diff options
Diffstat (limited to 'absl/container/flat_hash_map.h')
| -rw-r--r-- | absl/container/flat_hash_map.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/absl/container/flat_hash_map.h b/absl/container/flat_hash_map.h index fcb70d86..dbd37d3c 100644 --- a/absl/container/flat_hash_map.h +++ b/absl/container/flat_hash_map.h @@ -383,6 +383,11 @@ class flat_hash_map : public absl::container_internal::raw_hash_map< // key value and returns a node handle owning that extracted data. If the // `flat_hash_map` does not contain an element with a matching key, this // function returns an empty node handle. + // + // NOTE: when compiled in an earlier version of C++ than C++17, + // `node_type::key()` returns a const reference to the key instead of a + // mutable reference. We cannot safely return a mutable reference without + // std::launder (which is not available before C++17). using Base::extract; // flat_hash_map::merge() |