Inline Function in C++

Inline Function in C++

 

Definition:

An inline function is a function that is expanded in line when it is invoked. Inline expansion
makes a program run faster because the overhead of a function call and return is eliminated. It
is defined by using key word “inline”.

C++ provides inline functions to reduce the function call overhead. An inline function is a function that is expanded in line when it is called. When the inline function is called whole code of the inline function gets inserted or substituted at the point of the inline function call. This substitution is performed by the C++ compiler at compile time. An inline function may increase efficiency if it is small.

SYNTAX :

inline return-type function-name(parameters) 
{ 
// function code 
}

CODE :

#include <iostream>
using namespace std;

inline void displayNum(int num) {
    cout << num << endl;
}

int main() {
    // first function call
    displayNum(5);

    // second function call
    displayNum(8);

    // third function call
    displayNum(666);

    return 0;
}

Properties of inline function:

1.Inline function sends request but not a command to compiler
2.Compiler my serve or ignore the request
3.if function has too many lines of code or if it has complicated logic then it is executed as
normal function .

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