Skip to main content

C++11 - Right angle bracket

In C++03 ">>" is always interpreted as right shift operator. It causes problem for nested template declaration like here:
In above example for C++03 we have compilation error because of unintended interpretation of ">>". Compiler interpret it as right shift operator - not like two nested vectors. Proper syntax in above situation should include space character between two ">" characters closing nested templates like here:
It it not very comfortable and sometimes causes problems with finding reason of compilation error. Fortunately, C++11 standard solves that problem. It implements proper interpretation of nested templates without space between two right angle operators ">". Therfore in C++11 following syntax:
is properly interprated as two nested vectors.

Comments

  1. This comment has been removed by the author.

    ReplyDelete
  2. This comment has been removed by a blog administrator.

    ReplyDelete
  3. I like that change very much. It was very anoying syntax for nested templates in previous C++ version.

    ReplyDelete

Post a Comment

Popular posts from this blog

Blog's new layout

As you noticed this blog has new layout from today. I hope you like it. I think new layout looks better and more modern than previous one. Please, write you opinion about new layout in comments. If you have some ideas how to make this blog better, all ideas are welcomed. Enjoy new layout and blog articles.

QT - foreach algoriithm with const references performance improvement

Today I would like to show you optimal way of using foreach QT algorithm . I will show you why we should pass elements of foreach algorithm by const reference instead of passing them by value. Let me explain it on the below example: Output of this example is: In point I we are creating 3 objects of MyClass class and push them to myClasses QList element. In point II we are using QT foreach algorithm to invoke getValue() method for each object from myClasses list. As you can see on output text for that part of code we are invoking copy constructor before and destructor after invoking getValue() function. It is because we are passing each myClasses list element to foreach algorithm by value. Therefore we are copying that element at the beginning of foreach loop step and removing them (destructing) at the end. This is inefficient solution, especially when class of object being copied is big. It decreases performance. of our application. Solution for that i...

C++ in 2014 - Predictions

Today I would like to share with you interesting article about prediction of development C++ programming languages (and its well-known frameworks and libraries) in 2014. It is written by Jens Weller and I think it is very interesting for every C++ programmer and user. You can open this article by clicking on the image below: Enjoy!