June 16-21, Sofia, Bulgaria
September 13-19, Aurora, CO, USA
October 25, Pavia, Italy
November 6-8, Berlin, Germany
November 16-21, Kona, HI, USA
By Adrien Hamelin | Jun 3, 2019 11:55 AM | Tags: performance
Quick A: performance.
Recently on SO:
Why does moving std::optional not reset state?
In a word: Performance.
One of the chief motivating reasons for move semantics to exist in the first place is performance. So the special operations move construction and move assignment should be as fast as possible for all types...
By Adrien Hamelin | Jun 3, 2019 11:47 AM | Tags: stl intermediate
What do you think?
The Difference Between std::copy_backward and std::copy with Reverse Iterators
by Jonathan Boccara
From the article:
A couple of months ago, I made a talk at the ACCU conference about learning every algorithm there is in the STL. Amongst them, we covered std::copy_backward, that makes a copy of a source range to a destination range, starting from its end and working its way back to the beginning.
In the questions session at the end of the talk, attendant Oscar Forner rose an interesting point: is there any difference between performing a std::copy_backward versus performing a simple std::copy on the reverse iterators from the source collection?
By Meeting C++ | Jun 3, 2019 06:35 AM | Tags: None
One more week to submit your talk to this years Meeting C++ conference:
Seven days to submit your talk to Meeting C++ 2019!
by Jens Weller
From the article:
A reminder: you have until next week Monday to submit your talk to this years Meeting C++ conference! Submission deadline is the 10th June at 23:59 Berlin time! Submit your talk to Meeting C++ 2019!
By robwirving | May 31, 2019 07:20 AM | Tags: None
Episode 200 of CppCast the first podcast for C++ developers by C++ developers. In this episode Rob and Jason are joined by ISO chair Herb Sutter to discuss C++20 and his goal of simplifying the C++ of the future.
CppCast Episode 200: Simplifying C++ with Herb Sutter
by Rob Irving and Jason Turner
About the interviewee:
Herb Sutter is an author, chair of the ISO C++ committee, and a systems languages architect at Microsoft.
By Adrien Hamelin | May 30, 2019 01:39 PM | Tags: community
A common problem with a common solution made easier.
strong_typedef - Create distinct types for distinct purposes
by Anthony Williams
From the article:
One common problem in C++ code is the use of simple types for many things: a std::string might be a filename, a person's name, a SQL query string or a piece of JSON; an int could be a count, an index, an ID number, or even a file handle. In his 1999 book "Refactoring" (which has a second edition as of January 2019), Martin Fowler called this phenomenon "Primitive Obsession", and recommended that we use dedicated classes for each purpose rather than built-in or library types...
By Adrien Hamelin | May 30, 2019 12:59 PM | Tags: community
The series continue.
C++ Core Guidelines: std::array and std::vector are your Friends
by Rainer Grimm
From the article:
In 99 % of your use-cases for a sequential container, you are totally fine with a std::array or a std::vector. What? If you don't believe me, read this post...
By Adrien Hamelin | May 29, 2019 12:26 PM | Tags: stl performance c++14
Did you know?
Heterogeneous Lookup in Ordered Containers, C++14 Feature
by Bartlomiej Filipek
From the article:
If you have a map of strings, like std::map<std::string, int> m; and you want to find some element by m.find("abc"). Do you have to pay the price and construct a std::string object? Can you optimize it?
Let’s have a look at one feature enabled in C++14 that might help optimize such container access...
By Adrien Hamelin | May 29, 2019 12:22 PM | Tags: community
You should try it!
Compiler Explorer with code execution support — now in early beta
By Adrien Hamelin | May 29, 2019 12:20 PM | Tags: intermediate
Quick A: to disambiguate.
Recently on SO:
When should I make explicit use of the `this` pointer?
Usually, you do not have to, this-> is implied.
Sometimes, there is a name ambiguity, where it can be used to disambiguate class members and local variables. However, here is a completely different case where this-> is explicitly required.
Consider the following code: template<class T> struct A { int i; }; template<class T> struct B : A<T> { int foo() { return this->i; } }; int main() { B<int> b; b.foo(); }If you omit this->, the compiler does not know how to treat i, since it may or may not exist in all instantiations of A. In order to tell it that i is indeed a member of A<T>, for any T, the this-> prefix is required.
Note: it is possible to still omit this-> prefix by using:
template<class T> struct B : A<T> { using A<T>::i; // explicitly refer to a variable in the base class int foo() { return i; // i is now known to exist } };
By Adrien Hamelin | May 27, 2019 11:56 AM | Tags: community
It's trip report time!
Core C++ 2019 Trip Report
by Anastasia Kazakova
From the article:
More and more C++ events, community meetups, and conferences are appearing around the globe. 2019 is definitely looking like a year for new C++ conferences. Take, for example, C++ on Sea (UK, in February) or the upcoming CPPP (France, in June). Even C++ Russia now has two editions per year – one in Moscow and one in St. Petersburg. And, finally, there’s the event we just visited – Core C++, held in Tel Aviv, Israel...