CLion 2016.2 Help

Extract Variable

Basics

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.

This refactoring is also available for JavaScript .

Extracting variable in-place

To extract a variable using in-place refactoring, follow these steps

  1. 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 choose Refactor | Extract | Variable on the main menu or on the context menu.

      Alternatively, pressCtrl+Alt+V.

    • Place the cursor before or within the expression. Choose Refactor | Extract Variable on the main menu or on the context menu. or pressCtrl+Alt+V.
  2. 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 pop-up 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.
  3. Specify the name of the variable. Do one of the following:
    • Select one of the suggested names from the pop-up 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, pressEnter.
  4. If you want to apply automatic type declaration for the variable, select the Select auto check box in the pop-up:
    cl_extractVariable
    Note, that the IDE saves your choice as default setting for the next attempt of the Extract variable refactoring.

See Also

External Links:

Last modified: 22 November 2016