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the FileStream object . In a garbage-collected environment, new objects are allocated contiguously in memory, providing performance gains resulting from locality of reference . Specifically, this means that your process s working set will be smaller than a similar application running in a non-managed environment . It s also likely that the objects that your code is using can all reside in the CPU s cache . Your application will access these objects with phenomenal speed because the CPU will be able to perform most of its manipulations without having cache misses that would force slower access to RAM . So far, it sounds as if the managed heap is far superior to the C-runtime heap because of its simplicity of implementation and speed . But there s one little detail you should know about before getting too excited . The managed heap gains these advantages because it makes one really big assumption: that address space and storage are infinite . Obviously, this assumption is ridiculous, and the managed heap must employ a mechanism to allow it to make this assumption . This mechanism is the garbage collector . Here s how it works: When an application calls the new operator to create an object, there might not be enough address space left in the region to allocate to the object . The heap detects this lack of space by adding the bytes that the object requires to the address in NextObjPtr . If the resulting value is beyond the end of the address space region, the heap is full, and a garbage collection must be performed . Important What I ve just said is an oversimplification . In reality, a garbage collection occurs

when generation 0 is full . Some garbage collectors use generations, a mechanism whose sole purpose is to improve performance . The idea is that newly created objects are part of a young generation and objects created early in the application s lifecycle are in an old generation . Objects in generation 0 are objects that have recently been allocated and have never been examined by the garbage collector algorithm . Objects that survive a collection are promoted to another generation (such as generation 1) . Separating objects into generations allows the garbage collector to collect specific generations instead of collecting all of the objects in the managed heap . I ll explain generations in more detail later in this chapter . Until then, it s easiest for you to think that a garbage collection occurs when the heap is full .

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This second version is simpler. My guess is that you ll read the boolean expression in the if test without any difficulty.

The garbage collector checks to see if any objects in the heap are no longer being used by the application . If such objects exist, the memory used by these objects can be reclaimed . (If no more memory is available in the heap after a garbage collection, new throws an OutOfMemoryException .) How does the garbage collector know whether the application is using an object As you might imagine, this isn t a simple question to answer . Every application has a set of roots . A single root is a storage location containing a memory pointer to a reference type object . This pointer either refers to an object in the managed heap or is set to null . For example, a static field (defined within a type) is considered a root . In addition, any method parameter or local variable is considered a root . Only variables that

Create your own boolean type, if necessary Some languages, such as C++, Java, and Visual Basic have a predefined boolean type. Others, such as C, do not. In languages such as C, you can define your own boolean type. In C, you d do it this way:

are of a reference type are considered roots; value type variables are never considered roots . Now, let s look at a concrete example starting with the following class definition:

Declaring variables to be BOOLEAN rather than int makes their intended use more obvious and makes your program a little more self-documenting.

Using Windows Explorer, navigate to the Framework directory, right-click, and choose SVN Checkout. The Checkout dialog box opens (see figure 2.12). You can read the repository URL in the VisualSVN Server Management Console (shown earlier in figure 2.9). After you enter the server URL, and click OK, TortoiseSVN informs you that the folder you re trying to check out to isn t empty (see figure 2.13).

internal sealed class SomeType { private TextWriter m_textWriter; public SomeType(TextWriter tw) { m_textWriter = tw; } public void WriteBytes(Byte[] bytes) { for (Int32 x = 0; x < bytes.Length; x++) { m_textWriter.Write(bytes[x]); } } }

An enumerated type is a type of data that allows each member of a class of objects to be described in English. Enumerated types are available in C++, and Visual Basic and are generally used when you know all the possible values of a variable and want to express them in words. Here are several examples of enumerated types in Visual Basic:

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