Lua:如何避免循环要求 [英] Lua: How to avoid Circular Requires

问题描述

在尝试执行循环要求时，如何避免Lua 5.1出现以下错误?

How can I avoid the following error from Lua 5.1 when attempting to do a circular require?

$ lua main.lua 
lua: ./bar.lua:1: loop or previous error loading module 'foo'
stack traceback:
    [C]: in function 'require'
    ./bar.lua:1: in main chunk
    [C]: in function 'require'
    ./foo.lua:1: in main chunk
    [C]: in function 'require'
    main.lua:1: in main chunk
    [C]: ?

文件结构

main.lua

require "foo"
require "bar"
print (Foo.getName())
print (Bar.getName())

foo.lua

require 'bar'
Foo = {}
Foo.name = 'foo'

function Foo:getName()
    return Foo.name .. Bar.name
end

bar.lua

require 'foo'
Bar = {}
Bar.name = 'bar'

function Bar:getName()
    return Bar.name .. Foo.name
end

预期产量

$ lua main.lua 
foobar
barfoo

推荐答案

解决此问题的另一种方法是更改​​代码的结构，并将相互"功能提取到第三个模块中，这两个模块均Foo和Bar会要求.

Another way would to solve this issue would be to change the structure of the code and extract the "mutual" functionality into a third module, which both Foo and Bar would require.

这篇关于Lua:如何避免循环要求的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！