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Computations with value types are more efficient than with reference types because reference types incur an extra level of indirection; reference types exist on the heap and can only be accessed through the handle, while the value type holds its value directly Value types actually live in a limited scope, either as an automatic variable at function scope or in the scope of another object as a field They also do not have the overhead of an object header, as reference types do However, value types are limited in many ways Value types are often copied for example, when used as a method parameter, a copy is automatically created so they are not suitable for large objects; they also cannot be used in inheritance hierarchies, and they don t support more complex and powerful object operations such as copy constructors, nontrivial default constructors, assignment operators, and so on.

I recommend three simple ways to spend less time getting more value out of your RSS feeds: 80/20 your feeds, shortcut your bookmarklets, and track your interests with a Google Blog Search RSS feed.

Human resources department Lotus Notes Name and Address Book Telecom department Security department Multiple groups

The 80/20 idea has been around for a while: 80 percent of your sales come from 20 percent of your customers, 80 percent of your leads come from 20 percent of marketing activities, and so on. The same principle works for information: 80 percent of the value of all the RSS feeds you ve accumulated comes from about 20 percent of the feeds. Organize your feeds into two main folders or groups: the 20 percent that are really worth following, and the rest that you might sporadically scan. Figure 2-14 shows a close-up of what this looks like in FeedDemon.

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Value types are useful for simple aggregates that are frequently passed around or used in computations, such as a complex number, a point, or a simple buffer Reference types are used wherever reference semantics are required and when modeling more complex objects for which the limitations of value types are too restrictive They may inherit from another class and may in turn be inherited from Thus they may be used to model complex objects They are not copied byte for byte (for example, when passed as an argument to a function), rather, they are passed as references, so they may be large and not suffer a penalty from excessive copying They can have special member functions such as default constructors, destructors, copy constructors, and the copy assignment operator (although neither type can have overloaded operators new and delete) The actual objects live on the managed heap The.

Shortcut Your Bookmarklets (Firefox)

Oracle database/Define query. PeopleSoft database/Define query. Lotus Notes database/Define query. Unknown database. Lotus Notes database/What s the original source of this data Multiple sources/Multiple definitions of data.

handle itself is just an address that refers to the object s header (which is 8 bytes in size for the 32-bit CLR) on the heap. Figure 1-1 shows the memory layout of a typical value type and a reference type.

A poorly documented trick in Firefox will save you several steps when you come across a blog to which you want to subscribe. First, you need to be using Firefox (of course) and you need to be using an RSS service like say NewsGator that offers a bookmarklet, which is a tiny JavaScript program that looks like a bookmark. Most online RSS readers and social bookmarking sites offer bookmarklets as a quickie bookmark that you add to your browser and punch whenever you want to subscribe to a blog. This billboard-sized bookmark needs to go on a diet: In Firefox, in the Properties dialog box for the bookmarklet, change the Keyword setting to a nice, short, easy-to-remember code, as shown in Figure 2-15 (I use rsn, for RSS into NewsGator).

As you can see, even when a data source is available, it may not always be the correct place to obtain information However, I can t stress enough how important it is to obtain information as close to the source as possible The fewer dependencies on interim data stores, the better A typical environment may have the data existing on one system (an Oracle table), crude procedures for extracting data and putting it into another system (a different Oracle table with different access rights), and yet another procedure that makes the data available to you via another directory interface In this scenario, you aren t only dependent on the primary data source but also on all the steps that are involved in you pulling it from another directory three steps away You should avoid situations such as these.

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