C++ – Difference Between Functors and Functions
In C++, we have multiple options to operate over the data like in the case where we can use functions and functors. Although both seem to be similar in a few ways but have multiple differences between them. Let’s check the differences between functions and functors in C++.
What are functions?
Functions are pieces of code that can be called from any other part of a program. They are a way of organizing code so that it is reusable, and can be used to perform a specific set of operations. Functions can be defined in any programming language and are typically used to encapsulate a set of instructions that can be called multiple times.
What are functors?
Functors, also known as function objects, are objects that behave like functions. They are a type of object that can be treated like a function and can be used to encapsulate a set of instructions. They are similar to functions in that they can be used to encapsulate a set of operations, but they are different in that they can store states and can be used in more complex ways.
Difference between functions and functors
|Functors are objects that can be called like functions||Functions are blocks of code that can be called by their name|
|They can be created by defining the function call operator (operator())||They are created by declaring a function with a specific name and syntax|
|They can store state and retain data between function calls||Functions do not store state and do not retain data between calls|
|They can be overloaded and customized to perform different tasks||Functions cannot be overloaded and must have a fixed signature|
|They can be passed as arguments to other functions or returned as results||Functions can only be passed as arguments or returned as results|
|They can have different types of arguments and return values||Functions must have fixed types of arguments and return values|
|They are slower to execute than functions due to their added complexity||Functions are faster to execute due to their simplicity|
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