On this page:
- Change the function name.
- Add new parameters and remove the existing ones. Note that you can also add a parameter using a dedicated Extract Parameter refactoring.
- Reorder parameters.
- Change parameter names.
- Propagate new parameters through the method call hierarchy.
The following table shows 4 different ways of performing the same Change Signature refactoring.
In all the cases, the function
result() is renamed to
a new parameter
input is added to this function.
The examples show how the function call, the calling function (
other code fragments may be affected depending on the refactoring settings.
Changing function signature
To change a function signature
- In the editor, place the cursor within the name of the function whose signature you want to change.
- Do one of the following:
- In the Change Signature dialog,
make the necessary changes to the function signature and specify which other, related changes are
- Change the function name. To do that, edit the text in the Name field.
Manage the function parameters using the table of parameters and the buttons to the right of it:
- To add a new parameter, click (N/A)
and specify the properties of the new parameter in the corresponding fields.
When adding parameters, you may want to propagate these parameters to the functions that call the current function.
- To remove a parameter, click any of the cells in the corresponding row and click (⌥⌦).
- To reorder the parameters, use (⌥↑) and (⌥↓). For example, if you wanted to make a certain parameter the first in the list, you would click any of the cells in the row corresponding to that parameter, and then click the required number of times.
- To change the name of a parameter, make the necessary edits in the corresponding table cell.
- To add a new parameter, click (N/A) and specify the properties of the new parameter in the corresponding fields.
- Propagate new function parameters (if any) along the
hierarchy of the functions that call the current function.
(There may be the functions that call the function whose signature you are changing. These functions, in their turn, may be called by other functions, and so on. You can propagate the changes you are making to the parameters of the current function through the hierarchy of the calling functions and also specify which calling functions should be affected and which shouldn't.)
To propagate the new parameters:
- Click .
- In the left-hand pane of the Select Methods to Propagate New Parameters dialog,
expand the necessary nodes and select the check boxes next to the functions you want
the new parameters to be propagated to.
To help you select the necessary functions, the code for the calling function and the function being called is shown in the right-hand part of the dialog (in the Caller Method and Callee Method panes respectively).
As you switch between the functions in the left-hand pane, the code in the right-hand part changes accordingly.
- Click OK.
- To perform the refactoring right away, click Refactor.
To see the expected changes and make the necessary adjustments prior to actually performing the refactoring, click Preview.