Function Input Iterator

[anonymous]

Simply put a the function input iterator implementation wraps a nullary function object and allows for bounded iterators using an embedded state variable. The use case is for something like the following:

struct generator {
 typedef int result_type;
 generator() { srand(time(0)); }
 result_type operator() () const { return rand(); }
};

using namespace std;
using namespace boost;

int main(int argc, char * argv[]) {
 generator f;
 copy(
   make_function_input_iterator(f, infinite()),
   make_function_input_iterator(f, infinite()),
   ostream_iterator<int>(cout, " ")
   );
 return 0;
}

And if you don't want an infinite range, you can simply bound it:

copy(
  make_function_input_iterator(f, 0),
  make_function_input_iterator(f, 10),
  ostream_iterator<int>(cout, " ")
);

[anonymous]

Implementation header.

[Dean Michael Berris]

Function iterator documentation (HTML)

[Dean Michael Berris]

Documentation source (RST)

[Dean Michael Berris]

Was submitting the ticket anonymously earlier (unintentionally). Adding a comment as me (Dean Michael Berris) for proper documentation.

[Jeremiah Willcock]

(In [62615]) Added function_input_iterator from Dean Michael Berris; fixes #2893

[Marshall Clow]

(In [67792]) Merging fixes to release; fixes #2294 fixes #4918 fixes #3645 refs #2823 refs #1427 refs #2893

[mimomorin@…]

Reopened until merged into release. ([67792] didn't add function_input_iterator to release.)

[Daniel James]

(In [70709]) Iterator: merge several changes from trunk.

• Update iterator_facade test for #1019 (header change already merged).
• Category of each iterator is reduced to a known category before we try to find a minimum. Fixes #1517.
• function_input_iterator from Dean Michael Berris. Fixes #2893
• Fix typo in boost/iterator.hpp. Fixes #3434.
• Always include add_reference header in iterator adaptor header.

Did not merge changes for #1427.