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# Chromium Objective-C and Objective-C++ style guide
_For other languages, please see the [Chromium style guides](https://chromium.googlesource.com/chromium/src/+/main/styleguide/styleguide.md)._
Chromium follows the
[Google Objective-C style guide](https://google.github.io/styleguide/objcguide.html)
unless an exception is listed below.
A checkout should give you
[clang-format](https://chromium.googlesource.com/chromium/src/+/main/docs/clang_format.md)
to automatically format Objective-C and Objective-C++ code. By policy, Clang's
formatting of code should always be accepted in code reviews. If Clang's
formatting doesn't follow this style guide, file a bug.
## Line length
For consistency with the 80 character line length used in Chromium C++ code,
Objective-C and Objective-C++ code also has an 80 character line length.
## Chromium C++ style
Where appropriate, the [Chromium C++ style](../c++/c++.md) style guide applies
to Chromium Objective-C and (especially) Objective-C++
## Code Formatting
Use `nil` for null pointers to Objective-C objects, and `nullptr` for C++
objects.
## Objective-C++ style matches the language
Within an Objective-C++ source file, follow the style for the language of the
function or method you're implementing.
In order to minimize clashes between the differing naming styles when mixing
Cocoa/Objective-C and C++, follow the style of the method being implemented.
For code in an `@implementation` block, use the Objective-C naming rules. For
code in a method of a C++ class, use the C++ naming rules.
For C functions and constants defined in a namespace, use C++ style, even if
most of the file is Objective-C.
`TEST` and `TEST_F` macros expand to C++ methods, so even if a unit test is
mostly testing Objective-C objects and methods, the test should be written using
C++ style.
## #import and #include in the `ios/` directory
#import directive can be used to import C++ and Objective-C headers for all
source code in the `ios/` directory. This differs from the Google Objective-C Style
Guide, which requires using #include directive for C++ headers.
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