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Delphi Cookbook - Second Edition
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When the for...in loop was introduced in Delphi 2005, the concept of enumerable types was also introduced into the Delphi language.
As you know, there are some built-in enumerable types. However, you can create your own enumerable types using a very simple pattern.
To make your container enumerable, implement a single method called GetEnumerator, that must return a reference to an object, interface, or record, that implements the following three methods and one property (in the sample, the element to enumerate is TFoo):
function GetCurrent: TFoo; function MoveNext: Boolean; property Current: TFoo read GetCurrent;
There are a lot of samples related to standard enumerable types, so in this recipe you'll look at some not-so-common utilizations.
In this recipe, you'll see a file enumerable function as it exists in other, mostly dynamic, languages. The goal is to enumerate all the rows in a text file without actually opening, reading, and...
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