Posts Tagged ‘map’

Erlang 新数据类型Map的定位和性能

March 12th, 2014 4 comments

原创文章,转载请注明: 转载自系统技术非业余研究

本文链接地址: Erlang 新数据类型Map的定位和性能

Erlang R17最大的语言层面的变化莫过是引入 Map数据结构,参见:Erlang R17新特性浅评 还有 这里

Map相关的细节在EEP 43上,参见 这里


A record replacement is just that, a replacement. It’s like asking the question, “What do we have?” instead of “What can we get?” The instant rebuttal would be “What do we need?” I say Maps.


The new data-type shall have semantics, syntax and operations that:

> provides an association set from key terms to value terms which can be constructed, accessed and updated using language syntax
> can be uniquely distinguished from every other data-type in the language
> has no compile-time dependency for constructing, accessing or updating contents of maps nor for passing maps between modules, processes or over Erlang distribution
> can be used in matching expressions in the language
> has a one-to-one association between printing and parsing the data-type
> has a well defined order between terms of the type and other Erlang types
> has at most O(log N) time complexity in insert and lookup operations, where N is the number of key-value associations.

思遥同学很贴心的写了一篇maps的分析,参看 Erlang 的新数据结构 map 浅析

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Categories: Erlang探索, 源码分析 Tags: ,