modern-cpp-features VS abseil-cpp

Just go through this https://github.com/AnthonyCalandra/modern-cpp-features and you should be fine.

If you also like thorough explanations and graphs, there's https://hackingcpp.com/ that could answer many questions you might have.

By the way, just in case, bookmark this online C++ reference https://eel.is/c++draft/ for diving in deep waters.

Good luck!

I'm a little 10 years out from writing C++ professionally and I found this cheat sheet[0] useful. Basically if you have an inkling of the concept you're looking for, just search on that cheat sheet to find the relevant new C++ thing. Specifically for me, we used Boost for smart pointers which are now part of the stdlib, and threads are now part of the stdlib as well.

[0] https://github.com/AnthonyCalandra/modern-cpp-features

A more productive way to go about it would be to ask "What are the features in each version of C++ past C++11 that I should care about the most?" instead. In that case you could take a look at things like https://github.com/AnthonyCalandra/modern-cpp-features and https://github.com/mortennobel/cpp-cheatsheet, see what appeals to you, ignore what does not.

Looks like there's a version history here

As someone suggested cppcon and c++ talks, also I would reccomend reading this: https://github.com/AnthonyCalandra/modern-cpp-features and all things in the papers section in this: https://en.cppreference.com/w/cpp/compiler_support

I've already done a bit of research which has led me to the The Definitive C++ Book Guide & List. From that, I've decided to go over The C++ Programming Language (4th Edition) to learn C++11 and then this GitHub repo to learn the remaining C++14/17/20 features.

clickable:

"Welcome back to C++ - Modern C++" https://learn.microsoft.com/en-us/cpp/cpp/welcome-back-to-cp...

"21 New Features of Modern C++ to Use in Your Project" http://www.vishalchovatiya.com/21-new-features-of-modern-cpp...

"What is modern C++"? https://www.reddit.com/r/cpp_questions/comments/tgs6ir/what_...

"C++ is the next C++" https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p26...

"modern c++ features" https://github.com/AnthonyCalandra/modern-cpp-features

C++ 23 to introduce module support "https://www.infoworld.com/article/3662808/c-plus-plus-23-to-..."

"C++ 2023" https://en.wikipedia.org/wiki/C%2B%2B23

Yeah, it's nice! And Abseil does it, IFF you use LLVM libc++.

https://github.com/abseil/abseil-cpp/blob/master/absl/string...

The standard adopted it as resize_and_overwrite. Which I think is a little clunky.

This may be confusing to those familiar with Google's libraries. The baseline is the Go BTree, which I personally never heard of until just now, not the C++ absl::btree_set. The benchmarks aren't directly comparable, but the C++ version also comes with good microbenchmark coverage.

https://github.com/google/btree

https://github.com/abseil/abseil-cpp/blob/master/absl/contai...

An implementation of call_once that accommodates callbacks that throw: https://github.com/abseil/abseil-cpp/blob/master/absl/base/c...

I wouldn't say it's that cryptic. It's just a few bitwise rotations/shifts/xor operations.

You can see hashing optimizations as well https://www.deepmind.com/blog/alphadev-discovers-faster-sort..., https://github.com/abseil/abseil-cpp/commit/74eee2aff683cc7d...

I was one of the members who reviewed expertly what has been done both in sorting and hashing. Overall it's more about assembly, finding missed compiler optimizations and balancing between correctness and distribution (in hashing in particular).

It was not revolutionary in a sense it hasn't found completely new approaches but converged to something incomprehensible for humans but relatively good for performance which proves the point that optimal programs are very inhuman.

Note that for instructions in sorting, removing them does not always lead to better performance, for example, instructions can run in parallel and the effect can be less profound. Benchmarks can lie and compiler could do something differently when recompiling the sort3 function which was changed. There was some evidence that the effect can come from the other side.

For hashing it was even funnier, very small strings up to 64 bit already used 3 instructions like add some constant -> multiply 64x64 -> xor upper/lower. For bigger ones the question becomes more complicated, that's why 9-16 was a better spot and it simplified from 2 multiplications to just one and a rotation. Distribution on real workloads was good, it almost passed smhasher and we decided it was good enough to try out in prod. We did not rollback as you can see from abseil :)

But even given all that, it was fascinating to watch how this system was searching and was able to find particular programs can be further simplified. Kudos to everyone involved, it's a great incremental change that can bring more results in the future.

Check out https://abseil.io. It offers absl::optional, which is a backport of std::optional.