexpression.vala: add
	  is_pure method to Expression class

svn path=/trunk/; revision=739

1 files changed, 6 insertions, 0 deletions

diff --git a/vala/valaexpression.vala b/vala/valaexpression.vala
index dfb7b88c9..f9ddb173d 100644
--- a/vala/valaexpression.vala
+++ b/vala/valaexpression.vala
@@ -79,4 +79,10 @@ public abstract class Vala.Expression : CodeNode {
 	 * The code generator sets and uses them for memory management.
 	 */
 	public ArrayList<VariableDeclarator> temp_vars = new ArrayList<VariableDeclarator> ();
+
+	/**
+	 * Returns whether this expression is pure, i.e. whether this expression
+	 * is free of side-effects.
+	 */
+	public abstract bool is_pure ();
 }