X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fparser%2Fparse_context.h;h=60151fd37988af0538f6b000bd50285930ee8d7d;hp=1145a871cb4b2da67a95373d44ea0812ab2567a5;hb=9a4f392521083d28e1c238e7898ab1d2ac5b73cd;hpb=5375260fd145e474246b7a3cce0fc2e667bd4ec8

diff --git a/ginac/parser/parse_context.h b/ginac/parser/parse_context.h
index 1145a871..60151fd3 100644
--- a/ginac/parser/parse_context.h
+++ b/ginac/parser/parse_context.h
@@ -3,7 +3,7 @@
  *  Interface to parser context. */
 
 /*
- *  GiNaC Copyright (C) 1999-2010 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2011 Johannes Gutenberg University Mainz, Germany
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -88,7 +88,20 @@ typedef ex (*reader_func)(const exvector& args);
  *       function pointer!! The unsigned has to correspond to the serial number of
  *       the defined GiNaC function.
  */
-typedef std::map<prototype, reader_func> prototype_table;
+class PrototypeLess
+{
+public:
+	bool operator()(const prototype& p1, const prototype& p2) const
+	{
+		int s = p1.first.compare(p2.first);
+		if (s == 0) {
+			if ((p1.second == 0) || (p2.second == 0)) return false;
+			return p1.second < p2.second;
+		}
+		return s < 0;
+	}
+};
+typedef std::map<prototype, reader_func, PrototypeLess> prototype_table;
 
 /**
  * Default prototype table.