April 30, Online
May 7-12, Aspen, CO, USA
June 24-29, St. Louis, MO, USA
July 2-5, Folkestone, Kent, UK
By Adrien Hamelin | Jun 22, 2018 11:41 AM | Tags: experimental
Useful to keep an eye on the evolution.
C++20 features described in Before/After tables ("Tony Tables")
by Tony Van Eerd
From the article:
C++20 features described in Before/After tables ("Tony Tables")
This is an attempt to succinctly describe the main (not all) features of C++20, and to update these docs as features are moved through the committee...
By Adrien Hamelin | Jun 22, 2018 11:29 AM | Tags: c++17 advanced
Really everything.
Everything You Need to Know About std::any from C++17
by Bartlomiej Filipek
From the article:
With std::optional you can represent some Type or nothing. With std::variant you can wrap several variants into one entity. And C++17 gives us one more wrapper type: std::any that can hold anything in a type-safe way...
By robwirving | Jun 22, 2018 09:01 AM | Tags: None
Episode 155 of CppCast the only podcast for C++ developers by C++ developers. In this episode Rob and Jason are joined by Andreas Fertig to discuss C++ Insights, the Rapperswil ISO meeting and more.
CppCast Episode 155: C++ Insights with Andreas Fertig
by Rob Irving and Jason Turner
About the interviewee:
Andreas Fertig holds an M.S. in Computer Science from Karlsruhe University of Applied Sciences. Since 2010 he has been a software developer and architect for Philips Medical Systems focusing on embedded systems. He has a profound practical and theoretical knowledge of C++ at various operating systems.
He works freelance as a lecturer and trainer. Besides this he develops macOS applications and is the creator of cppinsights.io.
By Adrien Hamelin | Jun 20, 2018 12:31 PM | Tags: community
Have you registered for CppCon 2018 in September? Early bird registration is open now.
While we wait for this year’s event, we’re featuring videos of some of the 100+ talks from CppCon 2017 for you to enjoy. Here is today’s feature:
Fuzz or lose...
by Kostya Serebryany
Summary of the talk:
Fuzzing is a family of testing techniques in which test inputs are generated semi-randomly. The memory unsafety of C++ has made fuzzing a popular tool among security researchers. Fuzzing also helps with stability, performance, and equivalence testing; and it’s a great addition to everyone’s CI.
Our team has launched OSS-Fuzz, the Google's continuous fuzzing service for open source software, and a similar service for our internal C++ developers. Over 1000 C++ APIs are being fuzzed automatically 24/7, and thousands of bugs have been found and fixed.
Now we want to share this experience with the wider C++ community and make fuzzing a part of everyone’s toolbox, alongside unit tests. We will demonstrate how you can fuzz your C++ library with minimal effort, discuss fuzzing of highly structured inputs, and speculate on potential fuzzing-related improvements to C++.
By Adrien Hamelin | Jun 20, 2018 12:29 PM | Tags: intermediate c++17
Another new feature.
C++17: Attributes
by Marc Gregoire
From the article:
C++17 introduces three new code attributes:
- [[fallthrough]]
- [[maybe_unused]]
- [[nodiscard]]
The first one was discussed in detail in my C++17: Fallthrough in switch statements blog post. The others are briefly explains below...
By Blog Staff | Jun 19, 2018 08:09 AM | Tags: None
There’s now a whole website for this frequently asked question, with links to up-to-date answers for C, C++, Java, and C#:
http://isvolatileusefulwiththreads.com/
Bookmark the site. Tell all your friends who need to know. Friends don’t let friends use volatile for inter-thread communication in C and C++.
By triangles | Jun 19, 2018 05:46 AM | Tags: c++11
A collection of personal notes and thoughts on rvalue references, their role in move semantics and how they can significantly increase the performance of your applications.
C++ rvalue references and move semantics for beginners
by Triangles @ internalpointers.com
From the article:
In my previous article Understanding the meaning of lvalues and rvalues in C++ I had the chance to explain to myself the logic behind rvalues. The core idea is that in C++ you will find such temporary, short-lived values that you cannot alter in any way.
Surprisingly, modern C++ (C++0x and greater) has introduced rvalue references: a new type that can bind to temporary objects, giving you the ability to modify them. Why?
By Adrien Hamelin | Jun 18, 2018 12:08 PM | Tags: community
Have you registered for CppCon 2018 in September? Early bird registration is open now.
While we wait for this year’s event, we’re featuring videos of some of the 100+ talks from CppCon 2017 for you to enjoy. Here is today’s feature:
dynamic_cast From Scratch
by Arthur O'Dwyer
Summary of the talk:
This session will introduce you to the C++ object model: the rules by which C++ class objects are translated into memory layouts. We'll quickly cover polymorphic class types and multiple and virtual inheritance. We'll discuss the anatomy of a virtual method call, the difference between `static_cast` and `reinterpret_cast`, and what's contained in a vtable besides function pointers. We'll see that the way `dynamic_cast` thinks about the class hierarchy is slightly different from the way we're used to drawing it; and that `dynamic_cast` is expensive enough that sometimes we can find cheaper ways to ask an object for its type! The climax will be a complete, bug-free, and fast implementation of C++'s built-in `dynamic_cast`, using our own hand-crafted artisanal run-time type information (RTTI).
Attendees will incidentally be exposed to several features of the modern C++ language, including type traits and the `final` qualifier.
This session will mostly be talking about the Itanium C++ ABI, which is the standard on Linux and OS X systems. Mapping these concepts to the MSVC ABI will be left as an exercise for the reader of the project's GitHub repo: https://github.com/Quuxplusone/from-s...
By Adrien Hamelin | Jun 18, 2018 12:07 PM | Tags: advanced
Quick A: the type of the function must be explicit.
Recently on SO:
std::bind overload resolution
You need a cast to disambiguate the overloaded function:
(int(A::*)(int,int))&A::operator()
By Adrien Hamelin | Jun 18, 2018 12:06 PM | Tags: intermediate
Quick A: Only your own type can be accessed.
Recently on SO:
Accessing protected members in a derived class
You can only access protected members in instances of your type (or derived from your type).
You cannot access protected members of an instance of a parent or cousin type.In your case, the Derived class can only access the b member of a Derived instance, not of a different Base instance.
Changing the constructor to take a Derived instance will also solve the problem.