On 15-Dec-2020, the C++ language standard got it’s 6th edition – what we fondly call as C++20.The new standard revises the previous C++17 standard.
Buy the new C++20, available as a pdf in English at CHF 198, at https://www.iso.org/standard/79358.html.
Preview C++20 at https://www.iso.org/obp/ui/#iso:std:79358:en.
The latest draft is available at https://wg21.link/std free of cost.
Previously, on 04-Sep-20, the DIS (Draft International Standard) had ended and it passed unanimously. C++20 had received it final technical approval after which the final round of editorial work was going on which culminated into the publication of the C++20 standard.
Previous C++17 standard is available at https://www.iso.org/standard/68564.html.
The C++ language updates it’s standards every 3 years. It is remarkable that C++20 was rolled out without any delay! Kudos to the ISO C++ Standard Committee and to the entire C++ community.
Ankur Satle 
Any summary reference where we can see what all got incorporated in new standard.
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Good question! I will jump to mention the BIG ones that potentially change how we do things in a big way:
1. Modules
2. Ranges
3. Concept
4. Coroutines
There are many other smaller which improve with a lot of important things:
a. jthread
b. std::span
c. Spaceship comparison operator
d. Concurrency related
e. Templated lambdas
f. constinit, consteval
g. std::format
And, many more!
During cppcon 2020 Fireside chat with Bjarne Stroustrup, Herb Sutter, JF Bastein, Tony Van Eerd, Hana Dusikova, etc. everyone noted that C++20 is so big that it will take people 2 years or so to see the impact, or have newer practices/guidelines emerge, etc.
I cannot do a good job noting things here. I will refer you to the following instead:
C++20: An (Almost) Complete Overview – Marc Gregoire – CppCon 2020: https://youtu.be/FRkJCvHWdwQ
How C++20 Changes the Way We Write Code – Timur Doumler – CppCon 2020: https://youtu.be/ImLFlLjSveM
Thanks,
Ankur Satle
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