57. Toad Notes Go language--closures

This is a creation in Article, where the information may have evolved or changed.

57. Toad Notes Go language--closures

Closures are entities that are composed of functions and their associated reference environments (that is, closures = functions + reference environments).

The sample code is as follows:

Package Main

Import "FMT"

func Exfunc (nint)func() {

sum:=n

a:=func() {// assigns the anonymous function as a value to variable a(Go does not allow function nesting.)

// However you can use anonymous functions to implement nested functions)

FMT. Println (sum+1)// call a variable outside this function

}// There is no () anonymous function is not executed immediately

returna

}

func Main () {

myfunc:=exfunc (ten)

myFunc ()

myanotherfunc:=exfunc ()

myanotherfunc ()

myFunc ()

myanotherfunc ()

}

Execution results are as follows

11

21st

11

21st

Conditions in which the closure function appears:

1. The nested function refers to an external variable that is not the function, and the external variable is not a "global variable"

2. The nested function is isolated (returned by the parent function or assigned to a separate individual).

The parent function where the referenced variable resides has ended.

Objects are data that is attached to the behavior, and closures are data-attached behaviors.

Friendship Link

Http://www.cnblogs.com/Jifangliang/archive/2008/08/05/1260602.html

Http://blog.sina.com.cn/s/blog_487109d101018fcx.html