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flag_set iterator(s) and/or for_each(flag_set<E>, [](E){}) #100

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ehoeks opened this issue May 23, 2019 · 2 comments · May be fixed by #114
Open

flag_set iterator(s) and/or for_each(flag_set<E>, [](E){}) #100

ehoeks opened this issue May 23, 2019 · 2 comments · May be fixed by #114
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@ehoeks
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ehoeks commented May 23, 2019 •
edited

As many programmers I sometimes need to do some work for all flags set in an flag_set.

Can we add an type_safe way to iterate over all 'set' flags in an flag_set?
e.g.

enum class my_enum; // some flag_set compatible enum class

void do_something_with(my_enum e);

{
  type_safe::flag_set<my_enum> some_flag_set();

  type_safe::for_each(
    some_flag_set,
    [](f){ do_something_with(f); }
  );
}
@ehoeks ehoeks changed the title flag_set iterator(s) and/or foreach(flag_set<E>, [](E){}) flag_set iterator(s) and/or for_each(flag_set<E>, [](E){}) May 23, 2019
@foonathan
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If you be willing to write something, I'm happy for a PR.

@NikolausDemmel
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In case someone works on this, I think range syntax would also be nice:

  for (auto f : some_flag_set) {
    do_something_with(f);
  }

@Neargye Neargye linked a pull request Jun 23, 2020 that will close this issue
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for_each flag_set neargye-forks/type_safe
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@NikolausDemmel @foonathan @ehoeks