Nested class:
A class defined within another class is a nested class.
Nested class' scope is within its enclosing class. Nested class name is not visible outside the enclosing class without qualifying it with enclosing class name. That is, enclosing_class_name::nested_class_name.
Example:
class Employee
{
public:
class Data
{
public:
int age;
int unique_id;
void display()
{ cout<<unique_id<< " " <<age; }
};
void printData( Data d)
{
d.unique_id=1;
d.display();
}
};
int main()
{
Employee jay;
Employee::Data d;
d.age=23;
jay.printData(d);
}
A class defined within another class is a nested class.
Nested class' scope is within its enclosing class. Nested class name is not visible outside the enclosing class without qualifying it with enclosing class name. That is, enclosing_class_name::nested_class_name.
Example:
class Employee
{
public:
class Data
{
public:
int age;
int unique_id;
void display()
{ cout<<unique_id<< " " <<age; }
};
void printData( Data d)
{
d.unique_id=1;
d.display();
}
};
int main()
{
Employee jay;
Employee::Data d;
d.age=23;
jay.printData(d);
}
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