RPGLE(PROCPTR)中的过程指针 [英] Procedure pointers in RPGLE (PROCPTR)

问题描述

任何人都可以提供这些有趣的用法示例吗?

Can anyone provide any interesting usage examples of these?

推荐答案

jjujuma，

对于一个简单的示例，您可以使用它来实现一些面向对象的样式过程，例如Draw.您可以通过将Circle_Draw或Square_Draw的相应％PADDR分配给Draw过程指针，来为Circle调用Circle_Draw过程或为Square调用Square_Draw过程.调用Draw过程指针时，您将隐藏正在调用的过程(Circle_Draw或Square_Draw).

For a trivial example you could use this to implement some Object Oriented style procedure like Draw. You'd call a Circle_Draw procedure for a Circle or a Square_Draw procedure for a Square by assigning the appropriate %PADDR of the Circle_Draw or Square_Draw to your Draw procedure pointer. When calling the Draw procedure pointer you hide which procedure (Circle_Draw or Square_Draw) you're calling.

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