How Can I Efficiently Share Global Variables Across Multiple Source Files?

Accessing Global Variables Across Multiple Source Files

In the given scenario, you have two source files that require access to a shared variable named global. Determining the most efficient way to achieve this is crucial.

The solution lies in declaring global as extern within a header file that both source files include. This approach ensures that the variable is visible to all source files but defined in only one.

In the header file (common.h):

extern int global;

In source1.cpp:

#include "common.h"

int global; // Define global in only one source file

int function();

int main() {
    global = 42;
    function();
    return 0;
}

In source2.cpp:

#include "common.h"

int function() {
    if (global == 42)
        return 42;
    return 0;
}

By utilizing this approach, both source1.cpp and source2.cpp can access the shared variable global without creating compilation errors or unexpected behavior.

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