


Handling of references and pointers in C++ function overloading and rewriting
When a function is overloaded, a reference or pointer is passed, and all functions must use the same type of data. When a function is rewritten, for reference member functions, the subclass function must refer to the same type of variable; for pointing to member functions, the subclass function must point to the same type of variable.
Handling of references and pointers in C function overloading and rewriting
Function overloading
Function overloading is allowed in the same role Create multiple functions within a domain with the same name but different parameter lists. For references and pointers, we need to pay attention to the following points:
-
When passing references, all functions must refer to the same type of data:
1
2
void
print
(
const
int& num);
void
print
(
const
double& d);
Copy after login When passing pointers, all functions must point to the same type of data:
1
2
void
print
(int* num);
void
print
(double* d);
Copy after login
Function override
Function override Is to implement a function in the parent class with the same name and parameter list in the subclass. For references and pointers, we need to pay attention:
For reference member functions, the subclass function must refer to the same type of variable:
1
2
3
4
5
6
7
8
9
class
Parent {
public
:
void setAge(
const
int& age);
};
class
Child :
public
Parent {
public
:
void setAge(
const
int& age) override;
// 同一类型引用
};
Copy after loginFor pointing to member functions, subclass functions must point to variables of the same type:
1
2
3
4
5
6
7
8
9
class
Parent {
public
:
int* getPtr();
};
class
Child :
public
Parent {
public
:
int* getPtr() override;
// 同一类型指针
};
Copy after login
Practical case
Assume we have A Person
class that represents a person's age and name. There are two member functions in this class: setAge(const int& age)
and setName(const string& name)
.
We create a subclass Employee
, inherit from the Person
class, and override the setAge
function to set the age to Add 5 to it before age
.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
|
Now, we can create an Employee
object and use the overridden setAge
function:
1 2 |
|
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