C++ function overloading and function inlining

Function overloading and function inlining Function overloading allows the creation of multiple functions with the same name but different parameter lists, writing specific code for different input types. Function inlining is a compiler optimization that inserts function code directly into the call point to improve program speed.

C Function Overloading and Function Inlining

Function Overloading

Function Overloading allows you to create Multiple functions with the same name but different parameter lists. This allows you to write target-specific code based on different types or amounts of input.

Syntax:

returnType functionName(parameter1, parameter2, ...);
returnType functionName(parameter1, parameter2, ..., parameterN);

Example:

int sum(int a, int b) { return a + b; }
double sum(double a, double b) { return a + b; }

Function inline

Function inlining is a compiler optimization technique that inserts function code directly into the call site (rather than jumping to the function through a function call). This can improve the speed of your program, especially if the function is called frequently.

Grammar:

For functions:

inline returnType functionName(parameter1, parameter2, ...);

For member functions:

inline returnType className::memberFunctionName(parameter1, parameter2, ...);

Actual cases:

Suppose you want to calculate the area of ​​different shapes. You can use function overloading to create specific area calculation functions for each shape.

Example:

#include <iostream>

using namespace std;

double area(int radius) {
  return 3.14 * radius * radius;
}

double area(int length, int width) {
  return length * width;
}

double area(int base, int height) {
  return 0.5 * base * height;
}

int main() {
  cout << "圆的面积： " << area(5) << endl;
  cout << "矩形的面积： " << area(4, 7) << endl;
  cout << "三角形的面积： " << area(3, 6) << endl;
}

By using function inlining, the efficiency of the program can be further improved:

#include <iostream>

using namespace std;

inline double area(int radius) {
  return 3.14 * radius * radius;
}

inline double area(int length, int width) {
  return length * width;
}

inline double area(int base, int height) {
  return 0.5 * base * height;
}

int main() {
  cout << "圆的面积： " << area(5) << endl;
  cout << "矩形的面积： " << area(4, 7) << endl;
  cout << "三角形的面积： " << area(3, 6) << endl;
}

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