How to Separate C Class Declarations from Member Function Implementations?

Separating Class Declarations from Member Functions in C Header and Source Files

In software engineering, it is essential to decouple class declarations from their member function implementations. This facilitates modularity, code reusability, and maintainability. Let us delve into how to achieve this separation effectively.

Class Declaration

The class declaration contains the class name, member variable declarations, and zero-argument constructor. In the header file (e.g., A2DD.h), the declarations take the following form:

// A2DD.h

#ifndef A2DD_H
#define A2DD_H

class A2DD {
public:
  A2DD();
  // Member variable and method declarations
};

#endif // A2DD_H

Notice the use of include guards (#ifndef and #define) to prevent multiple inclusions.

Member Function Implementation

Member function implementations are defined in the source file (e.g., A2DD.cpp). For instance, the implementation for the A2DD class might look like this:

// A2DD.cpp
#include "A2DD.h"

A2DD::A2DD() { // Zero-argument constructor implementation }
// Other member function implementations

Using the Header and Source Files

To use the separated class declarations and implementations, include the header file in other source files. For example, in main.cpp:

#include "A2DD.h"

int main() {
  A2DD obj;
  return 0;
}

This approach allows you to separate the interface (header file) from the implementation (source file), making code management and modifications more efficient.

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