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This subsection is a small digression from my main topic, but I think it s worth including. As you ll surely have realized by now, what we re looking at in this area is a minor epidemic of the logical sameness problem. We have: Type vs. class not to mention the term interface, which, as I mentioned in 5, is used in ODMG, at least, to mean another kind of type (or class ) Value vs. immutable object vs. state vs. static object Variable vs. mutable object vs. dynamic object Operator vs. method vs. function vs. procedure16 Read-only operator vs. observer Update operator vs. mutator Object vs. instance vs. value and/or variable Regarding this last one, by the way, you might care to ponder over the following definitions (they re taken from The Unified Modeling Language User Guide, by Grady Booch, James Rumbaugh, and Ivar Jacobson, Addison-Wesley, 1999): Object: A concrete manifestation of an abstraction; an entity with a well-defined boundary that encapsulates state and behavior; an instance of a class. Instance: A concrete manifestation of an abstraction; an entity to which a set of operations can be applied and that has a state that stores the effects of the operations.

16. Procedures resemble our update operators in that they have to be explicitly called, but they don t necessarily update anything. Functions resemble our read-only operators in that they can be invoked inline, but they aren t necessarily read-only (also, the term functions is used even for operators that aren t true functions, in that they return more than one result). We prefer our generic term operator, with read-only and update as qualifiers when appropriate; in other words, we believe the distinction between read-only and update operators is an important logical difference, whereas that between procedures and functions is more just one of syntax.

After executing this, you get the following result: >tfsbuild.exe Microsoft (R) for Microsoft Copyright (C) start sayed-ws2003 Adapdev "Daily Codus Build" TfsBuild Version 8.0.0.0 (R) Visual Studio 2005 Team System Microsoft Corporation 2004. All rights reserved.

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The same book includes a rather strange definition for value and no definition at all for variable. (It also has numerous definitions relating, more or less, to the type vs. class issue; see 4 for further discussion.) By the way, the SQL standard uses the fuzzy term instance as well, and defines it thus: Instance: A physical representation of a value. I have no idea what the standard means by physical representation here; however, I do know it actually uses the term instance to refer to variables as well as values possibly even to variables exclusively.

I have a possible explanation for the widespread failure in the object world to distinguish properly between values and variables. As I ve indicated elsewhere (see in particular the paper Why the Object Model Is Not a Data Model, in my book Relational Database Writings 1994 1997, Addison-Wesley, 1998), it seems to me that the object model is closer to being a model of storage than it is to being a model of data. Certainly this conjecture, if true, would explain a lot about the the object model ! its provision of so many different ways of structuring data, for example, also its heavy reliance on pointers. In fact, it seems to me undeniable that object advocates try to achieve good performance always one of their key objectives by moving users closer to the metal, so to speak (the relational model, by contrast, being further from the metal and at a higher level of abstraction). Now, the distinction between values and variables doesn t make much sense at the storage level in fact, the concepts don t really even exist, as such, at that level. Instead, what we have is storage locations, and those storage locations can be used to hold bit patterns, or in other words encoded representations of values. But there s nothing in general to stop us overwriting any storage location at any time; thus, all storage locations effectively correspond to variables in this sense. And I could be wrong, but I strongly suspect that the concept of objects grew out of this notion of storage locations. Whence, it seems to me, the lack of emphasis if not the total lack of appreciation in the object world regarding the logical difference between values and variables.

I begin each workday by creating a to-do list specifically for that day. Years ago, I would try to cram as many items on the list as I thought I could fit. Don t do that. It s a trap. As Tom points out, workdays never go purely as planned, and you need to leave some margin for error. I still create a daily list, but I leave a generous margin to handle all the ad hoc items that hit me as the day progresses. The to-do list gives me a target that if I can hit it lets me go home feeling proud of having given a good effort and accomplishing some tangible results.

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