X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?a=blobdiff_plain;f=ginac%2Fparser%2Fparse_context.h;h=fe844127a35621f8030d0f7d1cab392285c350d1;hb=0b985d5336debdd396f0fbeca8df850af5f569f4;hp=3516320981c1b82191c404361d6086e4a6cd96f6;hpb=3aec0ba298693329c1194e547043fef1a78b1b0d;p=ginac.git

diff --git a/ginac/parser/parse_context.h b/ginac/parser/parse_context.h
index 35163209..fe844127 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) 1999-2015 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
@@ -82,15 +82,39 @@ typedef ex (*reader_func)(const exvector& args);
  *    number of arguments.
  * 3. User can extend the parser via custom prototype tables. It's possible
  *    to read user defined classes, create abbreviations, etc.
+ *
+ * NOTE: due to a hack that allows user defined functions to be parsed, the map
+ *       value of type reader_func is internally treated as an unsigned and not as a
+ *       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.
  *
- * It supports most of builtin GiNaC functions.
+ * It supports all defined GiNaC functions and "pow", "sqrt", and "power".
  */
 extern const prototype_table& get_default_reader();
+/**
+ * Builtin prototype table.
+ *
+ * It supports only the builtin GiNaC functions and "pow", "sqrt", and "power".
+ */
+extern const prototype_table& get_builtin_reader();
 
 } // namespace GiNaC