如何在lua 5.2中检索变量参数 [英] how to retrieve variable arguments in lua 5.2

问题描述

参考页都说类似

function this(...)
end

但是，当我尝试应用假定的arg变量时，我得到的只是一个零引用.我为捕获参数所做的任何尝试都会在nil表中产生结果.我尝试强制使用local tab = {...}，但仍然获得nil参考.我设法捕获参数的最接近的是select("#",...)，它仅返回参数的数量.每当我尝试捕获此外部参数声明时，我都只会遇到另一个错误...

However when I try to apply the supposed arg variable all I get is a nil reference. Any attempt I've made to capture the arguments results in a nil table. I've tried forcing a local tab = {...} and still get the nil reference. The closest I've managed to get to capturing the arguments is a select("#",...) which only returns the number of arguments. Whenever I try to capture this outside parameter declaration I get nothing but another error...

我一直在无济于事地调查着……我能在不强制通过表的情况下完成此工作吗?

I've been thoroughly looking into this with no avail... any way I can accomplish this without forcibly passing a table?

推荐答案

arg参数仅适用于Lua 5.0.从Lua 5.1开始，改为使用vararg表达式....

The arg argument is for Lua 5.0 only. Since Lua 5.1, the vararg expression ... is used instead.

尝试一下:

function foo(...)
    for k, v in ipairs{...} do
        print(k, v)
    end
end

foo('hello', 'world')

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