What Does the `const` Keyword Mean in C Member Functions?

Member Functions with the 'const' Keyword: What It Means

When you encounter the 'const' keyword at the tail end of a member function (after the argument list), it implies a specific characteristic of the function. The 'const' keyword in this context signifies that the 'this' pointer, which represents the instance of the class the function is invoked upon, is treated as a constant within the function's scope. Consequently, the member function is prohibited from modifying the object's data members.

This distinction is crucial because it determines the constraints on the usage of the member function. A const member function can be invoked on both non-constant and constant objects, whereas a non-const member function is only applicable to non-constant objects. This is due to the fact that a non-const member function could potentially alter the object, which would be a violation if the object is constant.

In summary, the 'const' keyword at the end of a member function enforces immutability on the object instance within the function's scope, providing a safeguard against unintended modifications. This allows for greater flexibility in object manipulation and ensures that constant objects remain unaltered during member function invocations.

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