Hash function for custom class

#1

In class hashfn why we have overloaded the operator()
basic code:-

size_t operator()(const student &s)const{

}

#2

hello @shashankmaheshwari054
we cant hash user defined class directly in map without defining the hash function because compiler dont know how to hash user defined classes.

thats why its user responsibility to write functor and feed logic of hashfunction inside it and then pass it as third argument of map

#3

why are we writing the const in the function

#4

we dont want this function to make any change with the passed object thats why const

#5

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