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From: Patrick Palka <ppalka@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r10-10466] libstdc++: missing constexpr for __[nm]iter_base [PR102358] Date: Thu, 17 Feb 2022 13:04:42 +0000 (GMT) [thread overview] Message-ID: <20220217130442.ED290385AC09@sourceware.org> (raw) https://gcc.gnu.org/g:f9982b5a81a151663c76ba0a3fb6df674f29ba4b commit r10-10466-gf9982b5a81a151663c76ba0a3fb6df674f29ba4b Author: Patrick Palka <ppalka@redhat.com> Date: Thu Oct 21 12:13:35 2021 -0400 libstdc++: missing constexpr for __[nm]iter_base [PR102358] PR libstdc++/102358 libstdc++-v3/ChangeLog: * include/bits/stl_iterator.h (__niter_base): Make constexpr for C++20. (__miter_base): Likewise. * testsuite/25_algorithms/move/constexpr.cc: New test. (cherry picked from commit 5f7976f65b45c457b57bfc2c55ec845771e0d3c2) Diff: --- libstdc++-v3/include/bits/stl_iterator.h | 2 ++ .../testsuite/25_algorithms/move/constexpr.cc | 19 +++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/libstdc++-v3/include/bits/stl_iterator.h b/libstdc++-v3/include/bits/stl_iterator.h index 8857813e691..85e58973ac6 100644 --- a/libstdc++-v3/include/bits/stl_iterator.h +++ b/libstdc++-v3/include/bits/stl_iterator.h @@ -2276,6 +2276,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION /// @} group iterators template<typename _Iterator> + _GLIBCXX20_CONSTEXPR auto __niter_base(move_iterator<_Iterator> __it) -> decltype(make_move_iterator(__niter_base(__it.base()))) @@ -2289,6 +2290,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION }; template<typename _Iterator> + _GLIBCXX20_CONSTEXPR auto __miter_base(move_iterator<_Iterator> __it) -> decltype(__miter_base(__it.base())) diff --git a/libstdc++-v3/testsuite/25_algorithms/move/constexpr.cc b/libstdc++-v3/testsuite/25_algorithms/move/constexpr.cc new file mode 100644 index 00000000000..773c55cfb50 --- /dev/null +++ b/libstdc++-v3/testsuite/25_algorithms/move/constexpr.cc @@ -0,0 +1,19 @@ +// { dg-options "-std=gnu++20" } +// { dg-do compile { target c++20 } } + +#include <algorithm> +#include <span> + +constexpr bool +test01() +{ + // PR libstdc++/102358 + int x[2] = {1,2}, y[2]; + std::span in(x), out(y); + std::move(std::move_iterator(in.begin()), std::move_iterator(in.end()), + out.begin()); + return std::equal(std::move_iterator(in.begin()), std::move_iterator(in.end()), + std::move_iterator(out.begin())); +} + +static_assert(test01());
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