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Iterators++, Part 1--Eric Niebler

By Adrien Hamelin | Feb 4, 2015 01:53 PM | Tags: c++11 advanced

A new post on iterators:

Iterators++, Part 1

by Eric Niebler

From the article:

In the last post, I described the so-called proxy iterator problem: the fact that iterators that return proxy references instead of real references don’t sit comfortably within the STL’s framework. Real, interesting, and useful iterators fall foul of this line, iterators like vector<bool>‘s or like the iterator of the zip view I presented. In this post, I investigate what we could do to bring proxy iterators into the fold — what it means for both the iterator concepts and for the algorithms. Since I’m a library guy, I restrict myself to talking about pure library changes...

Still Comparing "this" Pointer to Null?--Dmitry Meshcheryakov

By Andrey Karpov | Feb 4, 2015 10:07 AM | Tags: basics

The article explains why one must never use the (this == 0) expression. It's a very bad code. It being able to work at times doesn't mean anything. By writing (this == 0), you let undefined behavior into your program.

Still Comparing "this" Pointer to Null?

by Dmitry Meshcheryakov

From the article:

In the same way the compiler can optimize the code comparing "this" pointer to null. According to the Standard, this cannot be null and therefore the checks and the corresponding code branches can be eliminated, which will greatly affect the code dependent on the comparison of "this" pointer to null. The compiler has a full right to "break" (actually just break it further) the code CWindow::GetSafeHandle() and generate machine code which doesn't contain the comparison and only reads the class field all the time.
...
GOOD LORD, the "this" pointer equals 0x00000004 on entering the method when compiled in Visual C++ 9, as the pointer initially set to null is adjusted so that it points to the beginning of a subobject of the corresponding class.

CppCon 2014 Back to the Basics! Essentials of Modern C++ Style--Herb Sutter

By Adrien Hamelin | Feb 4, 2015 08:00 AM | Tags: intermediate c++14 c++11

While we wait for CppCon 2015 in September, we’re featuring videos of some of the 100+ talks from CppCon 2014. Here is today’s feature:

Back to the Basics! Essentials of Modern C++ Style

by Herb Sutter

(watch on YouTube) (watch on Channel 9)

Summary of the talk:

This talk revisits basic questions, such as how to declare and initialize a variable, how to pass a value to a function, how to write a simple loop, and how to use smart pointers, in the light of experience with C++11 and the latest C++14 refinements. This involves examining auto, rvalue references, range-for loops, uniform initialization, lambda expressions, unique_ptr and shared_ptr, and more.

Snail: Continuation-ready algorithms from STL algorithms -- Manu Sánchez

By Jordi Mon Companys | Feb 3, 2015 07:48 AM | Tags: stl monads continuation-ready algorithms

Monads in use, finally!!

Snail | Continuation-ready algorithms from STL algorithms

by Manu Sánchez

From the article:

Snail is my try to get a continuation-ready set of algorithms to operate on C++ containers, but instead of reinventing all the algorithms, addapting them through a continuation monad (or something resembling a continuation monad).

No need to square, sum, and sqrt manually anymore--Indi

By Adrien Hamelin | Feb 2, 2015 03:36 PM | Tags: c++11 basics

A useful remainder for programmers, the std::hypot function:

No need to square, sum, and sqrt manually anymore

by Indi

From the article:

I hang out a lot with engineers and game programmers, so that means I tend to see a lot of code dealing with physics problems. One of the most commonly used bits of code in both domains has to be the Euclidean distance equation. However, few programmers realize that that equation is a lot easier than it used to be...

Improving error messages in C++ by transporting substitution failures--Paul Fultz II

By Adrien Hamelin | Feb 2, 2015 03:29 PM | Tags: c++11 advanced

A useful post for library writers:

Improving error messages in C++ by transporting substitution failures

by Paul Fultz II

From the article:

This is an advanced blog post more geared to library writers who want to improve error messages due to substitution failure. It discuss how substitution failures can be transported so the correct information can be presented to the user. Lets first look at the problem...

The bell has tolled for rand()--Indi

By Adrien Hamelin | Feb 2, 2015 03:07 PM | Tags: experimental c++11 advanced

An extensive article about rand(), it's replacement in C++11 and the possible future was posted last december:

The bell has tolled for rand()

by Indi

Form the article:

In their recent meeting in Urbana, the C++ standard committee took the rare step of removing several outdated facilities from (what will probably become) C++17. Most of the things removed had been deprecated since C++11, but there was one surprising item on the list: std::random_shuffle(). Its removal is a signal of a big change that has been building in the background for a while: the end of std::rand()...

C++ User Group Meetings in February

By Meeting C++ | Feb 2, 2015 09:06 AM | Tags: community c++14 c++11 boost basics

New month, and a few more C++ User Group Meetings:

C++ User Group Meetings in February

by Jens Weller

From the article:

Again an overview on the upcoming meetings of C++ User Groups. This time, its February again, the shortest, and in a lot of places coldest month of the year. Still, 19 C++ User Groups have already...

The Meetings:

4.2 C++ UG Saint Louis - DD Part 2 - Lambdas
7.2 C++ UG Italy - Pordenone
11.2 C++ UG Utah - Asynchronous Messaging with ØMQ
11.2 C++ UG San Francisco/ Bay area - CopperSpice
11.2 C++ UG Santa Barbara - Introduction to OpenGL with SDL
12.2 C++ UG Dresden - Clean code in asynchronous Programming
12.2 C++ UG Wroclaw - Databases & C++: SOCI, boost::python
16.2 C++ UG Denver - Denver Tech Center C++ Developers
16.2 C++ UG Austin - North Austin Monthly C/C++ Pub Social
17.2 C++ UG Berlin - First meeting at think-cell
18.2 C++ UG Bristol - Kevlin Henney: Making Steaks from Sacred Cows
18.2 C++ UG Düsseldorf - Treffen der C++ User Gruppe NRW
18.2 C++ UG Hamburg - Treffen der C++ User Gruppe Hamburg
19.2 C++ UG Ruhrgebiet - February C++ Meetup in the Ruhr area
21.2 C++ UG Pune, India - Introduction to Concurrency and Memory Models
24.2 C++ UG Warsaw - Overload resolution oraz Zakamarki C++
24.2 C++ UG Edinburgh - First Meeting
25.2 C++ UG San Francisco/ Bay area - Workshop and Discussion Group
26.2 C++ UG Munich - "Dreaming of Names" and "A short (and practical) introduction to

CppCon 2014 Paying for Lunch: C++ in the ManyCore Age

By Adrien Hamelin | Feb 2, 2015 08:00 AM | Tags: experimental c++17

While we wait for CppCon 2015 in September, we’re featuring videos of some of the 100+ talks from CppCon 2014. Here is today’s feature:

Paying for Lunch: C++ in the ManyCore Age

moderated by Herb Sutter, with Pablo Halpern, Jared Hoberock, Artur Laksberg, Ade Miller, Gor Nishanov and Michael Wong.

(watch on YouTube) (watch on Channel 9)

Summary of the talk:

Concurrency is one of the major focuses of C++17 and one of the biggest challenges facing C++ programmers today. Hear what this panel of experts has to say about how to write concurrent C++ now and in the future.