Spreadsheet::Engine::Fn::depreciation - base class for depreciation functions

  use base 'Spreadsheet::Engine::Fn::depreciation';

  sub depreciate { ... }

This provides a base class for spreadsheet functions that perform different methods of depreciation.

Subclasses should provide a 'depreciate' function that will be called with the cost, salvage, and lifetime operands. (Other operands can be taken from the stack if required.)

This is a Modified Version of code extracted from SocialCalc::Functions in SocialCalc 1.1.0

Portions (c) Copyright 2005, 2006, 2007 Software Garden, Inc. All Rights Reserved.

Portions (c) Copyright 2007 Socialtext, Inc. All Rights Reserved.

Portions (c) Copyright 2008 Tony Bowden

The contents of this file are subject to the Artistic License 2.0; you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.perlfoundation.org/artistic_license_2_0