Meeting 21 September 2017

CppCon 2016: Richard Smith “There and Back Again: An Incremental C++ Modules Design”

• Clang’s “C++98 Modules”; GDR in the audience (RS: “Do you like it?” GDR: “I don’t know!”)
• Modules TS
• Why Google needs macros in modules (#export_macros)
  • To support incremental transition (import legacy foo.h)
  • P0273R1: Proposed modules changes from implementation and deployment experience

C++Now 2017 keynote: Ali Cehreli - Competitive Advantage with D

• Unified call syntax:

1auto minutes(int n) { ... }
2minutes(10);
310.minutes;
4
5writeln(evens(divide(multiply(values, 10), 3)));
6values.multiply(10).divide(3).evens.writeln;

Accelerating your C++ on GPU with SYCL

• Post by Simon Brand (@TartanLlama)
• Code samples
• Intro to GPGPU computing
• Libraries: triSYCL and ComputeCpp
• SyclParallelSTL implements Parallelism TS

Transferring data from main memory to the GPU is slow. Really slow. Like, kill all your performance and get you fired slow.

VXL: Computer vision library

• Home
• FAQ

C++ Map

• Original
• Local copy

Polymorphic clones in modern C++

Jonathan Boccara

• “virtual constructors” returning covariant bare pointers
• “virtual constructors” returning unique_ptr<Interface>
• multiple inheritance: use different “constructor” names

Quentin Duval, Reddit

• provide a free function clone to wrap the returned pointers in unique_ptr
• Non-Virtual Interface + CRTP
• additionally, return pointers using GSL’s owner

CopperSpice YouTube C++ Channel

YouTube

std::visit is everything wrong with modern C++

Post

• union, std::variant
• Open Pattern Matching for C++, by Yuriy Solodkyy, Gabriel Dos Reis, Bjarne Stroustrup (PDF)
  • Mach7 on GitHub
• P0095R1: Pattern Matching and Language Variants, by David Sankel :: Article

Optional: command-line argument parsing library

Home

• The library name is very confusing

Just::thread Pro Library v2.5.0

• Written by Anthony Williams
• Home
• Pricing
• Now includes coroutines!

Thoughts on destructive move

Post

• Move operations are allowed to throw
  • std::move_if_noexcept
• Move operations are potentially expensive
• Moved-from state

Quotes

The Release Uncertainty Principle says you can accurately know what the software will do, or when you will get it, but not both.

– @sanityinc

Programmer’s motto:

“We’ll cross that bridge when it’s burning underneath us.”

– @garybernhardt