[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] | Reference for unit 'System' (#rtl)

# TInterfacedObject.BeforeDestruction

Check reference count.

## Declaration

Source position: objpash.inc line 310

`public procedure TInterfacedObject.BeforeDestruction; override;`

## Description

AfterConstruction overrides the basic method in TObject and adds a reference count check: if the reference count is not zero, an error occurs.

## Errors

A runtime-error 204 will be generated if the reference count is nonzero when the object is destroyed.

## See also

AfterConstruction |  | Handle reference count properly.

Documentation generated on: May 14 2021