Web Reference: Jul 23, 2025 · Functors are objects that can be treated as though they are a function or function pointer. Functors are most commonly used along with STLs in a scenario like following: Jun 29, 2018 · Like others have mentioned, a functor is an object that acts like a function, i.e. it overloads the function call operator. Functors are commonly used in STL algorithms. This example illustrates using function objects to write a generic sort function, which can sort strings by various criteria, without having to write the same sort algorithm over and over and over.
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