 Advantages  Replace header files  Modules explicitly state what should be exported (e.g. classes, functions, …)  Separation into module interface files and module implementation files is possible support coroutines  Standard Library does not yet include helper classes such as generators  Visual C++ includes experimental helper classes, for example:  std::experimental::generator18 Coroutines

FlexClass Classes with dynamic size for everyone “C++ Flexible Array Members” Breno Guimarães brenorg@gmail.com Twitter @brenorg https://github.com/brenoguim/flexclassstd::make_shared(n) s

Time Points  Dates  Time Zones29 Dates  Since C++20  Gregorian calendar support  Several classes to represent dates or part of dates:  year, month, day  weekday, weekday_indexed, weekday_last

identifies a property and value is the corresponding value of this property Properties Types (or classes) of vertices and edges Labels 查询语言：基于 Cypher 贴合 ISO GQL Standard • Incorporate by reference specifications

f(this Data&); void g(this const Data&); void h(this Data&&);9 Explicit Object Parameters  Classes often have const and non-const overloads of members, possibly ref-qualified  E.g.: class Person