Comparator class declaration

#1

Sir,I didn’t understand the declaration statement properly,
why there is two sets of brackets like
bool operator()()
please mention If I am forgetting something from C++ basics
Thank you sir

#2

this is operator overloading.
for eg.

  1. the function prototype for addition operator overloading would be:
    bool operator+(){
    }

  2. the function prototype for parenthesis operator overloading would be:
    bool operator()(){
    }

thanks

#3

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