Web Reference: May 21, 2025 · A function object is any object for which the function call operator is defined. C++ provides many built-in function objects as well as support for creation and manipulation of new function objects. A function object, or functor, is any type that implements operator(). This operator is referred to as the call operator or sometimes the application operator. The C++ Standard Library uses function objects primarily as sorting criteria for containers and in algorithms. 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:
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