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Interfaces are a critical extension of object-oriented programming They provide functionality similar to abstract classes but without using up the single-inheritance option, while constantly supporting derivation from multiple interfaces In C#, the implementation of interfaces can be either explicit or implicit, depending on whether the implementing class is to expose an interface
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member directly or only via a conversion to the interface Furthermore, the granularity of whether the implementation is explicit or implicit is at the member level: One member may be implicit while another on the same interface is explicit The next chapter looks at value types and discusses the importance of defining custom value types; at the same time, the chapter points out the subtle foibles that they can introduce
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throughout this book This chapter discusses not only using value types, but also defining custom value types There are two categories of value types The first category is structs This chapter discusses how structs enable programmers to define new value types that behave very similarly to most of the predefined types discussed in 2 The key is that any newly defined value types have their own custom data and methods The second category of value types is enums This chapter discusses how to use enums to define sets of constant values
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OU HAVE USED VALUE TYPES
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Structs Initializing Structs
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BEGINNER TOPIC Categories of Types All types discussed so far fall into two categories: reference types and value types The differences between the types in each category stem from differences in copying strategies, which in turn results in each type being stored differently in memory To review, this Beginner Topic reintroduces the value type/reference type discussion to familiarize those who are unfamiliar with it
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Value types directly contain their values, as shown in Figure 81 The variable name equates to the location in memory where the value is stored Because of this, when a different variable is assigned the original variable, a memory copy of the original variable s value is made to the location of the new variable A second variable of the same value type cannot refer to the same location in memory as the first variable (again assuming no out or ref parameter) So, changing the value of the first variable will not affect the value in the second variable, since value types equate to a specific location in memory Consequently, changing the value of one value type cannot affect the value of any other value type Similarly, passing a value type to a method such as ConsoleWriteLine() will also result in a memory copy, and any changes to the parameter value inside the method will not affect the original value within the calling function Since value types require a memory copy, they generally should be defined to consume a small amount of memory (less than 16 bytes approximately)
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int number1 char letter float pi int number2
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42 'A' 314F 42 Stack
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Figure 81: Value Types Contain the Data Directly
Structs
The amount of memory that is required for the value type is fixed at compile time and will not change at runtime This fixed size allows value types to be stored in the area of memory known as the stack
Reference Types
In contrast, reference types and the variables that refer to them point to the data storage location (see Figure 82) Reference types store the reference (memory address) where the data is located, instead of representing the data directly Therefore, to access the data, the runtime will read the memory location out of the variable and then dereference it to reach the location in memory that contains the data The memory area of the data a reference type points to is the heap