Declared in <absl/container/btree_map.h>
<absl/container/btree_map.h>
template< class K = key_type, int = (EnableIf<LifetimeBoundK<K, false, IfRRef<int &&>::AddPtr<K>>>()), class... Args> decltype(auto) try_emplace( key_arg<K>&& k, Args&&... args);