Definition: '.scalafmt.conf': A configuration file that specifies how to compile and format C++ source code. Detailed definition: `.scalafmt.conf` is a configuration file used in a build system called `scalafmt`, which allows for more dynamic compilation and formatting of C++ source files using the `scalgo` compiler. The `scalafmt` system automates this process by providing a user-friendly interface to compile, lint, and format your code. The `.scalafmt.conf` file specifies how to compile and format C++ source files. It includes options for various formats such as 'cpp', 'c++', 'c++-std', etc., which can be used to control the output format. This allows you to customize the output in different ways, ensuring your code is written to meet specific standards or requirements.