有没有办法在ocaml中打印用户定义的数据类型? [英] Is there a way to print user-defined datatypes in ocaml?

问题描述

我不能使用print_endline，因为它需要一个字符串，而且我不(想)我有任何方法可以将我非常简单的用户定义数据类型转换为字符串.如何检查这些数据类型的变量值?

I can't use print_endline because it requires a string, and I don't (think) I have any way to convert my very simple user-defined datatypes to strings. How can I check the values of variables of these datatypes?

推荐答案

在许多情况下，编写自己的string_of_转换例程并不难.这是一个简单的替代方案，不需要任何额外的库或非标准的OCaml扩展.对于我使用OCaml教授的课程，这通常是学生最简单的机制.

In many cases, it's not hard to write your own string_of_ conversion routine. That's a simple alternative that doesn't require any extra libraries or non-standard OCaml extensions. For the courses I teach that use OCaml, this is often the simplest mechanism for students.

(不过，如果支持对字符串的通用转换会很好；也许OCaml派生的东西会流行起来.)

(It would be nice if there were support for a generic conversion to strings though; perhaps the OCaml deriving stuff will catch on.)

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