entitySelection.copy( )

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4D v19.8


entitySelection.copy ( {option} ) -> Result

Parameter	Type	Description
option	Longint	ck shared: return a shareable entity selection
Result	EntitySelection	Copy of the entity selection

Description

The entitySelection.copy( ) function returns a copy of the original entity selection.

Note: This function does not modify the original entity selection.

By default, if the option parameter is omitted, the function returns a new, non-shareable entity selection (even if the function is applied to a shareable entity selection). Pass the ck shared constant in the option parameter if you want to create a shareable entity selection.

Note: For information on the shareable property of entity selections, please refer to the Shareable vs Alterable entity selections paragraph.

Example

You create a new, empty entity selection of products when the form is loaded:

 Case of

    :(Form event code=On Load)

       Form.products:=ds.Products.newSelection()

 End case

Then this entity selection is updated with products and you want to share the products between several processes. You copy the Form.products entity selection as a shareable one:

 ...

  // The Form.products entity selection is updated

 Form.products.add(Form.selectedProduct)

 

 Use(Storage)

    If(Storage.products=Null)

       Storage.products:=New shared object()

    End if

 

    Use(Storage.products)

       Storage.products:=Form.products.copy(ck shared)

    End use

 End use