The Extract Variable refactoring puts the result of the selected expression into a variable. It declares a new variable and uses the expression as an initializer. The original expression is replaced with the new variable.
You can select the expression to be replaced with a variable yourself. You can as well use smart expression selection In this case CLion will help you select the desired expression.
Extract a variable in-place
In the editor, select the expression to be replaced with a variable. You can do that yourself or use the smart expression selection feature to let CLion help you. So, do one of the following:
Highlight the expression. Then chooseon the main menu or on the context menu.
Alternatively, press Ctrl+Alt+V.
Place the cursor before or within the expression. Chooseon the main menu or on the context menu. or press Ctrl+Alt+V.
If more than one occurrence of the selected expression is found, select Replace this occurrence only or Replace all occurrences in the Multiple occurrences found popup menu. To select the required option, just click it. Alternatively, use the Up and Down arrow keys to navigate to the option of interest, and press Enter to select it.
Specify the name of the variable. Do one of the following:
Select one of the suggested names from the list. To do that, double-click the suitable name. Alternatively, use the Up and Down arrow keys to navigate to the name of interest, and Enter to select it.
Edit the name by typing. The name is shown in the box with red borders and changes as you type. When finished, press Enter.
If you want to apply automatic type declaration for the variable, select the Select auto checkbox in the popup
Note that the IDE saves your choice as default setting for the next attempt of the Extract variable refactoring.