From 4c6e977ff2afba3d15de17c7846f3644ed49c95a Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Sat, 21 Jan 2012 15:26:43 -0500
Subject: [PATCH] Don't generate x**z in C when x*(*z) is meant--i.e. add
 spaces.

---
 pymbolic/mapper/c_code.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pymbolic/mapper/c_code.py b/pymbolic/mapper/c_code.py
index bae2d10..0c06625 100644
--- a/pymbolic/mapper/c_code.py
+++ b/pymbolic/mapper/c_code.py
@@ -27,6 +27,15 @@ class CCodeMapper(SimplifyingSortingStringifyMapper):
         return self.copy(self.cse_name_list + cses_and_values)
 
     # mappings ----------------------------------------------------------------
+    def map_product(self, expr, enclosing_prec):
+        from pymbolic.mapper.stringifier import PREC_PRODUCT
+        return self.parenthesize_if_needed(
+                # Spaces prevent '**z' (times dereference z), which
+                # is hard to read.
+
+                self.join_rec(" * ", expr.children, PREC_PRODUCT),
+                enclosing_prec, PREC_PRODUCT)
+
     def map_constant(self, x, enclosing_prec):
         if isinstance(x, complex):
             return "std::complex<%s>(%s, %s)" % (
-- 
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