| Name |
Kommentar |
| 16675) |
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| Nam |
| namhargraves(at)alice(dot)it |
Ort: Malmberget |
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| 16674) |
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| Moses |
| moses_willason(at)yahoo(dot)com |
Ort: Agarn |
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| 16673) |
|
| Neal |
| nealboston(at)hotmail(dot)co(dot)uk |
Ort: Bibern |
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The choice of whether to use WITH-SLOTS versus WITH-ACCESSORS is the same as the choice between SLOT-VALUE and an accessor function: low-level code that provides the basic functionality of a class may use SLOT-VALUE or WITH-SLOTS to directly manipulate slots in ways not supported by accessor functions or to explicitly avoid the effects of auxiliary methods that may have been defined on the accessor functions.
SLOT-VALUE takes an object and the name of a slot as arguments and returns the value of the named slot in the given object. But if you don't supply a :customer-name argument, the customer-name slot will be unbound, and an attempt to read it before you set it will signal an error.
Nginx has a concept of request processing time - time elapsed since the first bytes were read from the client. You can also use initforms that generate a different value each time they're evaluated--the initform is evaluated anew for each object. For now, however, you're ready to take a break from all this theory of object orientation and turn to the rather different topic of how to make good use of Common Lisp's powerful, but sometimes cryptic, FORMAT function. In Chapter 23 you'll see an example of how to define a method on PRINT-OBJECT to make objects of a certain class be printed in a more informative form.
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| 16672) |
|
| Katrin |
| katrinlandry(at)hotmail(dot)com |
Ort: Flateyri |
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There should be a printing somewhere - for mainboards it should be between the expansion slots or near the RAM slots.
There are multiple strategies to measure CPU time: you may use special tools called profilers to employ CPU sampling or develop a microbenchmark to test the suspicious piece of the code. Then, print-statement, called on a money-market-account, will print a basic account statement, output by the primary method specialized on bank-account, followed by details output by the :after methods specialized on savings-account and checking-account.
The disadvantage is that you don't get fine-grained control over the order in which the auxiliary methods run--if you wanted the checking-account part of the statement to print before the savings-account part, you'd have to change the order in which the money-market-account subclasses those classes.
In that case, the rule that subclasses are more specific than their superclasses isn't enough to order all the superclasses. This rule is admittedly somewhat arbitrary but does allow every class to have a linear class precedence list, which can be used to determine which superclasses should be considered more specific than others.
Common Lisp also supports multiple inheritance--a class can have multiple direct superclasses, inheriting applicable methods and slot specifiers from all of them.
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| 16671) |
|
| Kattie |
| kattiedozier(at)sbcglobal(dot)net |
Ort: Auw An Der Kyll |
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| 16670) |
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| Thorsten |
| thorstenchristy(at)hotmail(dot)com |
Ort: Manchester |
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| 16669) |
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| Danilo |
| danilocomo(at)bigpond(dot)com |
Ort: Warszawa |
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| 16668) |
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| Lucia |
| luciapigott(at)terra(dot)com(dot)br |
Ort: Gjovik |
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| 16667) |
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| Yanira |
| yanira(dot)ainslie(at)gmx(dot)de |
Ort: Vandoeuvre-Les-Nancy |
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| 16666) |
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| Velda |
| veldajohn(at)gmail(dot)com |
Ort: Strajach |
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