vb.net 2008 barcode generator A QUICK TOUR OF THE C++/CLI LANGUAGE FEATURES in Visual C#

Maker PDF 417 in Visual C# A QUICK TOUR OF THE C++/CLI LANGUAGE FEATURES

CHAPTER 2 A QUICK TOUR OF THE C++/CLI LANGUAGE FEATURES
PDF 417 Encoder In C#
Using Barcode printer for Visual Studio .NET Control to generate, create PDF417 image in VS .NET applications.
www.OnBarcode.com
Decode PDF-417 2d Barcode In C#
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
public: Atom(Point3D pos, unsigned int a, unsigned int n) : position(pos), atomicNumber(a), isotopeNumber(n) { } Point3D GetPosition() { return position; } void SetPosition(Point3D new_position) { position = new_position; } // The rest of the code is unchanged. }; The value type Point3D is used as a member, return value, and parameter type. In all cases you use it without the handle. You ll see later that you can have a handle to a value type, but as this code is written, the value type is copied when it is used as a parameter, and when it is returned. Also, when used as a member for the position field, it takes up space in the memory layout of the containing Atom class, rather than existing in an independent location. This is different from the managed array implementation, in which the elements in the pos array were in a separate heap location. Intensive computations with this class using the value struct should be faster than the array implementation. This is the sweet spot for value types they are very efficient for small objects.
QR Code ISO/IEC18004 Encoder In C#
Using Barcode encoder for Visual Studio .NET Control to generate, create QR Code JIS X 0510 image in .NET framework applications.
www.OnBarcode.com
Code 128A Printer In Visual C#.NET
Using Barcode generator for VS .NET Control to generate, create USS Code 128 image in Visual Studio .NET applications.
www.OnBarcode.com
Enumeration Classes
Make 2D Barcode In Visual C#.NET
Using Barcode maker for .NET Control to generate, create 2D Barcode image in .NET applications.
www.OnBarcode.com
Printing Barcode In C#
Using Barcode drawer for .NET framework Control to generate, create Barcode image in .NET applications.
www.OnBarcode.com
So, you ve seen all the managed aggregate types except interface classes and enumeration classes. The enumeration class (or enum class for short) is pretty straightforward. It looks a lot like a classic C++ enum, and like the C++ enum, it defines a series of named values. It s actually a value type. Listing 2-6 is an example of an enum class. Listing 2-6. Declaring an Enum Class // elements_enum.cpp enum class Element { Hydrogen = 1, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon // ... 100 or so other elements omitted for brevity };
Draw GS1-128 In C#.NET
Using Barcode drawer for Visual Studio .NET Control to generate, create GS1 128 image in .NET applications.
www.OnBarcode.com
USPS PLANET Barcode Maker In Visual C#.NET
Using Barcode generation for VS .NET Control to generate, create Planet image in VS .NET applications.
www.OnBarcode.com
CHAPTER 2 A QUICK TOUR OF THE C++/CLI LANGUAGE FEATURES
PDF417 Recognizer In Visual Basic .NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
PDF417 Scanner In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
While we could have listed these in the order they appear in the Tom Lehrer song The Elements (a classic sung to the tune of Major-General s Song ), we ll list them in order of increasing atomic number, so we can convert between element type and atomic number easily. The methods on the enum class type allow a bit of extra functionality that you wouldn t get with the old C++ enum. For example, you can call the ToString method on the enum and use that to print the named value. This is possible because the enum class type, like all .NET types, derives from Object, and Object has a ToString method. The .NET Framework Enum type overrides ToString, and that implementation returns the enum named value as a String. If you ve ever written a tedious switch statement in C or C++ to generate a string for the value of an enum, you ll appreciate this convenience. We could use this Element enum in our Atom class by adding new method GetElementType to the Atom class, as shown in Listing 2-7. Listing 2-7. Using Enums in the Atom Class ref class Atom { // ... Element GetElementType() { return safe_cast<Element>( atomicNumber ); } void SetElementType(Element element) { atomicNumber = safe_cast<unsigned int>(element); } String^ GetElementString() { return GetElementType().ToString(); } }; Notice a few things about this code. Instead of the classic C++ static_cast (or dynamic_cast), we use a casting construct that is introduced in C++/CLI, safe_cast. A safe cast is a cast in which there is, if needed, a runtime check for validity. Actually, there is no check to see whether the value fits within the range of defined values for that enum, so in fact this is equivalent to static_cast. Because safe_cast is safer for more complicated conversions, it is recommended for general use in code targeting the CLR. However, there may be a performance loss if a type check must be performed at runtime. The compiler will determine whether a type check is actually necessary, so if it s not, the code is just as efficient as with another form of cast. If the type check fails, safe_cast throws an exception. Using dynamic_cast would also result in a runtime type check, the only difference being that dynamic_cast will never throw an exception. In this particular case (Listing 2-7), the compiler knows that the enum value will never fail to be converted to an unsigned integer.
Make Barcode In Java
Using Barcode maker for Java Control to generate, create Barcode image in Java applications.
www.OnBarcode.com
QR Generation In None
Using Barcode creator for Online Control to generate, create QR Code ISO/IEC18004 image in Online applications.
www.OnBarcode.com
ANSI/AIM Code 39 Recognizer In .NET Framework
Using Barcode recognizer for .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Encode Barcode In Java
Using Barcode drawer for BIRT Control to generate, create Barcode image in BIRT applications.
www.OnBarcode.com
QR Code ISO/IEC18004 Generation In Objective-C
Using Barcode maker for iPhone Control to generate, create QR-Code image in iPhone applications.
www.OnBarcode.com
Barcode Creator In Objective-C
Using Barcode maker for iPad Control to generate, create Barcode image in iPad applications.
www.OnBarcode.com
Generating Code39 In None
Using Barcode creator for Font Control to generate, create Code 39 Full ASCII image in Font applications.
www.OnBarcode.com
Barcode Recognizer In Visual C#
Using Barcode scanner for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Code 128A Reader In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
UPC Code Decoder In Visual Basic .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.