boost::shared_lock - C++14 #19218

$ git grep boost::shared_lock
src/script/sigcache.cpp:        boost::shared_lock<boost::shared_mutex> lock(cs_sigcache);
src/test/cuckoocache_tests.cpp:            boost::shared_lock<boost::shared_mutex> l(mtx);

Boost 1.47 docs:

Class template shared_lock

Boost 1.70 docs:

Class template shared_lock - C++14

Does "C++14" tag mean the boost::shared_lock requires C++14? Googling, docs reading and header reviewing did not help.

Probably means it that C++14 can be used instead of boost?