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Deciding Between const and const References in Function Arguments

When developing C functions with arguments, it is crucial to use const judiciously to ensure data integrity. Typically, const is employed when an object remains immutable within the function scope or when a pointer's value should not be altered.

Additional Considerations for Const Usage

• Hiding Implementation Details: When passing an object via const reference, it becomes an implementation detail if the function makes any copies of the object internally.
• Enhancing Readability: Utilizing const references clarifies that the function will not alter the passed parameter, improving code readability.
• Preventing Unintentional Modifications: Const references prevent accidental object modifications, eliminating the potential for unexpected side effects.

Const Reference vs. Pointer

Const references are superior to pointers in the following situations:

• When the argument must be a non-null object, as pointers allow for null values.
• When overloading operators, as pointers cannot be used.

When Const is Essential

• Preventing Object Modification: Const reference is crucial when the function should not modify the object (e.g., void ReadonlyFunction(const MyClass& obj))
• Optional Parameters with Default Values: Const pointers allow optional parameters with default values (e.g., void OptionalFunction(const MyClass* obj = nullptr))

Const by Value

While const may appear in function declarations with value parameters, it has no practical effect. The function's implementation determines whether an internal copy is made or not.

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