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Effective Modern C++ eBook Sample Content -- Scott Meyers

By Mantosh Kumar | Jan 30, 2015 07:27 PM | Tags: c++14 c++11

Scott Meyers just published on his blog, that one can get a free sample chapter of his EMC++ book.

EMC++ Sample Content

by Scott Meyers

From the article

O'Reilly has decided it's time to turn up the heat on the grand Effective Modern C++ marketing campaign. A key component of that campaign is giving away excerpts of the book, the idea being that if you like the stuff we give away, you're more likely to plunk down some cash for the rest of the book.

CppCon 2014 C++ on Mars: Incorporating C++ into Mars Rover Flight Software--Mark Maimone

By Adrien Hamelin | Jan 30, 2015 08:00 AM | Tags: intermediate

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:

C++ on Mars: Incorporating C++ into Mars Rover Flight Software

by Mark Maimone

(watch on YouTube) (watch on Channel 9)

Summary of the talk:

One of the more challenging aspects of developing flight software (FSW) for NASA's Spirit and Opportunity Mars Exploration Rovers (MER) and Curiosity, the Mars Science Laboratory rover was how to enable them to drive themselves safely through unknown Martian terrain. When the MER mission was approved in the year 2000, JPL researchers had already demonstrated that capability on prototype rovers [1] using software written primarily in C++ on a VxWorks realtime O/S platform with shared memory. So when asked to incorporate that capability into the MER vehicles which also relied on a similar VxWorks realtime O/S, the team concluded it would be safest and most expedient to incorporate the already field-tested C++ software. But that presented a challenge, since at that point all rover FSW development was mandated to be done mainly in the C programming language.

In this talk we present some of the challenges we faced and solutions we found in deploying C++ onto the Mars Rovers. For example, dynamic allocation was initially precluded, but development of a specialized memory allocator (using the C++ "placement new" operator) enabled us to incorporate it safely into the flight system. We will discuss what aspects of C++ were incorporated, what simulation environments aided development, describe some of the tools used to validate system behavior, and explain how our success using C++ for the implementation of autonomous navigation on MER has influenced future FSW efforts.

Yes, we must replace it++ with ++it--Andrey Karpov

By Andrey Karpov | Jan 29, 2015 11:18 PM | Tags: performance iterators c++ basics

I decided to find out if there is practical sense in writing ++iterator instead of iterator++ when handling iterators.

Is it reasonable to use the prefix increment operator ++it instead of postfix operator it++ for iterators?

by Andrey Karpov

From the article:

I will always write ++it. I did so before but I did it "just in case". Now I can see how useful it is because I regularly launch debug versions. In general, of course, ++it has a very slight influence on the running time. But if I don't make such small optimizations in different places of the code, it will be too late and the profiler won't help me. Bottlenecks will be spread throughout the code.

 

Funny bug #20150127--Marco Foco

By Marco Arena | Jan 29, 2015 10:14 AM | Tags: intermediate boost

Marco Foco spotted a subtle bug in a piece of code that used boost::program_options. Can you find it?

Funny bug #20150127

by Marco Foco

From the article:

Two days ago I’ve been asked to have a look at a nonworking piece of code, based on boost::program_options [...] This syntax is not only unusual, but also dangerous. 

Announcing the Meeting C++ Recruiting Service!

By Meeting C++ | Jan 29, 2015 07:31 AM | Tags: recruiting jobs community

News from Meeting C++! Today a new service for job seekers and employers has launched:

Announcing the Meeting C++ Recruiting Service

by Jens Weller

From the article:

A long time in the making, a lot of thinking about what is the correct format to do, and now finally having setup all things, I can announce the start of the Meeting C++ Recruiting Service!

Meeting C++ Recruiting is a service that aims at better connecting the C++ programmers, who are looking for a job, with those companies who are actively looking for talented C++ Programmers.

Interactive Metaprogramming Shell based on Clang

By Meeting C++ | Jan 29, 2015 03:06 AM | Tags: tmp templates intermediate experimental advanced

A new video from Meeting C++ 2014:

Interactive Metaprogramming Shell based on Clang

by Ábel Sinkovics

From the talk description:

Developing metaprograms is hard and painful. Templight (http://plc.inf.elte.hu/templight/) supports the development and debugging of template metaprograms, but the code has to be recompiled after every minor change and tricks are needed to retrieve useful information about the result...

To Be or Not to Be (an Iterator) -- Eric Niebler

By Felix Petriconi | Jan 29, 2015 01:03 AM | Tags: intermediate basics

Eric Niebler gives in his recent blog post insights about iterators

To Be or Not To Be (an Iterator)

by Eric Niebler

From the article:

Way back in 1999, when the ink on the first C++ standard was still damp, Herb Sutter posed a GoTW puzzler in the still extant C++ Report (RIP): When Is a Container Not a Container? In that article, Herb described the problems of the now-infamous vector<bool>. According to the standard’s own container requirements, vector<bool> is not a container.

In a nutshell, it’s because vector<bool>‘s iterators claim to be random-access, but they’re not. Random-access iterators, when you dereference them, must return a real reference. They can only do that if the thing they point to really exists somewhere. But the bool that a vector<bool>::iterator points to does not exist anywhere. It’s actually a bit in a packed integer, and dereferencing a vector<bool>‘s iterator returns an object of some type that merely acts like a bool& without actually being a bool&.

Experimenting with a Proposed Standard Drawing Library for the C++ language -- Eric Mittelette

By Blog Staff | Jan 28, 2015 08:42 PM | Tags: None

Today on MSOT:

Experimenting with a Proposed Standard Drawing Library for the C++ language

by Eric Mittelette

From the article:

Back in July, Michael McLaughlin, Herb Sutter, and Jason Zink submitted to the ISO an updated proposal to standardize a 2D Graphics API for the C++ programming language. The ISO C++ Committee will evaluate the proposal for the possible inclusion of these new features in the next versions of the specification.

Given MS Open Tech’s historical interest in cross-platform graphics development, we took a closer look. In an attempt to familiarize with the API from the perspective of a C++ developer, we developed a sample app that we just contributed to Michael’s github repository. In the sections below, we share some salient aspects of how this new crop of Graphics experiences built with “straight” C++ could be written, only a few years from now!
 

 

The compiler can make up its own calling conventions, within limits--Raymond Chen

By Herb Sutter | Jan 28, 2015 12:43 PM | Tags: advanced

A new article from the Old New Thing:

The compiler can make up its own calling conventions, within limits

by Raymond Chen

From the article:

There are three parties to a calling convention. The function doing the calling. The function being called. The operating system. The operating system needs to get involved if something unusual occurs, like an exception, and it needs to go walking up the stack looking for a handler...