Functions Declarations for previouskey and insert

What are the function declarations for the member functions previouskey and insert in the given code snippet?

The function declaration for the member function previouskey is:
const key previouskey(const key & k) const
It takes a constant reference to an object of type key as a parameter and returns a constant reference to an object of type key.

The function declaration for the member function insert is:
bool insert(const key & k, const value & v)
It takes two constant references as parameters - one to an object of type key and another to an object of type value. It returns a bool value indicating whether the insertion was successful or not.

Function Declarations in the Code Snippet:

In the provided code snippet, there are function declarations for two member functions - previouskey and insert.

Previouskey Function:

The previouskey function is declared with the signature const key previouskey(const key & k) const. This function takes a constant reference to an object of type key as a parameter. When this function is called with a key object as an argument, it returns a constant reference to another key object.

Insert Function:

The insert function is declared with the signature bool insert(const key & k, const value & v). This function takes two constant reference parameters - one of type key and another of type value. Upon execution, the insert function attempts to insert the key-value pair into a data structure. If the insertion is successful, it returns a boolean value of true. Otherwise, it returns false.
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