CGAL::Dispatch_or_drop_output_iterator< V, O > Class Template Reference

#include <CGAL/iterator.h>

Inherits from

O.

Definition

template<typename V, typename O>
class CGAL::Dispatch_or_drop_output_iterator< V, O >

The class Dispatch_or_drop_output_iterator defines an OutputIterator that contains a tuple of output iterators, and dispatches among those based on the type of the value type which is put in it.

Besides defining assignment for all parameters of V and for a tuple of type V, it is also defined for the types std::variant<T...> and std::optional<std::variant<T...> >, where T... must be a subset of the parameters of V. Should the std::optional be empty, it will be discarded.

Parameters

Template Parameters

V	must be a std::tuple<...> of the types of values to be accepted and dispatched.
O	must be a std::tuple<...> of the types of corresponding output iterators.

Is model of

OutputIterator

File STL_Extension/Dispatch_output_iterator.cpp

#include <vector>
#include <CGAL/iterator.h>
#include <variant>
#include <optional>
 
int main()
{
  std::vector<int> a;
  std::vector<double> b;
  std::vector<char> c;
 
  typedef CGAL::Dispatch_output_iterator<
    std::tuple<int, double, char>,
    std::tuple<std::back_insert_iterator< std::vector<int> >,
               std::back_insert_iterator< std::vector<double> >,
               std::back_insert_iterator< std::vector<char> >
               > > Dispatch;
 
  Dispatch disp = CGAL::dispatch_output<int, double, char>(
    std::back_inserter(a),
    std::back_inserter(b),
    std::back_inserter(c));
 
  typedef std::variant<int, double, char> var;
  var va = 23; var vb = 4.2; var vc = 'x';
 
  // goes to a
  *disp++ = va;
  // goes to b
  *disp++ = vb;
  // goes to c
  *disp++ = vc;
  // goes to a
  *disp++ = 42;
 
  return 0;
}

See also

CGAL::Dispatch_output_iterator<V,O>

Related Functions
(Note that these are not member functions.)
template<typename... V, typename... O>
Dispatch_or_drop_output_iterator< tuple< V... >, tuple< O... > >	dispatch_or_drop_output (O... o)

Types
typedef V	Value_type_tuple
typedef O	Iterator_tuple

Creation
	Dispatch_or_drop_output_iterator (I...o)
	Constructor taking all the output iterators.
const Iterator_tuple &	get_iterator_tuple () const
	returns a reference to the tuple of output iterators.

Friends And Related Function Documentation

dispatch_or_drop_output()

template<typename... V, typename... O>

Dispatch_or_drop_output_iterator< tuple< V... >, tuple< O... > > dispatch_or_drop_output ( O...  o )

related

Returns

a Dispatch_or_drop_output_iterator constructed from the arguments.