哈希标志在erlang中做了什么？

Question

哈希标志在erlang中做了什么？

record_to_string(#roster{us = {User, _Server},
         jid = JID,
         name = Name,
         subscription = Subscription,
         ask = Ask,
         askmessage = AskMessage}) ->
Username = ejabberd_odbc:escape(User).
....
.

Answer 1

它们与记录一起使用.

Answer 2

只是为了完整(如果有人谷歌"Erlang哈希"):

哈希符号也可用于定义具有任意基数的整数,如16#deadbeef = 3735928559.

Answer 3

它们与Erlang中的Records有关.事实上,在Erlang中创建,访问和更新记录等每个操作都是使用#http://20bits.com/articles/erlang-an-introduction-to-records/完成的.

Answer 4

如果一条记录是这样定义的：

-record(record_name, {first_field, second_field}).

您可以通过多种方式使用哈希来访问记录，其中：

% create a new record and put it in a variable
Record = #record_name{first_field = 1, second_field = 2},

% get only the second_field of Record
Field = Record#record_name.second_field,

% create a new record from Record, but with a different first_field
Record2 = Record#record_name{first_field = 5}.