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private static T Sum<T>(T num) where T : struct { T sum = default(T) ; for (T n = default(T) ; n < num ; n++) sum += n; return sum; }
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I ve done everything possible to try to get this method to compile . I ve constrained T to struct, and I m using default(T) to initialize sum and n to 0 . But when I compile this code, I get the following three errors:
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error CS0019: Operator '<' cannot be applied to operands of type 'T' and 'T'
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error CS0023: Operator '++' cannot be applied to operand of type 'T' error CS0019: Operator '+=' cannot be applied to operands of type 'T' and 'T'
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This is a severe limitation on the CLR s generic support, and many developers (especially in the scientific, financial, and mathematical world) are very disappointed by this limitation . Many people have tried to come up with techniques to work around this limitation by using reflection (see 23, Assembly Loading and Reflection ), operator overloading, and so on . But all of these cause a severe performance penalty or hurt readability of the code substantially . Hopefully, this is an area that Microsoft will address in a future version of the CLR and the compilers .
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13
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Interfaces
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In this chapter: Class and Interface Inheritance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Defining an Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inheriting an Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . More About Calling Interface Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Implicit and Explicit Interface Method Implementations (What s Happening Behind the Scenes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Generic Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Generics and Interface Constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Implementing Multiple Interfaces That Have the Same Method Name and Signature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Improving Compile-Time Type Safety with Explicit Interface Method Implementations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Be Careful with Explicit Interface Method Implementations . . . . . . . . . . . . . . . . Design: Base Class or Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308 308 310 312 314 315 318 319 320 322 325
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Many programmers are familiar with the concept of multiple inheritance: the ability to define a class that is derived from two or more base classes . For example, imagine a class named TransmitData, whose function is to transmit data, and another class named ReceiveData, whose function is to receive data . Now imagine that you want to create a class named SocketPort, whose function is to transmit and receive data . In order to accomplish this, you would want to derive SocketPort from both TransmitData and ReceiveData . Some programming languages allow multiple inheritance, making it possible for the SocketPort class to be derived from the two base classes, TransmitData and ReceiveData . However, the common language runtime (CLR) and therefore all managed programming languages does not support multiple inheritance . Rather than not offer any kind of multiple inheritance at all, the CLR does offer scaled-down multiple inheritance via interfaces . This chapter will discuss how to define and use interfaces as well as provide some guidelines to help you determine when to use an interface rather than a base class .
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