Code completion

Match case

Select if you want the letter case to be taken into account for completion suggestions. Choose whether you want to match the case for the first letter or for all letters.

Automatically insert single suggestions for

Automatically complete code if there's just one suggestion for basic and smart type-matching completion.

Sort suggestions alphabetically

Select if you want to sort items in the suggestion list in the alphabetical order instead of sorting them by relevance.

You can change this behavior at any time by clicking in the suggestion list and toggling the Sort by Name option.

Show suggestions as you type

Select if you want the suggestion list to be invoked automatically, without having to call completion explicitly. This option is enabled by default.

Show the documentation popup in

Select to automatically show a popup for each item in the suggestion list with the documentation for the class, method, or field currently highlighted in the lookup list.

In the field to the right, specify the delay (in milliseconds), after which the popup should appear.

Insert parentheses automatically when applicable

If this option is enabled, CLion automatically inserts a pair of opening and closing parentheses when you complete a function/method.

Clear the checkbox to suppress inserting parentheses automatically.

If you use an opening parentheses ( instead of Enter to apply the selected item from a completion list, parentheses will be inserted automatically no matter whether the option is turned on or off.

To use an opening parentheses ( instead of Enter to apply the selected item from a completion list, open the Settings dialog (Ctrl+Alt+S) , go to Editor | General | Code Completion, and select the Insert selected suggestion by pressing space, dot, or other context-dependent keys checkbox.

For more information, refer to Use specific keys to insert suggestions.

Show import items in basic completion

When a symbol that you want to use is not imported in the current file with the corresponding #include, but it is defined in the standard libraries or elsewhere in your solution, you can press Ctrl+Alt+Space to quickly find this symbol in completion suggestions.

You can use this option to include import symbol suggestions into the suggestion lists of automatic and basic completion.

Behavior of import items

Configure the import completion behavior to always insert an include directive or show a menu with an option to add a forward declaration.

Show free functions in members completion

One common C++ coding practice is to prefer non-member non-friend functions to member functions. This is a great way to increase encapsulation and keep class interfaces as minimal as possible. When you type a dot . or an arrow -> after an expression, free functions that accept the expression as the first parameter will be suggested in the completion list after member functions.

Clear this checkbox if you do not want to have free functions in the completion suggestions.

Machine Learning-Assisted Completion

Enable Full line suggestions

Enable Full Line code completion to get suggestions for an entire line of code. Select the language you use in your project; the suggestions will be in gray italics.

Sort completion suggestions based on machine learning

Select this option if you want to use machine learning models to rank the most suitable items higher in the suggestion list. Select the languages for which you want to enable suggestions based on Machine Learning.

Mark position changes in the completion popup

Use the and icons to indicate whether the relevance of a suggestion is increasing or decreasing and therefore the suggestion has moved up or down the suggestion list.

Mark the most relevant item in the completion popup

Use the icon to indicate the most suitable suggestion on the list.

JavaScript

Only type-based completion

By default, CLion suggests completion for symbols regardless of their types. With this approach, in complicated cases the list shows multiple completion variants.

To make completion more precise, select this option. The completion list will strongly depend on the CLion inference. As a result, the list may remain empty in case of poor inference.

Suggest items with optional chaining for nullable types

By default, CLion suggests completion for symbols with the optional chaining operator (?). Clear this checkbox to suppress this behavior.

Expand method bodies in completion for overrides

By default, when you want to override a method from the parent class or interface and select this method from the list of completion suggestions, CLion automatically adds parameters, generates a super() call, and adds the type information, if possible.

Clear this checkbox to suppress automatic generation of method bodies for overrides during completion.

Completion of names

• Suggest variable and parameter names: By default, the checkbox is cleared. When it is selected, CLion suggests names for new class fields, variables, and parameters during their declaration. These suggestions are based on the names of classes, types, and interfaces that are defined in your project, in the libraries you are using, and in standard APIs.

• Suggest names for class fields

  The option is turned off by default.

• Add type annotations for suggested parameter names: Select this checkbox to supply each completion suggestion with information on its type.

  The checkbox is available only when the Suggest variable and parameter names checkbox is selected.

Parameter Info

Show the parameter info popup (in ms)

Select this checkbox to have CLion automatically show a popup with all available method signatures when an opening bracket is typed in the editor, or a method is selected from the suggestion list.

In the text field to the right, specify the delay (in milliseconds) after when the popup window should appear.

If this checkbox is not selected, use Ctrl+P to show parameter info.

Show full method signatures

If this checkbox is selected, the parameter info displays full signatures, including method name and returned type.

SQL

Use aliases in completion for JOIN

Creates aliases for tables in the JOIN statement.

Invert order of operands in auto-generated ON clause

Switches operands in the ON clause. When the checkbox is cleared, the FROM table comes the first in the JOIN condition.

Automatically add aliases when completing table names

Creates an alias for a table name.

Suggest alias names in completion after table names

Suggests an alias for a table name when you use code completion (Ctrl+Space).

Custom aliases (table)

You can add a table name and the alias that you want to use for this table. To add the table-alias pair, click the Add alias button ().