ENGLISH

Implements Yield for Delphi

By Antonov S.

Book information

Language
english
Format
DOC
Filesize
67 kB (68096 bytes)
Pages
\0
Library
twirpx
Time added
2017-08-07 07:01:42
Библиотека;Компьютерная литература;Borland Delphi

Description

The Russian Delphi programmer Sergey Antonov (or Антонов Сергей - aka. 0xffff) is a real hacker in the positive sense. He approached me with some intriguing assembly code that implements the equivalent of the C# yield statement!Yield makes it easier to implement enumerators (you know the simple classes or records with methods like GetCurrent and MoveNext that enables the for-in statement). Normally you have to implement a kind of state-machine to write an enumerator. With the yield statement this is turned around allowing you to express the iteration using easier to write loops (while, repeat-until or even a for-in loop). Sergey has pulled the impressive feat of implementing a proof-of-concept version of a yield infrastructure and mechanics - without help from the compiler! It may have some limitations, but it is most interesting anyway. Without further ado, here is Sergey's article and code. Make sure you also read the follow-up article on Sergey's blog. Despite some minor language barriers ;), this will be a most interesting blog to follow!Guest article, by Sergey AntonoV

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