Erlang中的元组模块是什么？ [英] What is a tuple module in Erlang?

问题描述

http://www.erlang.org/news/35 提到这将被记录在案，但我可以在文档中找不到。

http://www.erlang.org/news/35 mentioned that this will be documented, but I can't find it in the documentation.

推荐答案

元组是一个包含两个元素的元组，一个模块的名称和一个额外的参数列表。例如：

A "tuple module" is a tuple with two elements, the name of a module and a list of extra arguments. For example:

{my_module, [foo, bar]}

在函数调用中，可以使用这样的元组而不是模块名称。在这种情况下，被调用的函数将在参数列表的末尾作为附加参数获取有问题的元组：

Such a tuple can be used instead of a module name in function calls. In this case, the function being called will get the tuple in question as an additional argument at the end of the argument list:

3> Module = {lists, [[foo]]}.
{lists,[[foo]]}
4> Module:append([bar]).
[bar|{lists,[[foo]]}]

到：

7> lists:append([bar], {lists, [[foo]]}).
[bar|{lists,[[foo]]}]

保存元组模块为了向后兼容，因为它们是从语言中删除的参数化模块的实施机制在R16。

Tuple modules are kept for backwards compatibility, as they were the implementation mechanism for parameterised modules, which were removed from the language in R16.

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