- CLion supports only the following C and C++ standards: C99, C++03, C++11.
- Unsupported C++11 features
- User defined literals
Variadic templates(available since CLion 1.5)
Performance and memory
- On the large code bases (especially when using Boost) performance and memory issues during indexing and editing are possible.
- Increasing memory may help to resolve performance problems. To check the memory usage, please, switch on the memory indicator in Preferences/Settings | Appearance & Behavior | Appearance | Show memory indicator.