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I want to use for each loop because it doesn't go to NULL indices(I think) whereas in range for loop it goes through each and every index

Hussain Ahmed Siddiqui
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  • q.v. [`rbegin`](https://en.cppreference.com/w/cpp/iterator/rbegin) – Eljay Jun 13 '22 at 10:59
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    what are "NULL indices" ? You can use a loop with (reverse) iterators, there are no "NULL indices" – 463035818_is_not_an_ai Jun 13 '22 at 10:59
  • What are "null indices"? There shouldn't be any major difference between ranged-for and `std::for_each`. – HolyBlackCat Jun 13 '22 at 10:59
  • A for-each loop goes to all the same indices as a loop over the indices in reverse (`for (ssize_t i = vec.size() - 1; i >= 0; --i)`), so your premise is flawed. Iterating a `std::vector` will get the values that are `NULL` just as it gets the non-`NULL` values. – ShadowRanger Jun 13 '22 at 11:00
  • https://godbolt.org/z/o19sacME4 – Marek R Jun 13 '22 at 11:07
  • thank you for clarifying i thought that if there are 3 indices... lets say 0 1 and 2 ... if 0 and 1 are occupied by a value and 2 is empty then the iterator would skip index 2... but I was wrong :) – Hussain Ahmed Siddiqui Jun 13 '22 at 11:12
  • what do you mean with "2 is empty" ? Vectors have capacity and size. Capacity can be larger than size, but size is the number of elements, and they aren't "NULL" – 463035818_is_not_an_ai Jun 13 '22 at 11:13

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