Fix some pedantic compiler warnings.

[ginac.git] / ginac / basic.h

diff --git a/ginac/basic.h b/ginac/basic.h
index d014c402db1b459e2f5357d730d755e85cb158b0..0295d015920e1807464d51c5df309e25abd82a7d 100644 (file)
--- a/ginac/basic.h
+++ b/ginac/basic.h
@@ -3,7 +3,7 @@
  *  Interface to GiNaC's ABC. */
 
 /*
- *  GiNaC Copyright (C) 1999-2014 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
@@ -39,7 +39,7 @@
 namespace GiNaC {
 
 class ex;
-class ex_is_less;
+struct ex_is_less;
 class symbol;
 class numeric;
 class relational;
@@ -310,7 +310,7 @@ extern int max_recursion_level;
 template <class T>
 inline bool is_a(const basic &obj)
 {
-       return dynamic_cast<const T *>(&obj) != 0;
+       return dynamic_cast<const T *>(&obj) != nullptr;
 }
 
 /** Check if obj is a T, not including base classes. */