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Re: Lightweight Structs - Practical Example (Data Types in Mathematica)

• To: mathgroup at smc.vnet.net
• Subject: [mg63385] Re: Lightweight Structs - Practical Example (Data Types in Mathematica)
• From: "Frank Iannarilli" <frankeye at cox.net>
• Date: Wed, 28 Dec 2005 03:55:41 -0500 (EST)
• References: <dor2p2$amu$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Here's some strengthening of the approach (thanks to my friend Steve
Jones for pointing out weaknesses).


1. Protect the instance ID symbols from accidental definition, which
would sow havoc into any existing structs. Indeed, strengthen the
struct "constructor" to insure this:
   makeSensor[id_Symbol] := Module[{},
     Protect[id];
     Sensor[id]@radius = 0;
     Sensor[id]]

2. Similarly, Protect[] the fieldname symbols:
    Protect[radius]