X-Git-Url: https://ginac.de/ginac.git//ginac.git?a=blobdiff_plain;f=ginac%2Fparser%2Fparse_context.cpp;h=2c51ad4bef0e0b25e3fbf686dc8c46dacb0dbcf7;hb=55a08d9cb9005bb10def92d5e8f5a816003da16b;hp=71b1748685c75a66dcee99df4003001c6b13073d;hpb=80b1c3e0ee0e465d56e5c76bef4e52ef2dbc5197;p=ginac.git

diff --git a/ginac/parser/parse_context.cpp b/ginac/parser/parse_context.cpp
index 71b17486..2c51ad4b 100644
--- a/ginac/parser/parse_context.cpp
+++ b/ginac/parser/parse_context.cpp
@@ -1,22 +1,38 @@
+/** @file parse_context.cpp
+ *
+ *  Implementation of the parser context. */
+
+/*
+ *  GiNaC Copyright (C) 1999-2014 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
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
 #include "parse_context.h"
+
 #include <sstream>
 #include <stdexcept>
-namespace GiNaC
-{
 
-symbol
+namespace GiNaC {
+
+ex
 find_or_insert_symbol(const std::string& name, symtab& syms, const bool strict)
 {
 	symtab::const_iterator p = syms.find(name);
-	if (p != syms.end()) {
-		if (is_a<symbol>(p->second))
-			return ex_to<symbol>(p->second);
-		else
-			throw std::invalid_argument(
-				std::string("find_or_insert_symbol: name \"")
-				+ name + "\" does not correspond to a symbol");
-	}
-
+	if (p != syms.end())
+		return p->second;
 
 	if (strict)
 		throw std::invalid_argument(
@@ -28,5 +44,4 @@ find_or_insert_symbol(const std::string& name, symtab& syms, const bool strict)
 	return sy;
 }
 
-}
-
+} // namespace GiNaC