[Rcpp-devel] Testing for existence of named components

[Dirk Eddelbuettel]

On 29 March 2012 at 18:51, Patrick Burns wrote:
| On 29/03/2012 18:33, Dirk Eddelbuettel wrote:
| >
| > On 29 March 2012 at 19:12, Romain Francois wrote:
| > | Le 28/03/12 13:56, Ulrich Bodenhofer a écrit :
| > |>  Hi,
| > |>
| > |>  My question is the following: is there any way of checking in whether a
| > |>  component of an Rcpp list (or vector) with a given name exists in this
| > |>  list. If I simply try accessing a non-existing component, I get an
| > |>  "index out of bounds" error. Trying to catch a possible exception did
| > |>  not work either. I also browsed the Rcpp package source code, but
| > |>  unfortunately I got lost. Sorry if this has been addressed on this list
| > |>  before. At least I googled in many different ways, but could not find
| > |>  anything. Any ideas? Any help is gratefully appreciated!
| > |>
| > |>  Thanks and best regards,
| > |>  Ulrich
| > |
| > | Hello,
| > |
| > | I commited the has_element_called method on the Vector template (vectors
| > | of all sorts, incl lists).
| >
| > +1, but how about just calling it 'contains' rather 'has_element_called' ?
| 
| I think 'contains' would imply a value
| in the vector rather than a name.  The
| extra typing might be worth avoiding
| that confusion.

While that is true, it cannot deflect away from the fact that Hadley and I
are in a deadly mano-a-mano battle about the extended use, or, in my case,
strict avoidance, of underscores.  That is /extremely serious/ business.

So how about hasElementCalled() then?

Or given that these are 'names' how about

   hasElementNamed()

pr maybe

   containsName()


Dirk

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