Big Four:
Concept:解决模板
Coroutines:解决异步
Ranges:STL高级
Modules:解决头文件导入
Core Languages:
三路比较;location, consteval, constinit,
constexpr virtual function; volatile,
Library:
span, format, date, zone;
Concurrency:
atomic_ref, jthread, atomic<shared_ptr>, atomic<weak_ptr>
C++20 最新进展:加入模块化和协程,进入特性冻结阶段:https://www.oschina.net/news/104653/201902-kona-iso-c-committee-trip-report-c20?p=3
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