C++ Inline Functions

In C++, inline functions suggest the compiler to insert the function code directly at the point of call to reduce function call overhead. They are useful for small, frequently called functions.

1. Inline Function Syntax

The inline keyword is used before the function definition to request inline expansion.

inline return_type function_name(parameter_list) {
    // function body
}

2. Inline Function Example

This example demonstrates an inline function for addition.

#include <iostream>
using namespace std;

inline int add(int a, int b) {
    return a + b;
}

int main() {
    int sum = add(5, 3);
    cout << "Sum: " << sum << endl;
    return 0;
}

3. When to Use Inline Functions

Use inline functions for small, frequently called functions where reducing function call overhead is beneficial. Avoid using for large functions as it may increase code size.

4. Common Mistakes

Inline is only a request to the compiler; it may ignore it for large functions. Declaring large functions as inline can increase binary size and reduce efficiency.

Conclusion

C++ inline functions optimize small function calls by reducing overhead. They improve performance for frequently called simple functions but should be used judiciously to avoid code bloat.