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stable_partition on forward iterators


By : Marepal
Date : September 16 2020, 11:00 AM
I hope this helps . First of all, no support has been dropped, std::stable_partition has always required BidirectionalIterator by the standard. Which does not mean that the implementors of the library are disallowed to give less restrictions on input arguments (if it continues to comply with other parts of the standard ofc). And so Gcc, Clang and Intel use their rights and made the code even more generic. You can think of it as a compiler extension of standard library.
Having said that one may ask why standard requires BidirectionalIterator here. I suppose it is possible because the authors of the standard didn't see a way to comply with the complexity requirements without this requirement. It is possible that the authors of gcc found a way to do it better than anticipated by the standard. Looking at the gcc source code kinda confirms this. https://github.com/gcc-mirror/gcc/blob/master/libstdc%2B%2B-v3/include/bits/stl_algo.h#L1613
code :


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Can input iterators be used where forward iterators are expected?


By : user3219170
Date : March 29 2020, 07:55 AM
Does that help
Can input iterators be used where forward iterators are expected?

What's the difference between input iterators and read-only forward iterators?


By : diego ronaldo
Date : March 29 2020, 07:55 AM
this will help Yes, input iterators are one-pass iterators. You can only iterate over them once, while forward iterators are multi-pass.
From §24.2.3 [input.iterators] p2 (the table), pre-/postcondition column of ++r:

Are c++ forward/bidi/random iterators always output iterators?


By : jonlee
Date : March 29 2020, 07:55 AM
I hope this helps you . I see many texts on the STL (e.g. http://www.cplusplus.com/reference/std/iterator/) that imply that Forward iterators (and by extension Bidi and Random iterators) must satisfy both Input and Output iterator requirements. This seems odd to me, since const iterators are clearly iterators, but are just as clearly not Output iterators. , C++03 says (24.1/4):

Are Forward-Iterators Output-Iterators?


By : deqhi
Date : March 29 2020, 07:55 AM
like below fixes the issue In C++11, no, forward iterators are not required to be output iterators. The output iterator requirements are like an extra set of requirements that an iterator can have, regardless of the rest of the iterator requirements it meets. Forward iterators are only required to be input iterators (§24.2.5/1):
code :
namespace std {
  struct input_iterator_tag { };
  struct output_iterator_tag { };
  struct forward_iterator_tag: public input_iterator_tag { };
  struct bidirectional_iterator_tag: public forward_iterator_tag { };
  struct random_access_iterator_tag: public bidirectional_iterator_tag { };
}

Forward and current iterators


By : wumingyu
Date : March 29 2020, 07:55 AM
To fix the issue you can do I am not certain of what is the exact question but the code itself could be rewritten using the windows iterator:
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