How to Implement Static Code Blocks in C Without Using Classes?

Static Code Blocks in C : An Alternative Approach Outside Classes

While C does not directly support static code blocks within classes, a workaround is to utilize static code blocks outside classes. This approach allows for the execution of code during class loading or when the containing DLL is loaded.

Option 1: Initialization During Process Load/DLL Load

To accomplish this, you can create a static block at translation unit scope, typically in the implementation file for your class. For example:

<code class="cpp">static_block {
    // Here you can perform initialization code
    std::cout << "Hello static block world!\n";
}</code>

By using static_block as shown above, the enclosed code will run before the main() function.

Option 2: Initialization During First Class Instantiation

For this option, consider the following class structure:

<code class="cpp">class StaticInitialized {
public:
    static bool staticsInitialized = false;
    virtual void initializeStatics();

    StaticInitialized() {
        if (!staticsInitialized) {
            initializeStatics();
            staticsInitialized = true;
        }
    }
};

class MyClass : private StaticInitialized {
public:
    static int field1;
    static int field2;

protected:
    void initializeStatics() {
        // Here you can perform initialization code specific to MyClass
        field1 = 42;
        field2 = 100;
    }
};</code>

In this example, the initializeStatics() function is virtual and can be overridden in derived classes for specific initialization logic. The StaticsInitialized flag ensures that the initialization code is only run once before any instance of the class is created.

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