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.. index:: Use-Nullptr Transform
=====================
Use-Nullptr Transform
=====================
The Use-Nullptr Transform is a transformation to convert the usage of null
pointer constants (eg. ``NULL``, ``0``) to use the new C++11 ``nullptr``
keyword. The transform is enabled with the :option:`-use-nullptr` option of
:program:`clang-modernize`.
Example
=======
.. code-block:: c++
void assignment() {
char *a = NULL;
char *b = 0;
char c = 0;
}
int *ret_ptr() {
return 0;
}
transforms to:
.. code-block:: c++
void assignment() {
char *a = nullptr;
char *b = nullptr;
char c = 0;
}
int *ret_ptr() {
return nullptr;
}
User defined macros
===================
By default this transform will only replace the ``NULL`` macro and will skip any
user-defined macros that behaves like ``NULL``. The user can use the
:option:`-user-null-macros` option to specify a comma-separated list of macro
names that will be transformed along with ``NULL``.
Example
-------
.. code-block:: c++
#define MY_NULL (void*)0
void assignment() {
void *p = MY_NULL;
}
using the command-line
.. code-block:: bash
clang-modernize -use-nullptr -user-null-macros=MY_NULL foo.cpp
transforms to:
.. code-block:: c++
#define MY_NULL NULL
void assignment() {
int *p = nullptr;
}
Risk
====
:option:`-risk` has no effect in this transform.
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