C++ Overloaded Function Declaration: Understanding the Principles of Function Signature Reuse

Overloaded functions allow the creation of multiple functions with the same name but different parameter lists in the same scope, allowing for code reuse and flexibility: a function signature contains the function name and parameter list to uniquely identify the function. The parameter list can contain basic data types, class types, reference types, and pointer types. The compiler matches the best matching function signature based on the actual arguments. Return value types cannot be used for overloaded functions. Default parameters for functions cannot be used for overloaded functions. Different function signatures must yield different meanings.

C Declaration of overloaded functions: Understand the principle of function signature reuse

Overloaded functions allow creation of functions with Multiple functions with the same name but different parameter lists. This provides code reuse and increased flexibility.

The role of function signature

The function signature contains the name and parameter list of the function. It is used to uniquely identify a function and is used by the compiler to distinguish overloaded functions.

Overloaded function declaration syntax

type function_name(parameter_list);

The parameter list can contain basic data types, class types, reference types and pointer types.

Practical Case

Consider the following two functions that calculate the area of ​​a circle and a rectangle:

double area(double radius); // 圆形
double area(double width, double height); // 矩形

These two functions have different parameter lists, So it can be overloaded. Overloading allows us to choose an appropriate area calculation function based on the shape.

Calling overloaded functions

When an overloaded function is called, the compiler matches the best matching function signature based on the actual parameters. For example:

double radius = 5;
double areaCircle = area(radius); // 调用 area(double radius)

double width = 10, height = 5;
double areaRect = area(width, height); // 调用 area(double width, double height)

Note

• The return value type cannot be used for overloaded functions.
• The default parameters of a function cannot be used for overloaded functions.
• Different function signatures must produce different meanings.

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