metaprogramming - Implement ifLet function in R -


here code:

setgeneric("iflet",         function(sym, x, body1, body2, ...) {             standardgeneric("iflet")         })  setmethod("iflet",         signature(sym = "name", x = "any", body1 = "any", body2 = "any"),         function(sym, x, body1, body2 = {}) {             e = new.env()             sym_str = deparse(substitute(sym))             iflet(sym_str, x, body1, body2)         })  setmethod("iflet",         signature(sym = "name", x = "any", body1 = "any", body2 = "any"),         function(sym, x, body1, body2 = {}) {             stopifnot(length(sym) == 1)             e = new.env()             assign(sym, x, envir = e)             if(e[[sym]]) {                 eval(substitute(body1), e)             } else {                 eval(substitute(body2), e)             }         })  iflet("..temp..", true, {print(paste("true.", as.character(..temp..)))},          {print(paste("false.", as.character(..temp..)))}) iflet(..temp.., true, {print(paste("true.", as.character(..temp..)))},          {print(paste("false.", as.character(..temp..)))})

the "..temp.." version works fine, ..temp.. version produces error:

  error in evaluating argument 'sym' in selecting method function 'iflet': error: object '..temp..' not found

why error come out , how can solve this?


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