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How to Mimic Java Static Blocks in C : Initialization Strategies and Considerations

Susan Sarandon
Release: 2024-10-27 09:16:03
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How to Mimic Java Static Blocks in C  : Initialization Strategies and Considerations

C Equivalents to Java Static Blocks

In Java, static blocks provide a convenient way to initialize static members before the class is instantiated. However, C does not have static blocks within classes.

Option 1: Initialization at Process Load

To achieve initialization at process load, use static variables outside of any class, also known as "translation unit scope."

<code class="cpp">// translation-unit-scope-static-initialization.cpp
static_block {
    // Code to initialize your static variables
}</code>
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Option 2: Initialization at Class Instantiation

As C does not allow initialization of non-const static members, we need an indirect approach. Here's a workaround:

<code class="cpp">// static-initialized-via-base-class.cpp
class StaticInitialized {
public:
    static bool staticsInitialized = false;
    virtual void initializeStatics() = 0; 
};
​
class MyClass : private StaticInitialized {
    static int field1;
    static int field2;
​
private:
    void initializeStatics() override {
        // Code to initialize field1 and field2
    }
};</code>
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One caveat is that both options do not guarantee the order of initialization, as static variable initialization order in C is not deterministic.

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