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.. title:: clang-tidy - misc-use-anonymous-namespace
misc-use-anonymous-namespace
============================
Finds instances of ``static`` functions or variables declared at global scope
that could instead be moved into an anonymous namespace.
Anonymous namespaces are the "superior alternative" according to the C++
Standard. ``static`` was proposed for deprecation, but later un-deprecated to
keep C compatibility [1]. ``static`` is an overloaded term with different meanings in
different contexts, so it can create confusion.
The following uses of ``static`` will *not* be diagnosed:
* Functions or variables in header files, since anonymous namespaces in headers
is considered an antipattern. Allowed header file extensions can be configured
via the `HeaderFileExtensions` option (see below).
* ``const`` or ``constexpr`` variables, since they already have implicit internal
linkage in C++.
Examples:
.. code-block:: c++
// Bad
static void foo();
static int x;
// Good
namespace {
void foo();
int x;
} // namespace
Options
-------
.. option:: HeaderFileExtensions
Note: this option is deprecated, it will be removed in :program:`clang-tidy`
version 19. Please use the global configuration option
`HeaderFileExtensions`.
A semicolon-separated list of filename extensions of header files (the filename
extensions should not include "." prefix). Default is ";h;hh;hpp;hxx".
For extension-less header files, using an empty string or leaving an
empty string between ";" if there are other filename extensions.
[1] `Undeprecating static <https://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1012>`_
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