This patch implements <span> as it currently exists in the C++20 Working Draft.
Notes:
- __gnu_cxx::__normal_iterator is not fully constexpr, so its not used here
- P1394 might be slated to end up in C++20 per National Body Comments.
Therefore, an early implementation is left in an
implementation-defined _GLIBCXX_P1394 define.
2019-08-30 JeanHeyd "ThePhD" Meneide <phdoftheho...@gmail.com>
* include/std/span: Implement the entirety of span.
* include/bits/range_access.h: Add __adl_* versions of access functions.
* testsuite/23_containers/span/everything.cc: constexpr and
non-constexpr tests.
* include/Makefile.in: Add span to install.
* include/Makefile.am: Likewise
ThePhD.span.patch
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