Jonathan Wakely 240b01b021 libstdc++: Add [[nodiscard]] to iterators and related utilities ... This adds [[nodiscard]] throughout <iterator>, as proposed by P2377R0 (with some minor corrections). The attribute is added for all modes from C++11 up, using [[__nodiscard__]] or _GLIBCXX_NODISCARD where C++17 [[nodiscard]] can't be used directly. Signed-off-by: Jonathan Wakely <jwakely@redhat.com> libstdc++-v3/ChangeLog: * include/bits/iterator_concepts.h (iter_move): Add [[nodiscard]]. * include/bits/range_access.h (begin, end, cbegin, cend) (rbegin, rend, crbegin, crend, size, data, ssize): Likewise. * include/bits/ranges_base.h (ranges::begin, ranges::end) (ranges::cbegin, ranges::cend, ranges::rbegin, ranges::rend) (ranges::crbegin, ranges::crend, ranges::size, ranges::ssize) (ranges::empty, ranges::data, ranges::cdata): Likewise. * include/bits/stl_iterator.h (reverse_iterator, __normal_iterator) (back_insert_iterator, front_insert_iterator, insert_iterator) (move_iterator, move_sentinel, common_iterator) (counted_iterator): Likewise. * include/bits/stl_iterator_base_funcs.h (distance, next, prev): Likewise. * include/bits/stream_iterator.h (istream_iterator) (ostream_iterartor): Likewise. * include/bits/streambuf_iterator.h (istreambuf_iterator) (ostreambuf_iterator): Likewise. * include/std/ranges (views::single, views::iota, views::all) (views::filter, views::transform, views::take, views::take_while) (views::drop, views::drop_while, views::join, views::lazy_split) (views::split, views::counted, views::common, views::reverse) (views::elements): Likewise. * testsuite/20_util/rel_ops.cc: Use -Wno-unused-result. * testsuite/24_iterators/move_iterator/greedy_ops.cc: Likewise. * testsuite/24_iterators/normal_iterator/greedy_ops.cc: Likewise. * testsuite/24_iterators/reverse_iterator/2.cc: Likewise. * testsuite/24_iterators/reverse_iterator/greedy_ops.cc: Likewise. * testsuite/21_strings/basic_string/range_access/char/1.cc: Cast result to void. * testsuite/21_strings/basic_string/range_access/wchar_t/1.cc: Likewise. * testsuite/21_strings/basic_string_view/range_access/char/1.cc: Likewise. * testsuite/21_strings/basic_string_view/range_access/wchar_t/1.cc: Likewise. * testsuite/23_containers/array/range_access.cc: Likewise. * testsuite/23_containers/deque/range_access.cc: Likewise. * testsuite/23_containers/forward_list/range_access.cc: Likewise. * testsuite/23_containers/list/range_access.cc: Likewise. * testsuite/23_containers/map/range_access.cc: Likewise. * testsuite/23_containers/multimap/range_access.cc: Likewise. * testsuite/23_containers/multiset/range_access.cc: Likewise. * testsuite/23_containers/set/range_access.cc: Likewise. * testsuite/23_containers/unordered_map/range_access.cc: Likewise. * testsuite/23_containers/unordered_multimap/range_access.cc: Likewise. * testsuite/23_containers/unordered_multiset/range_access.cc: Likewise. * testsuite/23_containers/unordered_set/range_access.cc: Likewise. * testsuite/23_containers/vector/range_access.cc: Likewise. * testsuite/24_iterators/customization_points/iter_move.cc: Likewise. * testsuite/24_iterators/istream_iterator/sentinel.cc: Likewise. * testsuite/24_iterators/istreambuf_iterator/sentinel.cc: Likewise. * testsuite/24_iterators/move_iterator/dr2061.cc: Likewise. * testsuite/24_iterators/operations/prev_neg.cc: Likewise. * testsuite/24_iterators/ostreambuf_iterator/2.cc: Likewise. * testsuite/24_iterators/range_access/range_access.cc: Likewise. * testsuite/24_iterators/range_operations/100768.cc: Likewise. * testsuite/26_numerics/valarray/range_access2.cc: Likewise. * testsuite/28_regex/range_access.cc: Likewise. * testsuite/experimental/string_view/range_access/char/1.cc: Likewise. * testsuite/experimental/string_view/range_access/wchar_t/1.cc: Likewise. * testsuite/ext/vstring/range_access.cc: Likewise. * testsuite/std/ranges/adaptors/take.cc: Likewise. * testsuite/std/ranges/p2259.cc: Likewise.		2021-08-04 12:54:28 +01:00
..
array	libstdc++: Add [[nodiscard]] to iterators and related utilities	2021-08-04 12:54:28 +01:00
bitset	Update copyright years.	2021-01-04 10:26:59 +01:00
deque	libstdc++: Add [[nodiscard]] to iterators and related utilities	2021-08-04 12:54:28 +01:00
forward_list	libstdc++: Add [[nodiscard]] to iterators and related utilities	2021-08-04 12:54:28 +01:00
headers	Update copyright years.	2021-01-04 10:26:59 +01:00
list	libstdc++: Add [[nodiscard]] to iterators and related utilities	2021-08-04 12:54:28 +01:00
map	libstdc++: Add [[nodiscard]] to iterators and related utilities	2021-08-04 12:54:28 +01:00
multimap	libstdc++: Add [[nodiscard]] to iterators and related utilities	2021-08-04 12:54:28 +01:00
multiset	libstdc++: Add [[nodiscard]] to iterators and related utilities	2021-08-04 12:54:28 +01:00
priority_queue	libstdc++: Remove redundant -std=gnu++17 option from containers tests	2021-05-10 16:22:53 +01:00
queue	libstdc++: Remove redundant -std=gnu++17 option from containers tests	2021-05-10 16:22:53 +01:00
set	libstdc++: Add [[nodiscard]] to iterators and related utilities	2021-08-04 12:54:28 +01:00
span	libstdc++: Constrain std::as_writable_bytes [PR101411]	2021-07-12 18:35:27 +01:00
stack	libstdc++: Remove redundant -std=gnu++17 option from containers tests	2021-05-10 16:22:53 +01:00
unordered_map	libstdc++: Add [[nodiscard]] to iterators and related utilities	2021-08-04 12:54:28 +01:00
unordered_multimap	libstdc++: Add [[nodiscard]] to iterators and related utilities	2021-08-04 12:54:28 +01:00
unordered_multiset	libstdc++: Add [[nodiscard]] to iterators and related utilities	2021-08-04 12:54:28 +01:00
unordered_set	libstdc++: Add [[nodiscard]] to iterators and related utilities	2021-08-04 12:54:28 +01:00
vector	libstdc++: Add [[nodiscard]] to iterators and related utilities	2021-08-04 12:54:28 +01:00