.. title:: clang-tidy - misc-unused-using-decls
misc-unused-using-decls
=======================
Finds unused ``using`` declarations.
Unused ``using``` declarations in header files will not be diagnosed since these
using declarations are part of the header's public API. Allowed header file
extensions can be configured via the global option `HeaderFileExtensions`.
Example:
.. code-block:: c++
// main.cpp
namespace n { class C; }
using n::C; // Never actually used.