Advantages of C++ inline functions in improving code execution efficiency

Inline functions improve execution efficiency by directly embedding code: Declaration: Use the keyword inline to declare inline functions. Advantages: Improve execution efficiency, reduce code size, and improve readability. Practical case: Use inline functions to optimize functions that calculate the square of array elements, eliminate calling overhead, and improve execution efficiency.

C Inline function: Improve code execution efficiency

Inline function is a special function whose code is directly embedded to the function call point. By eliminating the overhead of function calls, it can significantly improve code execution efficiency.

How to declare an inline function

In C, use the keyword inline to declare an inline function:

inline int square(int x) {
    return x * x;
}

Advantages of inline functions

• Improve execution efficiency: Inline functions do not require calling and returning, thus eliminating related overhead, thereby speeding up function execution.
• Reduce code size: Because the code of the inline function is directly embedded in the call point, a separate function body is not generated in the assembly code, thereby reducing the code size of the executable file.
• Improve readability: The code of the inline function is located directly at the call point, making the code logic clearer and easier to understand.

Practical case

Suppose we have a function that calculates the square of array elements:

int* squareArray(int* arr, int size) {
    int* squaredArr = new int[size];
    for (int i = 0; i < size; i++) {
        squaredArr[i] = arr[i] * arr[i];
    }
    return squaredArr;
}

Using inline functions, we can optimize this Function:

inline int square(int x) {
    return x * x;
}

int* squareArray(int* arr, int size) {
    int* squaredArr = new int[size];
    for (int i = 0; i < size; i++) {
        squaredArr[i] = square(arr[i]);
    }
    return squaredArr;
}

By inlining the square function, we eliminate the overhead of calling square, thus improving the execution efficiency of the squareArray function .

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