Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
This is an older version of Boost and was released in 2017. The current version is 1.89.0.
boost::icl::identity_element<boost::gregorian::date_duration>
// In header: <boost/icl/gregorian.hpp> struct identity_element<boost::gregorian::date_duration> { // public static functions static boost::gregorian::date_duration value(); };