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An iterator block is a special method that allows you to easily implement iterators in your code. The simplest way of creating an iterator block is to implement a method with the name GetEnumerator, which returns System.Collections.Generic.IEnumerator<T>, where T is the type of object you are going to provide for enumeration. Listing 9-55 contains an example. Listing 9-55. Creating an Iterator Block using System.Collections.Generic; class Counter { public IEnumerator<int> GetEnumerator() { for (int i = 0; i < 5; i++) { yield return i; } } } An iterator block is identified by the presence of the yield keyword. When the C# compiler detects an iterator block, it rewrites your class so that it implements the System.Collections.Generic.IEnumerator<T> and System.Collections.IEnumerator interfaces. Interfaces are described in 12, and the System.Collections namespaces are described later in the book. You don t have to worry about the changes that are made, just the effect that they have. When you put an iterator block in your class, you can then use an instance of that class as though it were an IEnumerator<T>, where T is the type of data that your iterator block returns. Here is a simple example using the Counter class in Listing 9-55: using System; class Listing 55 Test { static void Main(string[] args) { // create a new instance of the Counter class Counter count = new Counter(); // use the counter instance as the source for a foreach loop foreach (int i in count) { Console.WriteLine("Value: {0}", i); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } }

I create an instance of the Counter class and then use it as the source in a foreach loop, printing out each value that the loop generates. Compiling and running the previous code and the code in Listing 955 produces the following results: Value: 0 Value: 1 Value: 2 Value: 3 Value: 4 Press enter to finish

The Pluggable Authentication Service (PAS) 206 The PAS in Plone 207 The Plug-in Types 207 Managing Users Through the acl_users Tool 209 Authentication with LDAP 212 Installing Plone app ldap 213 Configuring Your LDAP Connection 213 Configuring Your LDAP Connection Through the ZMI 215 Authentication with Relational Databases 216 Summary 219.

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The magic in Listing 9-55 comes from the yield keyword. When yield is followed by the return keyword, the value that follows will be exposed to the iterator. This is what happened in Listing 9-55: public IEnumerator<int> GetEnumerator() { for (int i = 0; i < 5; i++) { yield return i; } } I placed the yield return statement in a for loop. Each time the loop body was executed, the yield return produced a value for the iterator output, which is the source of the incrementing results shown in the previous section. The alternative use of the yield keyword is with the break keyword. This indicates that no more values are available. This is useful if you are using a loop of some kind and want to end execution prematurely. Listing 9-56 contains an example. Listing 9-56. Using a yield break Statement using System; using System.Collections.Generic; class Counter { public IEnumerator<int> GetEnumerator() { int resultCount = 0; int result = 0; while (true) { if (resultCount < 5) { resultCount++; yield return result++; } else { yield break; } } } }

boundary checking and null termination When using other standard C library functions, however, strings may not get correctly null terminated, and keeping track of exactly how much room is left in buffers can get tricky Also, identifying all occurrences of calls to the standard C library functions and modifying the code might require a lot of work In the following subsections, we describe some additional approaches that can be used to mitigate buffer overflow vulnerabilities While we have illustrated buffer overflow vulnerabilities in C, you might be wondering if programs in other languages, such as C++ and Java, might be vulnerable The short answer is that in any language that is complied, the compiler usually does not do (and is not capable of doing) the checking required to identify potential buffer overflows and remedy the situation.

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