xref: /llvm-project/clang-tools-extra/docs/clang-tidy/checks/misc/unused-using-decls.rst (revision cc38cd856d9a9df77d5d727377e38a891807774b) 
1.. title:: clang-tidy - misc-unused-using-decls
2
3misc-unused-using-decls
4=======================
5
6Finds unused ``using`` declarations.
7
8Unused ``using``` declarations in header files will not be diagnosed since these
9using declarations are part of the header's public API. Allowed header file
10extensions can be configured via the global option `HeaderFileExtensions`.
11
12Example:
13
14.. code-block:: c++
15
16  // main.cpp
17  namespace n { class C; }
18  using n::C;  // Never actually used.
19