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By Blog Staff | Jun 30, 2014 09:50 AM | Tags: basics
Quick A: Yes.
Recently on SO:
std::vector: contiguous data and copy/move
I have two questions for the following code: 1) Will the elements of
facesbe contiguous? 2) Doesstd::vectorcopy or moveFace fwhen inserting it?#include <vector> int main() { struct Face {}; std::vector<Face> faces; for (int i=0; i<10; ++i) { Face f; faces.push_back (f); } return 0; }
By Blog Staff | Jun 23, 2014 10:24 AM | Tags: intermediate basics
Now available online, a nice talk by Scott Meyers about why modern C++ is alive and continues to enjoy life and growth:
by Scott Meyers
The Vasa was a 17th-century Swedish warship which suffered such feature creep during construction that it sank shortly after leaving the harbour on its maiden voyage. In the early 1990s, the C++ standardisation committee adopted the Vasa as a cautionary tale, discouraging prospective language extensions with "Remember the Vasa!" Yet C++ continued to grow, and by the time C++ was standardised, its complexity made the Vasa look like a rowboat.
The Vasa sank, however, while C++ cruised, and it looks likely to continue doing so even as the latest revised standards (C++11 and C++14) add dozens of new features, each with its own idiosyncrasies. Clearly, C++ has gotten some important things right. In this talk, Scott Meyers considers the lessons to be learned from the ongoing success of a complex programming language that's over 30 years old, yet very much alive and kicking.
By Blog Staff | Jun 13, 2014 03:10 AM | Tags: basics
Quick A: Yes. Otherwise, it would be unsafe and a lot less unique.
From SO:
Is
unique_ptrguaranteed to storenullptrafter move?std::unique_ptr<int> p1{new int{23}}; std::unique_ptr<int> p2{std::move(p1)}; assert(!p1); // is this always true?
By Blog Staff | May 28, 2014 07:23 PM | Tags: intermediate basics
Today on Kukuruku:
Ref-qualified member functions
by Alexander Kulikov
From the article:
Today I’m going to tell you about a new and a little known (to my mind) C++ feature — reference-qualified member functions. I’ll tell about the rules of such functions overloading and, as an example of use, I’ll show you that with the help of ref-qualified you can try to improve the resource management scheme, which is implemented with the help of another C++ idiom — RAII.
By Blog Staff | May 22, 2014 12:01 PM | Tags: basics
Quick A: Because you can only capture local (stack) objects, including function parameters, and to access a data member in a member function you capture the local variable this.
Today on SO:
Why can't a data member be in a lamba capture list
I have a class
foothat hasbaras a member variable.In another member function of the class, I'm writing a lambda function:
[bar](void){}But I can't include
barin the capture list. Why is that?
By Blog Staff | May 12, 2014 08:31 AM | Tags: basics
Quick A: They generate a templated operator(), and that means you can call the same closure object with all sorts of different parameters and it just stamps out the function for each set of parameter types.
A "new classic" question on SO, classic because it was posted a year ago, but newly relevant because now the mainstream compilers are implementing the feature:
How does generic lambda work in C++14?
How does generic lambda work (
autokeyword as argument type)?Is it similar to templates where for each different argument type compiler generates functions with the same body but changed types or is it more similar to Java's generics?
Code example:
auto glambda = [](auto a) { return a; };
By Blog Staff | May 8, 2014 10:16 AM | Tags: basics
Stroustrup's introduction to programming book has now been updated for modern C++. The Preface was posted on InformIT:
Preface to Bjarne Stroustrup's Programming: Principles and Practice Using C++, 2nd Edition
by Bjarne Stroustrup
From the preface:
This book is for someone who has never programmed before but is willing to work hard to learn. It helps you understand the principles and acquire the practical skills of programming using the C++ programming language. My aim is for you to gain sufficient knowledge and experience to perform simple useful programming tasks using the best up-to-date techniques. How long will that take? As part of a first-year university course, you can work through this book in a semester...
By Meeting C++ | May 7, 2014 03:11 AM | Tags: usergroup community basics
Again, a list of user group meetings for this month. In total its going to be 16 user groups meeting this month:
C++ User Group Meetings in May 2014
by Jens Weller
From the Article:
The Meetings
8th May C++ UG Aachen - SIMD Programmierung
8th May C++ UG Belgium
Parallelism in the C++ Standard, what to expect from C++17
Asynchronous Programming with futures and await
8th May C++ UG Dresden - C++ Memory Model
8th May C++ UG New York - Whats next for C++
13th May C++ UG Philadelphia - Profiling and Perfomance
14th May C++ UG San Francisco/Bay area
15th May C++ UG Malmö/Sweden - Battle of the build systems
19th May C++ UG Denver - CppNow, Eclipse Configuration, Qt Creator and more...
20th May C++ UG Berlin - C++ in the demo scene
21st May C++ UG Düsseldorf - Expression Templates
21st May C++ UG Hamburg
21st May C++ UG Seattle/Northwest - Agile Architecture
23rd May C++ UG Paris
Introspection et reflection en C++
Le SIMD en pratique avec boost SIMD
Clang & C++
27th May C++ UG Chicago
28th May C++ UG Heidelberg
28th May C++ UG San Francisco/Bayarea - C++Now tripreport
By Blog Staff | May 1, 2014 07:54 PM | Tags: basics
If you're new to C++, the question isn't whether you will ask this question, but when.
A classic from SO:
What is an undefined reference/unresolved external symbol error and how do I fix it?
What are undefined reference/unresolved external symbol errors? What are common causes and how to fix them?
By Meeting C++ | Apr 30, 2014 10:16 AM | Tags: qt basics
Recently I could play around with Qt5 JSON API:
Qt & JSON
by Jens Weller
From the Article:
With Qt5 there is a new API for reading and writing JSON files in Qt. In the last days I had the chance to play around with this API, as I implemented importing and exporting different data sets from and to JSON.