warning: 'unique' is deprecated

[yurivict]

/usr/ports/misc/xgboost/work/xgboost-2.1.0/src/c_api/coll_c_api.cc:174:22: warning: 'unique' is deprecated [-Wdeprecated-declarations]
  174 |   while (!ptr->first.unique()) {
      |                      ^
/usr/include/c++/v1/__memory/shared_ptr.h:730:3: note: 'unique' has been explicitly marked deprecated here
  730 |   _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_HIDE_FROM_ABI bool unique() const _NOEXCEPT { return use_count() == 1; }
      |   ^
/usr/include/c++/v1/__config:1004:41: note: expanded from macro '_LIBCPP_DEPRECATED_IN_CXX17'
 1004 | #    define _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_DEPRECATED
      |                                         ^
/usr/include/c++/v1/__config:977:49: note: expanded from macro '_LIBCPP_DEPRECATED'
  977 | #      define _LIBCPP_DEPRECATED __attribute__((__deprecated__))
      |                                                 ^
1 warning generated.