diff options
Diffstat (limited to 'absl/container/btree_map.h')
| -rw-r--r-- | absl/container/btree_map.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/absl/container/btree_map.h b/absl/container/btree_map.h index bb450ead..448ac48a 100644 --- a/absl/container/btree_map.h +++ b/absl/container/btree_map.h @@ -325,6 +325,11 @@ class btree_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). + // // NOTE: In this context, `node_type` refers to the C++17 concept of a // move-only type that owns and provides access to the elements in associative // containers (https://en.cppreference.com/w/cpp/container/node_handle). @@ -652,6 +657,11 @@ class btree_multimap // 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). + // // NOTE: In this context, `node_type` refers to the C++17 concept of a // move-only type that owns and provides access to the elements in associative // containers (https://en.cppreference.com/w/cpp/container/node_handle). |