douxian1892
2016-03-08 12:11
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Golang中的空语句是什么?

In Python we can use pass clause as an placeholder.
What is the equivalent clause in Golang?
An ; or something else?

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在Python中,我们可以使用 pass 子句作为占位符。
什么是
An ; 或其他名称?

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1条回答 默认 最新

  • douyou8047 2016-03-08 12:15
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    The Go Programming Language Specification

    Empty statements

    The empty statement does nothing.

    EmptyStmt = .

    Notation

    The syntax is specified using Extended Backus-Naur Form (EBNF):

    Production  = production_name "=" [ Expression ] "." .
    Expression  = Alternative { "|" Alternative } .
    Alternative = Term { Term } .
    Term        = production_name | token [ "…" token ] | Group | Option | Repetition .
    Group       = "(" Expression ")" .
    Option      = "[" Expression "]" .
    Repetition  = "{" Expression "}" .
    

    Productions are expressions constructed from terms and the following operators, in increasing precedence:

    |   alternation
    ()  grouping
    []  option (0 or 1 times)
    {}  repetition (0 to n times)
    

    Lower-case production names are used to identify lexical tokens. Non-terminals are in CamelCase. Lexical tokens are enclosed in double quotes "" or back quotes ``.

    The form a … b represents the set of characters from a through b as alternatives. The horizontal ellipsis … is also used elsewhere in the spec to informally denote various enumerations or code snippets that are not further specified. The character … (as opposed to the three characters ...) is not a token of the Go language.

    The empty statement is empty. In EBNF (Extended Backus–Naur Form) form: EmptyStmt = . or an empty string.

    For example,

    for {
    }
    
    var no
    if true {
    } else {
        no = true
    }
    
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