vb.net 2008 barcode generator Reference Types and Value Types in C#

Make PDF 417 in C# Reference Types and Value Types

Reference Types and Value Types
PDF-417 2d Barcode Encoder In C#.NET
Using Barcode creation for Visual Studio .NET Control to generate, create PDF417 image in .NET framework applications.
www.OnBarcode.com
Reading PDF417 In C#
Using Barcode reader for .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Every managed type falls into one of two categories: reference types or value types. The difference between value types and reference types is that value types have value semantics while reference types have reference semantics. Value semantics means that when an object is assigned (or passed as a parameter), it is copied byte for byte. Reference semantics means that when an object is assigned (or passed as a parameter), the object is not copied; instead, another reference to that same object is created. Value types are used for objects that represent a value, like a primitive type or a simple aggregate (e.g., a small structure), especially one that is to be used in mathematical computations. Computations with value types are more efficient than with reference types because reference types incur an extra level of indirection; reference types exist on the heap and can only be accessed through the handle, while the value type holds its value directly. Value types actually live in a limited scope, either as an automatic variable at function scope or in the scope of another object as a field. They also do not have the overhead of an object header, as reference types do. However, value types are limited in many ways. Value types are often copied for example, when used as a method parameter, a copy is automatically created so they are not suitable for large objects; they also cannot be used in inheritance hierarchies, and they don t support more complex and powerful object operations such as copy constructors, nontrivial default constructors, assignment operators, and so on. Value types are useful for simple aggregates that are frequently passed around or used in computations, such as a complex number, a point, or a simple buffer. Reference types are used wherever reference semantics are required and when modeling more complex objects for which the limitations of value types are too restrictive. They may inherit from another class and may in turn be inherited from. Thus they may be used to model complex objects. They are not copied byte for byte (for example, when passed as an argument to a function), rather, they are passed as references, so they may be large and not suffer a penalty from excessive copying. They can have special member functions such as default constructors, destructors, copy constructors, and the copy assignment operator (although neither type can have overloaded operators new and delete). The actual objects live on the managed heap. The
Generating Barcode In Visual C#.NET
Using Barcode generator for VS .NET Control to generate, create Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Drawing Code 128B In C#.NET
Using Barcode encoder for VS .NET Control to generate, create Code 128B image in .NET framework applications.
www.OnBarcode.com
CHAPTER 1 INTRODUCING C++/CLI
Painting Barcode In C#.NET
Using Barcode creation for Visual Studio .NET Control to generate, create Barcode image in .NET applications.
www.OnBarcode.com
Encoding Linear 1D Barcode In Visual C#.NET
Using Barcode creation for Visual Studio .NET Control to generate, create Linear Barcode image in VS .NET applications.
www.OnBarcode.com
handle itself is just an address that refers to the object s header (which is 8 bytes in size for the 32-bit CLR) on the heap. Figure 1-1 shows the memory layout of a typical value type and a reference type.
Data Matrix 2d Barcode Drawer In C#
Using Barcode maker for VS .NET Control to generate, create Data Matrix image in .NET applications.
www.OnBarcode.com
Generate Postnet In C#
Using Barcode creator for .NET Control to generate, create Postnet image in Visual Studio .NET applications.
www.OnBarcode.com
Figure 1-1. Storage characteristics of reference types and value types. Value types are shown here on the stack (although they could also be a part of an object on the managed heap). Reference types involve a handle plus an object on the managed heap.
PDF-417 2d Barcode Printer In None
Using Barcode drawer for Font Control to generate, create PDF-417 2d barcode image in Font applications.
www.OnBarcode.com
Paint PDF 417 In Java
Using Barcode drawer for Java Control to generate, create PDF-417 2d barcode image in Java applications.
www.OnBarcode.com
The CLI and the .NET Framework
Make UPC-A Supplement 5 In Java
Using Barcode generator for Java Control to generate, create UPC-A Supplement 5 image in Java applications.
www.OnBarcode.com
GTIN - 13 Generation In None
Using Barcode maker for Office Word Control to generate, create UPC - 13 image in Word applications.
www.OnBarcode.com
The CLI includes the VES and a standardized set of class libraries, often called the base class library (BCL), that provides support for fundamental programming. The .NET Framework is a large class library released by Microsoft that implements the base class library as well as additional functionality that isn t part of the ECMA standard. If you are using Visual Studio and targeting the CLR, you have access to the .NET Framework class libraries within your C++/CLI code. If you are using a different implementation of C++/CLI than Microsoft s, you still have the base class library. This book will not attempt to cover all that the .NET Framework, or even the base class library, allows you to do; however, it will cover basic input and output, the collection classes ( 11), some of the exceptions, some of the metadata that can be applied to types, and ways of getting information on types at runtime (reflection), all in 10, as well as other useful aspects of the Framework as necessary. The full .NET Framework contains support for database access, XML, web services, web pages, Windows application development, and so on.
QR Code ISO/IEC18004 Decoder In VS .NET
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Paint Barcode In Java
Using Barcode encoder for BIRT Control to generate, create Barcode image in BIRT reports applications.
www.OnBarcode.com
Barcode Decoder In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
www.OnBarcode.com
Barcode Creator In Objective-C
Using Barcode drawer for iPad Control to generate, create Barcode image in iPad applications.
www.OnBarcode.com
UPC-A Generation In None
Using Barcode printer for Online Control to generate, create Universal Product Code version A image in Online applications.
www.OnBarcode.com
Make UPC-A In VS .NET
Using Barcode creator for ASP.NET Control to generate, create UPCA image in ASP.NET applications.
www.OnBarcode.com
Barcode Recognizer In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
PDF417 Generation In .NET Framework
Using Barcode generation for Reporting Service Control to generate, create PDF-417 2d barcode image in Reporting Service applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.