How to Create a Comparator in C++?
In C++, we can create a comparator function using four methods. They are:
- Using Function Pointer
- Using Lambda Expression
- Using Functors
Comparator in C++
In C++, a comparator is a function or a function (an object that acts like a function) that is used to compare elements. It is widely used in sorting algorithms or in data structures like std::sort or std::priority_queue to define custom sorting orders. It can be used to define specific rules for comparing elements, influencing the order in which they appear.
The comparator function generally takes two parameters (values to compare) and returns a boolean value based on their comparison. Such functions are also called binary predicate. Although, there is no limitation on the number or parameters the comparator function can take.
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