X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fex.h;h=6c9d429c7a6403e0b620a73c7ea31da0b5a9c433;hp=dccf37af2edeb93eefffb2d6a1f1e61145d70880;hb=7805dc0c2358b7774ad08cd443cd945cbd940749;hpb=be11202909f8014b213065ca85272af403a530f1

diff --git a/ginac/ex.h b/ginac/ex.h
index dccf37af..6c9d429c 100644
--- a/ginac/ex.h
+++ b/ginac/ex.h
@@ -134,8 +134,8 @@ public:
 	// operand access
 	size_t nops() const { return bp->nops(); }
 	ex op(size_t i) const { return bp->op(i); }
-	ex operator[](const ex & index) const { return (*bp)[index]; }
-	ex operator[](size_t i) const { return (*bp)[i]; }
+	ex operator[](const ex & index) const { return (const_cast<const basic&>(*bp))[index]; }
+	ex operator[](size_t i) const { return (const_cast<const basic&>(*bp))[i]; }
 	ex & let_op(size_t i);
 	ex & operator[](const ex & index);
 	ex & operator[](size_t i);