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| author | Marek Polacek <polacek@redhat.com> | 2024-01-19 15:27:51 -0500 |
|---|---|---|
| committer | Marek Polacek <polacek@redhat.com> | 2024-01-20 15:41:52 -0500 |
| commit | 7db802d972e622242d015ecd5a8cecf63e69a45a (patch) | |
| tree | fd5553d7565e8950c1586fd1464978bbd5cffe79 | |
| parent | 17473a93cff5340acfc293299a2f9a5857a50909 (diff) | |
| download | gcc-7db802d972e622242d015ecd5a8cecf63e69a45a.zip gcc-7db802d972e622242d015ecd5a8cecf63e69a45a.tar.gz gcc-7db802d972e622242d015ecd5a8cecf63e69a45a.tar.bz2 | |
libstdc++: suppress -Wdangling-reference with operator| [PR111410]
It seems to me that we should exclude std::ranges::views::__adaptor::operator|
from the -Wdangling-reference warning. It's commonly used when handling
ranges.
PR c++/111410
libstdc++-v3/ChangeLog:
* include/std/ranges: Add #pragma to disable -Wdangling-reference with
std::ranges::views::__adaptor::operator|.
gcc/testsuite/ChangeLog:
* g++.dg/warn/Wdangling-reference17.C: New test.
| -rw-r--r-- | gcc/testsuite/g++.dg/warn/Wdangling-reference17.C | 15 | ||||
| -rw-r--r-- | libstdc++-v3/include/std/ranges | 3 |
2 files changed, 18 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/warn/Wdangling-reference17.C b/gcc/testsuite/g++.dg/warn/Wdangling-reference17.C new file mode 100644 index 0000000..2236984 --- /dev/null +++ b/gcc/testsuite/g++.dg/warn/Wdangling-reference17.C @@ -0,0 +1,15 @@ +// PR c++/111410 +// { dg-do compile { target c++20 } } +// { dg-options "-Wdangling-reference" } + +#include <vector> +#include <ranges> + +int main() +{ + std::vector v{1, 2, 3, 4, 5}; + for (auto i : std::span{v} | std::views::take(1)) + { + (void) i; + } +} diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges index 7ef835f..f2413ba 100644 --- a/libstdc++-v3/include/std/ranges +++ b/libstdc++-v3/include/std/ranges @@ -942,6 +942,8 @@ namespace views::__adaptor concept __is_range_adaptor_closure = requires (_Tp __t) { __adaptor::__is_range_adaptor_closure_fn(__t, __t); }; +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Wdangling-reference" // range | adaptor is equivalent to adaptor(range). template<typename _Self, typename _Range> requires __is_range_adaptor_closure<_Self> @@ -961,6 +963,7 @@ namespace views::__adaptor return _Pipe<decay_t<_Lhs>, decay_t<_Rhs>>{std::forward<_Lhs>(__lhs), std::forward<_Rhs>(__rhs)}; } +#pragma GCC diagnostic pop // The base class of every range adaptor non-closure. // |