C++ only(otherwise don't answer please)

HASHING(DATA STRUCTURES)

QUESTION:

implement an hash map class that stores student roll numbers and their cgpas. Roll number will be the key and in the form of a string, i.e., 19L-1111. Cgpa will be the value and in the form of a float.

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You will need to define the following wrapper struct/class for storing roll numbers and using them as keys in the hash map class. struct WrapperString { string stringVal; int hashCode() { //use a polynomial hash function to find the hash code of the string in stringVal; } }

N.B So the hash map object will be: HashMap;.

NOTE:

DO DISPLAY THE OUTPUT OF A RUNNING PROGRAM

ADD COMMENTS FOR BETTER UNDERSTANDING OF SOLUTION

implement the given task in c++