确保函数不使用全局变量 [英] making sure a function does not use a global variable

问题描述

这可能有点与类似的问题相反.如果在代码中的任何地方，函数使用父环境中的变量，我希望 R 中止\警告.有没有一些基本的选择来实现这一目标?我想要一个对会话通用的解决方案，而不是特定的检查.谢谢.

This maybe a bit converse to similar questions. I would like R to abort\warn if anywhere in the code, a function uses a variable in a parent environment. Is there some base option to achieve that? I would like a solution that is general for a session, not a particular check. Thank you.

推荐答案

codetools 包中有一个函数 findGlobals.也许这会有所帮助:

There is a function findGlobals in the codetools package. Maybe this is helpful:

library(codetools)
x <- "global"
foo <- function() x

foo()
[1] "global"

findGlobals(foo)
[1] "x"

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