From 67d4ed42b1d9a6e1df41aa1c7f26020fc4b6a3ad Mon Sep 17 00:00:00 2001
From: Robert Bradshaw <robertwb@math.washington.edu>
Date: Thu, 14 Jan 2010 15:09:41 -0800
Subject: [PATCH] Dereference node.

---
 Cython/Compiler/ExprNodes.py           | 22 ++++++++++++++++++++--
 Cython/Compiler/ParseTreeTransforms.py |  1 +
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/Cython/Compiler/ExprNodes.py b/Cython/Compiler/ExprNodes.py
index ff8e6525..a9de0cee 100755
--- a/Cython/Compiler/ExprNodes.py
+++ b/Cython/Compiler/ExprNodes.py
@@ -4129,7 +4129,9 @@ class UnopNode(ExprNode):
             self.gil_error()
 
     def is_cpp_operation(self):
-        return self.operand.type.is_cpp_class
+        type = self.operand.type
+        return (type.is_cpp_class or 
+            (type.is_ptr or type.is_reference) and type.base_type.is_cpp_class)
     
     def coerce_operand_to_pyobject(self, env):
         self.operand = self.operand.coerce_to_pyobject(env)
@@ -4156,7 +4158,7 @@ class UnopNode(ExprNode):
 
     def analyse_cpp_operation(self, env):
         type = operand.type
-        if type.is_ptr:
+        if type.is_ptr or type.is_reference:
             type = type.base_type
         entry = env.lookup(type.name)
         function = entry.type.scope.lookup("operator%s" % self.operator)
@@ -4259,6 +4261,22 @@ class TildeNode(UnopNode):
         return "(~%s)" % self.operand.result()
 
 
+class DereferenceNode(UnopNode):
+    #  unary '*' operator
+    
+    def is_py_operation(self):
+        return False
+
+    def analyse_c_operation(self, env):
+        if self.operand.type.is_ptr:
+            self.type = self.operand.type.base_type
+        else:
+            self.type_error()
+
+    def calculate_result_code(self):
+        return "(*%s)" % self.operand.result()
+
+
 class AmpersandNode(ExprNode):
     #  The C address-of operator.
     #
diff --git a/Cython/Compiler/ParseTreeTransforms.py b/Cython/Compiler/ParseTreeTransforms.py
index a0f05484..87963075 100644
--- a/Cython/Compiler/ParseTreeTransforms.py
+++ b/Cython/Compiler/ParseTreeTransforms.py
@@ -326,6 +326,7 @@ class InterpretCompilerDirectives(CythonTransform, SkipDeclarations):
     unop_method_nodes = {
         'typeof': TypeofNode,
         'address': AmpersandNode,
+        'dereference': DereferenceNode,
     }
     
     special_methods = set(['declare', 'union', 'struct', 'typedef', 'sizeof', 'cast', 'pointer', 'compiled', 'NULL']
-- 
2.26.2