How do I prevent source() R code being included more than once?

StackOverflow https://stackoverflow.com/questions/8901018

  •  29-10-2019
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문제

I have lots of R source files. For example, in both A.R and C.R files, B.R is loaded via source(). Now I'd like to use the functions in both A.R and C.R, how can I avoid sourcing B.R repeatedly? Is there any include guard mechanisms similar in C/C++?

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