Erlang型系统 [英] Erlang type system

问题描述

我一直在搜索网络寻找Erlang程序的各种打字实践，似乎有几个...虽然它有点难以找到一个固定的信息源
即Im寻找实用信息关于：

I've been scrounging around the web looking for various typing practices of Erlang programs and there seem to be a few... although its somewhat difficult to find a solid source of info namely Im looking for practical info about:

1。 -specs - 这个看起来很有吸引力。几个地方提到，在编译时检查具有关联的-specs指令的函数（正确的类型使用）...我似乎没有找到更多关于如何使用它的信息（使用哪种工具 - 透析器， TYPER？）。我真的很想创建一个小的解析器/代码，它将从

1.-specs - this one looks pretty attractive. a few places mention that the functions that have an associated -specs directive with it are checked at compile time(for correct type usage)... I cant seem to find more info on how to use it (which tool to use - Dialyzer,TypEr?). Im really eager to create a small parser/code-gen that would generate these "specs" from function declarations of the form

functionName(param1 :List, param2 :Tuple) -> ...

我还没有看到 -spec 支持抽象类型（用户声明类型 - Car类型 -

I have not seen if -spec supports abstract types (user declared types - "Car" type -

{car,{weight,_},{height,_},{maxSpeed,_}}

2。 -deftype 指令这里提到的

如果我可以开始打字，并在编译时检查它，Erlang将变得更加强大，上面提到的解析器/代码生成的运行时会产生

Erlang would become so much more powerful for me, if I could start typing things and have them be checked at compile time. The run-time the parser/code-gen I mentioned above would generate guard type checks in the output source-code.

推荐答案

更多有关此类型和规范属性的信息：

More info on the type and spec attributes here:

http://www.erlang.org/ eeps / eep-0008.html

透析器可用于检查它们（请参阅 dialyzer --help ）。

Dialyzer can be used to check them (see dialyzer --help).

可以用Typer来生成m（见 typer --help ）。

Typer can be used to generate them (see typer --help).

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