Another good book by John Chambers: "Programming with Data: A Guide to the S Language". As the name suggests it is actually about S, not R, but it provides a lot of valuable information about S4 classes anyway.
There's also some information in the R manuals "Writing R Extensions" and "R Internals" (particularly the latter). Those can be found at http://cran.r-project.org/doc/manuals/.
Finally, I would recommend "How S4 Methods Work", which is a great overview of how to think about S4 as it fits into R.
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R 程序员 (Matloff)（免费）和 科学编程和模拟简介（琼斯）有一个关于“新风格”的简短部分S4班。
R for programmers (Matloff) (free) and Introduction to scientific programming and simulation (Jones) have a short section on "new-style" S4 classes.
John Chambers 的另一本好书：《Programming with Data: A Guide to the S Language》。顾名思义，它实际上是关于 S，而不是 R，但无论如何它提供了很多关于 S4 类的有价值的信息。
R 手册“Writing R Extensions”和“R Internals”（特别是后者）中也有一些信息。这些可以在 http://cran.r-project.org/doc/manuals/< /a>.
最后，我会推荐“S4方法如何工作”，它很好地概述了如何工作考虑 S4 是否适合 R。
Another good book by John Chambers: "Programming with Data: A Guide to the S Language". As the name suggests it is actually about S, not R, but it provides a lot of valuable information about S4 classes anyway.
There's also some information in the R manuals "Writing R Extensions" and "R Internals" (particularly the latter). Those can be found at http://cran.r-project.org/doc/manuals/.
Finally, I would recommend "How S4 Methods Work", which is a great overview of how to think about S4 as it fits into R.
我对 S4 的文章（仍在进行中）可以在这里找到：http://adv-r .had.co.nz/S4.html
My write up of S4 (still in progress) is available here: http://adv-r.had.co.nz/S4.html