How Does "= delete" Prevent Function or Constructor Usage in C ?

Deletion of Functions in C with = delete

C introduces the "= delete" syntax, which allows developers to explicitly prohibit certain functions or constructors from being used. This is achieved by appending "= delete" to the function or constructor declaration within a class.

Consider the following example:

class my_class
{
    ...
    my_class(my_class const &) = delete;
    ...
};

Meaning of = delete

In the context of function or constructor declarations, "= delete" serves the following purpose:

• It prevents the compiler from generating a copy constructor or copy assignment operator for that specific function or constructor.
• It can be used to restrict specific constructors' usage to prevent unintended copying or assignment operations.

Additional Modifiers

Apart from "= delete," there are no other modifiers in C that serve the same purpose of explicitly preventing function or constructor usage. However, it's worth noting that "= 0" (the default constructor definition in C ) and "= default" (introduced in C 11) can be used to provide default implementations for constructors and member functions if not explicitly defined in the class.

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