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.. title:: clang-tidy - readability-avoid-unconditional-preprocessor-if
readability-avoid-unconditional-preprocessor-if
===============================================
Finds code blocks that are constantly enabled or disabled in preprocessor
directives by analyzing ``#if`` conditions, such as ``#if 0`` and ``#if 1``,
etc.
.. code-block:: c++
#if 0
// some disabled code
#endif
#if 1
// some enabled code that can be disabled manually
#endif
Unconditional preprocessor directives, such as ``#if 0`` for disabled code
and ``#if 1`` for enabled code, can lead to dead code and always enabled code,
respectively. Dead code can make understanding the codebase more difficult,
hinder readability, and may be a sign of unfinished functionality or abandoned
features. This can cause maintenance issues, confusion for future developers,
and potential compilation problems.
As a solution for both cases, consider using preprocessor macros or defines,
like ``#ifdef DEBUGGING_ENABLED``, to control code enabling or disabling.
This approach provides better coordination and flexibility when working with
different parts of the codebase. Alternatively, you can comment out the entire
code using ``/* */`` block comments and add a hint, such as ``@todo``,
to indicate future actions.
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