[R] namespace? environment? how to manage functions?

[whizvast]

Hi, useRs-

I have been building a set of functions over time and now my R_GlobalEnv
becomes
too crowded. 

I would like to put all my functions under the same namespace/environment.
Ideally, 
I would like to call them using "env::func" as in C++. 

The following code almost do the jobs I want - except that I need to add
"env$" 
before defining each function. I can't do that because my functions are
saved in 
different files. 

Anybody has any suggestion? Thx~


## test code ##
abc <- new.env()
abc$tmpf <- function() print('hello, world!')
attach(abc)

abc$tmpf()
tmpf()


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