[Rcpp-devel] Vector<>::create

[Romain Francois]

Hello,

I've commited Vector<>::create methods to support creation of any kind 
of vectors with named or unnamed objects. examples:

// creating an unamed integer vector
IntegerVector::create( 10, 20 ) ;

// creating a named character vector
CharacterVector::create( _["foo"] = "bar", _["bar"] = "foo" ) ;

// creating a named list
List::create( _["foo"] = 10, _["bar"] = true ) ;

The syntax :

_[.] = .

can be replaced by this for people who don't like _ :

Argument( . ) = .

so for example :

List::create( Argument("foo") = 10, Argument("bar") = true ) ;




I could not use Named as it is now because it wraps the object too early 
and so would only work for lists (which contains SEXP) and would not 
work for e.g. integer vectors.

Here the rhs of Argument::operator= is kept as a reference until it is 
effectively stored in the object, so Argument::operator= makes an object 
of the template class traits::named_object which create knows how to 
deal with, but the key is that named_object does not wrap but only 
contains reference.


The new question is : should "Argument" be called something else ? 
Should I rework all others clients of Named so that they use Argument 
instead (in that case I would then call it Named).

Romain

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Romain Francois
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