basic forward iterator c++23 | Together C & C++ | Page 1

near deltaBOT Apr 16, 2025, 1:06 PM

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runic zinc Apr 16, 2025, 1:07 PM

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stl_iterator_base_funcs.h(205, 7): Error occurred here

main.cpp(23, 10): In instantiation of function template specialization 'std::advance<cvk::generator<Board::pair_depth>::iterator, int>' requested here```

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this time it 100% iterator and not range itself yamikek

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autumn rivet Apr 16, 2025, 1:11 PM

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you have using difference_t =... should be using difference_type = ...

runic zinc Apr 16, 2025, 1:12 PM

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facepalm

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skillissue

autumn rivet Apr 16, 2025, 1:12 PM

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I tend to do that often too

runic zinc Apr 16, 2025, 1:12 PM

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std::iter_difference_t

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trait

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...

autumn rivet Apr 16, 2025, 1:13 PM

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the general rule is anything at namespace level gets _t, and dependant types get _type (iter_value_t vs iterator::value_type)

runic zinc Apr 16, 2025, 1:14 PM

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it still not work hmmge

autumn rivet Apr 16, 2025, 1:14 PM

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new error or same?

runic zinc Apr 16, 2025, 1:15 PM

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same...

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[build] /usr/lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/stl_iterator_base_funcs.h:205:49: error: no type named 'difference_type' in 'std::iterator_traits<cvk::generator<Board::pair_depth>::iterator>'
[build]   205 |       typename iterator_traits<_InputIterator>::difference_type __d = __n;
[build]       |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
[build] /home/charaverk/hexchess/server/src/main.cpp:23:10: note: in instantiation of function template specialization 'std::advance<cvk::generator<Board::pair_depth>::iterator, int>' requested here
[build]    23 |     std::advance(depth,1);
[build]       |          ^
[build] 1 error generated.

both in build and clangd

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wait forward iterator require ()++

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it not satisfy regular concept

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so, compare to default sentient is OPTIONAL and not alternative to compare to self

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it still need to be able to compare itself

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actually make sense

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i just deduce to use static assert of concept by this type

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after 30 min

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can i somehow avoid it?

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i mean only if i make it output?

autumn rivet Apr 16, 2025, 1:27 PM

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You can make it an output iterator, but if you want to read it should be an input iterator

runic zinc Apr 16, 2025, 1:27 PM

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nvm i just stupid some times, it actually should be input_or_output iterator only

autumn rivet Apr 16, 2025, 1:27 PM

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input iterator only requires operator++ and comparison to sentinal type

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output iterator is similar, except operator* doesn't have to return a reference

near deltaBOT Apr 16, 2025, 2:06 PM

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@runic zinc

Please Do Not Delete Posts!

Please don't delete forum posts. They can be helpful to refer to later and other members can learn from them. In the future you can use !solved to close a post and mark a post as solved.

runic zinc Apr 16, 2025, 2:07 PM

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so it not delete entire post

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!solved

near deltaBOT Apr 16, 2025, 2:07 PM

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Thank you and let us know if you have any more questions!

This thread is now set to auto-hide after an hour of inactivity

runic zinc Apr 16, 2025, 2:08 PM

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(not solved), i cant have operator++(int) with this semantics, without it not even satisfy input iterator

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so i just decide i will use raw operation and not iterators functions for this one

autumn rivet Apr 16, 2025, 2:43 PM

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I think you just have to define operator++(int) and live with the fact that it's wrong

#basic forward iterator c++23