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Yes, this is post #10 in the C++ 11 series. The last post was long and complicated. In this post, I would like to write about something simpler - Ranged base loops. Ranged Based Loops, are like the C# foreach loop. The idea is to simplify iteration syntax on containers that have a begin ning, an end ing, and a forward iterator . Suppose we have this vector: vector < int > v ; for ( int i = 1 ; i <= 10 ; ++ i ) v . push_back ( i ); To iterate through...
Take a deep breath; this is a long post about one of the most important and most complex features of C++ 11. One of the most performance-boost features of C++ 11 is the new move semantics addition to the language. This feature is based on a new reference – an R-Value reference. In this post, I am going to explain what R-Value (and L-Value) is, why we need it, and how we can use it to enable move constructor & move assignment operator. We will also see the std::move function and talk about perfect...
תגים:C++, VC, DEV, Visual Studio, CodeValue, C++ Renaissance, C++ 11, Visual Studio 2012, move contructor, move assignment operator, R-Value reference
One of the most important features of C++ 11 is the addition of Lambda, an inline function mechanism (and a closure). Motivation The first motivation is to make this a valid C++ code: [](){}(); There are many reasons to use lambda and functional programing; for example, STL algorithms use function or functor objects. STL < functional > provides a set of functors such as plus , minus , less , equal_to , etc. Most of these functors are binary functions, i.e. they take two parameters. To use a...
There is a joke, were a guy asks his friend, “Do you know what this is?” Doing some sort of wave shape movement with his hand. When his friend answers, “I don’t know”, the guy replies, “I don’t know either, but here comes another one like this!” decltype is, like the joke says, “another one like this”. It provides a way to use the type of an expression in any place that a type can be used: Declare a variable where the type of a given expression defines its type. Declare a function where its return...
Originally, auto declares a variable in the automatic storage, which is also the default behavior. This is still the behavior of the C language. In C++ 11, auto declares a variable, whose type is deduced from the initialization expression. If you are familiar with the C# var keyword, auto is almost the same. The main difference is that modifiers such as const, &, *, **, &&, static , and volatile can be added to the auto to enhance type declaration. auto is a productivity feature, it lets...
Many of the new features of C++ 11 came from a real need, not just to make the language more productive but also to enable real-life scenarios. The ability to catch exception in one place in runtime environment and to re-throw it later came from the need to provide a better concurrency support in the language and libraries. C++ 11 has many new concurrent abilities that I will talk about in future posts, but now let us just say that we have, in standard C++, the ability to create and use threads....
If you are familiar with C#/.NET enums, you know how safer and easier it is to have scoped enums. Like C#, the new C++ enums are scoped, and you can choose the underlined integral type for the enum. Old C++ enum: enum old_enum { old_value }; The new syntax: (similar to the C# syntax) enum newer_enum : unsigned long long { newer_value = ~( unsigned long long ) 0 }; The new enum provides: enumerators...
In this post, I am going to write about a new feature, that your response might be “Ha! I didn’t know I can do that”. The old C++ standard says that local types, unnamed types and in general, types with no linkage, shall not be used as template arguments. In C++ 11 this has been solved : local types have the same linkage as their enclosing function Unnamed types have the same linkage they would have if they were named To show the change look at this code: template < class T > void typeid_of...
nullptr is a real NULL pointer. Look at this sample: void nullptr_overload( int i) { cout << "int" << endl; } void nullptr_overload( int *p) { cout << "int *" << endl; } void main() { nullptr_overload(0); nullptr_overload(NULL); nullptr_overload( nullptr ); } Can you guess the result? The new nullptr is not another...
C++ 11, formerly known as C++0x, was published as ISO/IEC 14882:2011 in September 2011. The standard document is available for a fee, however the most recent draft, before the release, was N3242 and the most recent working draft freely available is N3337 , dated 26 January 2012. C++11 includes several additions to the core language and extends the C++ standard library incorporating most of C++ TR1 libraries and many other features, most of them originated from the boost library. C++ 11 is...
תגים:C++, VC, C++0x, PDC, DEV, Visual Studio, VS 2010, C++ Renaissance, Windows 8, C++ 11, Visual Studio 2012, Windows Phone
Since the release of Kinect for PC I had the opportunity to take part and be involved with several Kinect based projects. Starting developing with the Kinect SDK is something that most .NET and native C++ developers can handle very easily. Just download and install the SDK, hook a Kinect device (you can use the Xbox Kinect , however you will need a power cable and do remember that it is just for the development process and some features, like near mode , will not work), run the Kinect toolkit browser...
Like any Windows API , Windows Store Application s API is based on native code. Unlike the old Win32 API, the new native interface is not based on the C language prototype, nor the old COM programming model. Microsoft has realized that the .NET type system provides modern, richer and more productive alternative. To have .NET productivity in native code, Microsoft has borrowed the type system principles ( ECMA 335 CLI type system) and merged it with the COM programming model. In Windows Store API...
תגים:C++/CLI, C++, MVP, DEV, CPP/CLI, CodeValue, Microsoft, Windows 8, C++ 11, Visual Studio 2012, XAML, Hilo, C++/CX
I had the honor to deliver the first lecture of the first Israeli . NET (Un)Conference . Thanks to Adi Av, a bunch of .NET developers got early last Friday morning just to talk and hear about .NET technologies. Erez & I came early to see, meet and talk with those people that agree to spend Friday morning with other developers. Just the people we like! My lecture was about the latest Kinect SDK . I showed how easy is to develop applications using C# as well as C++ with the Kinect. The atmosphere...
Windows NT 6.x (Vista/Server 2008 and above) has many reliability mechanisms. Among them you can find the Windows Error Report , Application Restart & Recovery , The Restart Manager , and the Kernel Transaction Manager with Two resource managers, the Transactional Registry and Transactional NTFS , or in short TxF. However today I found out that it is no longer recommended to use TxF and that there are “better” alternatives, according to the MSDN documentation for CreateFileTransacted : [Microsoft...
תגים:C++, Win32, Windows Server 2008, DEV, Server 2008 R2, Server 2008, Windows 7, CodeValue, Windows 8, File System, TxF, Transaction
Overview .NET is great platform, it speeds up the development process, you deal with your application logic and in most cases you don't need to know that there is whole Windows operating system down there. However sometimes you do need to program against Windows without the .NET assistance. As a Windows developer, you need to keep all your weapons ready, be it .NET, COM or C++ with the native Win32 API. In this article I am going to show how to deal with Windows Message based communication protocol...
תגים:C++/CLI, C++, VC, Win32, Interop, C#, DEV, Windows 7, Visual Studio, VS 2010, CPP/CLI, CodeValue, Windows
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