When and Why Should You Use Proxy Classes in C ?

Understanding Proxy Classes in C : Concepts and Applications

In C , a proxy class serves as an intermediary between a client and a real object or service. It acts as a representative, providing an alternative interface to simplify or enhance communication and accessibility.

Rationale for Proxy Class Creation

Creating a proxy class offers several benefits:

• Hiding implementation details: It allows for encapsulation and protection of the underlying object's implementation, isolating clients from complex or sensitive internal mechanisms.
• Controlling access: Proxy classes can be used to restrict access to specific operations or resources, enforcing security and data integrity measures.
• Optimizing performance: They can act as a caching or optimization layer, reducing the cost of frequent object creation or resource consumption.

Application Scenarios

Proxy classes find applications in various programming scenarios, including:

Example: Binary Digit Array

As illustrated in the example provided, a proxy class can be used to create an array of binary digits (0 or 1), ensuring data integrity and handling:

struct aproxy {
    // ...
};

struct array {
    // ...
    aproxy operator[](int i) {
        return aproxy(mArray[i]);
    }
};

In this case, the proxy class (aproxy) manages access to the binary array, restricting the range of values that can be stored and throwing an exception if an invalid value is attempted.

Proxy classes provide versatile means for controlling access, optimizing performance, and enhancing the functionality of objects in C applications.

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