What are the implications of using '= delete' in C function declarations?

Understanding the Implications of "= delete" in Function Declarations

In C , the syntax "= delete" appended to a function declaration implies an important concept known as function deletion. Introduced in C 11, this mechanism allows developers to explicitly remove certain functions from the class interface, prohibiting their usage.

Purpose of "= delete"

Primarily, "= delete" is employed to:

1. Prevent copying: By adding "= delete" to a copy constructor and/or copy assignment operator, you effectively prohibit creating copies or making assignments from objects of that class.
2. Avoid unintended conversions: Appending "= delete" to conversion constructors or other functions that accept specific parameter types prevents implicit conversions from occurring.

Other "Modifiers"

In addition to "= delete", C provides several other modifiers that can be used with function declarations:

1. "= 0": This syntax indicates a pure virtual function, requiring any derived classes to implement it.
2. "const": Declares the function as const, preventing any modifications to the object's member variables within the function.
3. "virtual": Specifies that the function can be overridden in derived classes, providing polymorphic behavior.
4. "override": Confirms that a function overrides the corresponding virtual function in the base class.

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