[BUGFIX] Fix crash in parser.

[ginac.git] / ginac / parser / parse_context.h

diff --git a/ginac/parser/parse_context.h b/ginac/parser/parse_context.h
index e82f8aef2c8ac0eb1ccda16be6ae3854448f0413..015ca13517dbce52410fa67a8317030e5a3ce30f 100644 (file)
--- a/ginac/parser/parse_context.h
+++ b/ginac/parser/parse_context.h
@@ -3,7 +3,7 @@
  *  Interface to parser context. */
 
 /*
- *  GiNaC Copyright (C) 1999-2016 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2024 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
@@ -63,7 +63,21 @@ typedef std::pair<std::string, std::size_t> prototype;
  * The parser uses (an associative array of) such functions to construct
  * (GiNaC) classes and functions from a sequence of characters.
  */
-typedef ex (*reader_func)(const exvector& args);
+class reader_func {
+       enum { FUNCTION_PTR, GINAC_FUNCTION };
+public:
+       reader_func(ex (*func_)(const exvector& args))
+               : type(FUNCTION_PTR), serial(0), func(func_) {}
+       reader_func(unsigned serial_)
+               : type(GINAC_FUNCTION), serial(serial_), func(nullptr) {}
+       ex operator()(const exvector& args) const;
+private:
+       unsigned type;
+       unsigned serial;
+       ex (*func)(const exvector& args);
+};
+
+
 
 /**
  * Prototype table.