Replace use of NULL by C++11 nullptr.

[ginac.git] / ginac / basic.cpp

diff --git a/ginac/basic.cpp b/ginac/basic.cpp
index f9f18f5ca13b8f6e0a82ba54b2a5a1ae4cba7991..563dd7d5b6455fe9453885111bb0aac7a4259ed9 100644 (file)
--- a/ginac/basic.cpp
+++ b/ginac/basic.cpp
@@ -3,7 +3,7 @@
  *  Implementation of GiNaC's ABC. */
 
 /*
- *  GiNaC Copyright (C) 1999-2009 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
@@ -240,7 +240,7 @@ ex basic::op(size_t i) const
        throw(std::range_error(std::string("basic::op(): ") + class_name() + std::string(" has no operands")));
 }
 
-/** Return modifyable operand/member at position i. */
+/** Return modifiable operand/member at position i. */
 ex & basic::let_op(size_t i)
 {
        ensure_if_modifiable();
@@ -297,12 +297,12 @@ ex basic::map(map_function & f) const
        if (num == 0)
                return *this;
 
-       basic *copy = NULL;
+       basic *copy = nullptr;
        for (size_t i=0; i<num; i++) {
                const ex & o = op(i);
                const ex & n = f(o);
                if (!are_ex_trivially_equal(o, n)) {
-                       if (copy == NULL)
+                       if (copy == nullptr)
                                copy = duplicate();
                        copy->let_op(i) = n;
                }