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.. title:: clang-tidy - readability-redundant-preprocessor
readability-redundant-preprocessor
==================================
Finds potentially redundant preprocessor directives. At the moment the
following cases are detected:
* `#ifdef` .. `#endif` pairs which are nested inside an outer pair with the
same condition. For example:
.. code-block:: c++
#ifdef FOO
#ifdef FOO // inner ifdef is considered redundant
void f();
#endif
#endif
* Same for `#ifndef` .. `#endif` pairs. For example:
.. code-block:: c++
#ifndef FOO
#ifndef FOO // inner ifndef is considered redundant
void f();
#endif
#endif
* `#ifndef` inside an `#ifdef` with the same condition:
.. code-block:: c++
#ifdef FOO
#ifndef FOO // inner ifndef is considered redundant
void f();
#endif
#endif
* `#ifdef` inside an `#ifndef` with the same condition:
.. code-block:: c++
#ifndef FOO
#ifdef FOO // inner ifdef is considered redundant
void f();
#endif
#endif
* `#if` .. `#endif` pairs which are nested inside an outer pair with the same
condition. For example:
.. code-block:: c++
#define FOO 4
#if FOO == 4
#if FOO == 4 // inner if is considered redundant
void f();
#endif
#endif
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