[Rcpp-devel] inheritance

[Dirk Eddelbuettel]

On 4 October 2011 at 17:29, Richard Downe wrote:
| I'm fairly sure I'm not doing anything at all with multiple 
| inheritance.  This is a single instance of single inheritance.

My bad, sloppy language here.  

I think I meant to say that Rcpp modules does what is in the vignette: easy
access to simple data structures, so no inheritance whatsoever at the moment.
That is of course a bit of a restriction...

| I will peruse the list; what I had seen in my searches so far had 
| suggested no conclusive answer.

Thanks. I also inadvertently dropped a 'may' in my reply.

Dirk

| --rd
| 
| On 10/04/2011 05:23 PM, Dirk Eddelbuettel wrote:
| > Richard,
| >
| > Welcome!
| >
| > On 4 October 2011 at 16:29, Richard Downe wrote:
| > | Is it possible to have a class wrapped in rcpp inherit directly from a
| > | superclass?
| > | E.g., I have
| > |
| > |      class_<tcfaIndices>( "tcfaIndices" )
| > |
| > |          .constructor<long>()
| > |
| > |          .method("SetTCFADefinition",&tcfaIndices::SetTCFADefinition)
| > |          .method("getTCFALabels",&tcfaIndices::getTCFALabels)
| > |
| > |          ;
| > |
| > | and
| > |
| > |      class_<morphologyIndices>( "morphologyIndices" )
| > |
| > |      .constructor<long>()
| > |
| > |          .method("getCentroidLumen",&morphologyIndices::getCentroidLumen)
| > |          .method("getCentroidAdventitia",
| > |&morphologyIndices::getCentroidAdventitia)
| > |
| > |          ;
| > |
| > | where the c++ class tcfaIndices inherits from c++ class morphologyIndices.
| > | I get compiler errors that suggest this is impossible (they seem to show
| > | up surrounding the cascade of calls to constructors), but was curious as
| > | to if there's a way to do this (other than, say, introducing 1 more
| > | level of abstraction, and then inserting a member variable rather than a
| > | parent class...)
| >
| > Rcpp itself is open to mulitple inheritance.
| >
| > Rcpp modules, which your question appears to be concerned with, currently
| > cannot as discussed a few times on this list.  You find perusing the list
| > archives informative.
| >
| > Hth, Dirk
| >
| 

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