What are the requirements for function signatures in C++ function overloading?

Function overloading requires different function signatures, including the following aspects: different return types, different parameter lists (total number of parameters, type, order) The first parameter type of template function overloading must be different

C Function signature requirements in function overloading

Function overloading allows the programmer to create multiple functions with different parameter lists using the same name. Function signature plays a key role in determining whether a function is overloaded or not.

Requirements for function signature:

• Different return types: Overloaded functions can have different return types. For example, a function that returns an int can be overloaded into a function that returns a double.

• Different parameter lists: Overloaded functions must have different parameter lists. The parameter list can vary including:

  • Total number of parameters
  • Type of parameters
  • Order of parameters
• ##The first parameter is different (for template function overloading): For overloaded functions that use templates, the first parameter type of the overloaded version must be different. This ensures that the function is instantiated using the correct template.

Practical case:

Consider the following example of calculating the area of ​​a rectangle and the area of ​​a circle:

#include <iostream>

using namespace std;

// 计算矩形的面积
double area(double width, double height) {
  return width * height;
}

// 计算圆形的面积
double area(double radius) {
  return 3.14 * radius * radius;
}

int main() {
  double rectWidth = 5.0;
  double rectHeight = 6.0;
  double circleRadius = 3.0;

  cout << "矩形的面积：" << area(rectWidth, rectHeight) << endl;
  cout << "圆形的面积：" << area(circleRadius) << endl;

  return 0;
}

In this example,

area The function is overloaded twice, once for rectangles and once for circles. They have different parameter lists and therefore meet the requirements of function overloading.

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