Support for C++20 Modules
Modules were introduced in the C++20 standard. They work as alternative to some use cases of header files and help share declarations and definitions across translation units.
CLion collects information from .ixx, .cppm, and .mxx files, parses export module {name} statements and creates mappings between {name} and module filenames. Then, the mappings are passed to the Clangd engine and used to provide coding assistance and highlighting.
If you update the module’s code or rename the module, CLion will automatically parse the changes. The information collected from modules is preserved between the IDE restarts.
CLion's support for modules has been tested in the following environments:
CMake, Ninja generator, Visual Studio C++ toolchain.
CMake, Visual Studio generator, Visual Studio C++ toolchain.
CMake, Clang toolchain with compiler flags.
Code insight for Modules
CLion highlights module keywords (
import,export, andmodule):
Completion works for symbols from modules:
You can navigate between declarations and definitions of symbols from modules using Ctrl+B:
Find Usages and refactorings are available inside modules.
There are also early versions of the Rename, Change Signature, and Extract refactorings that work across module boundaries (for now, they only work for files opened in CLion).
Adding modules
In CLion, you can add new modules to your project automatically.
In the project tree, right-click the folder where you want to add a module and select :
Specify the module name, its type (extension), and whether you want CLion to add the newly created module to an existing CMake target:
A new module will be created in your project tree and added to the CMakeLists.txt script if you chose that option:
You can edit the template that CLion uses when creating module files in :
