File: confusable-identifiers.rst

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.. title:: clang-tidy - misc-confusable-identifiers

misc-confusable-identifiers
===========================

Warn about confusable identifiers, i.e. identifiers that are visually close to
each other, but use different Unicode characters. This detects a potential
attack described in `CVE-2021-42574 <https://www.cve.org/CVERecord?id=CVE-2021-42574>`_.

Example:

.. code-block:: text

    int fo; // Initial character is U+0066 (LATIN SMALL LETTER F).
    int 𝐟o; // Initial character is U+1D41F (MATHEMATICAL BOLD SMALL F) not U+0066 (LATIN SMALL LETTER F).