Recursive Search

How would one search a C++ linked list with a recursive function?

why would you want to?

i have to for an assignment

i have no idea why you would want to

my c++ is a bit rusty, but I think somthing like this:


// setup linked list
GOTO SEARCH;

SEARCH-NEXT:
THIS = THIS.NEXT

SEARCH: IF(THIS.VALUE == SEARCHINGFOR.VALUE) {
   THEN DONE; STOP;
ELSE
   GOTO SEARCH-NEXT
}

lolwut? Enjoy your call stack overflows.

#include <list>

int searchList(std::list<int> inList, int searchThing) {
  int result;
  std::list<int>::iterator iter = inList.begin();
  if (iter == inList.end()) {
    result = 9001;
  } else if ((*iter) == searchThing) {
    result = (*iter);
  } else {
    ++iter;
    result = searchList(std::list<int>(iter, inList.end()), searchThing);
  }
  return result;
}

>>6
>} else {
>++iter;

i like how must people use ++inet because they think compilers don't optimize their code.

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    (Post truncated.)

elem _ [] = False
elem x (y:ys) = x == y || elem x ys

[...].index(element)

>>7

It has more to do with building a habit for those (admittedly rare) times that you ++ something that isn't a POD where the construction of a temporary might have side-effects which result in the compiler not being able to optimize it.

It really doesn't much matter either way.  It's just a style choice.

>>3

Tell your teacher that they're an idiot.  There are plenty of valuable uses for recursion.  Calculating fibonacci numbers and searching linear data structures do not fall into that set.

>>6
enjoy your tail recursion

Lain.

16 Name: Anonymous 2010-12-17 1:24

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