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Author SHA1 Message Date
Arthur O'Dwyer fa6b9e4010 [libc++] Normalize all our '#pragma GCC system_header', and regression-test. 
Now we'll notice if a header forgets to include this magic phrase.

Differential Revision: https://reviews.llvm.org/D118800
 2022-02-04 12:27:19 -05:00
Arthur O'Dwyer 38db42d004 [libc++] [NFC] s/_LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS)/!defined(_LIBCPP_HAS_NO_CONCEPTS)/ 
Per Discord discussion, we're normalizing on a simple `!defined(_LIBCPP_HAS_NO_CONCEPTS)`
so that we can do a big search-and-replace for `!defined(_LIBCPP_HAS_NO_CONCEPTS)`
back into `_LIBCPP_STD_VER > 17` when we're ready to abandon support for concept-syntax-less
compilers.

Differential Revision: https://reviews.llvm.org/D118748
 2022-02-02 11:02:56 -05:00
Arthur O'Dwyer c965d5448e [libc++] [ranges] Implement std::ranges::distance 
This includes an experimental workaround for
LWG3664 "LWG3392 broke std::ranges::distance(a, a+3)",
but the workaround may be incomplete, I'm not sure.
This should be re-audited when LWG3664 is actually adopted,
to see if we need to change anything about our implementation.

See also https://github.com/microsoft/STL/pull/2500

Differential Revision: https://reviews.llvm.org/D117940
 2022-01-31 12:23:10 -05:00
Louis Dionne 64184b4af0 [libc++][NFC] Remove useless _LIBCPP_PUSH_MACROS 
Only files that actually use min/max are required to do this dance.

Differential Revision: https://reviews.llvm.org/D108778
 2021-08-27 12:41:55 -04:00
Christopher Di Bella 8517a26d44 [libcxx][modularisation] splices `<iterator>` into individual headers 
Differential Revision: https://reviews.llvm.org/D105076
 2021-07-06 17:59:21 +00:00