Re: [Boost-users] Joining two forward ranges

13 Jan 2009


      Steven Watanabe wrote:
...
AMDG
er wrote:
...
I'm looking to create an iterator which iterates over two joined ranges:
[b0,e0)[b1,e1)
I'm sure there's a way to do it with an iterator adapter. I was 
wondering, however, if someone knew of an already available 
implementation.
Are both pairs of iterators always the same type?
In Christ,
Steven Watanabe
Good point, thanks. Here's the exact situation I have:

// mf of a class which derives from super_type
// which prepends 1 to one of the arguments before calling
// the super's (protected) mf
template
void mf(
  const R0& source,
  const R1& rest_weight
){
  typedef std::vector weight_type;
  typedef boost::range_iterator ri_type;
  typedef typename ri_type::type iter_type;
  typedef typename iterator_difference::type  diff_type;

  //TODO joined iterator preferable
  static weight_type weight(this->weight_size,(value_type)(1));
  iter_type i = boost::begin(weight);
  std::advance(i,(diff_type)(1));
  copy(
   boost::begin(rest_weight),
   boost::end(rest_weight),
   i
  );
  super_type::mf( source, weight); //args passed by const ref as well
}