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Anonymous classes in C++
Anonymous entity is anything that is defined without a name. A class with no name provided is known as an anonymous class in c++. An anonymous class is a special class with one basic property.
As there is no name given to the class there is no constructor allocated to it, though a destructor is there for deallocating the memory block.
The class cannot be used as an element of a function i.e. you cannot pass it as an argument or cannot accept values return from the function.
The syntax for defining an anonymous class in c++
class {
//data members
// member fucntions
}Some programming to illustrate the working of an anonymous class in c++.
Creating an anonymous class and defining and using its single objects −
We will define an anonymous class and declare its objects using which we will use the members of the class.
Example
#include <iostream>
using namespace std;
class{
int value;
public:
void setData(int i){
this->value = i;
}
void printvalues(){
cout<<"Value : "<<this->value<<endl;
}
}
obj1;
int main(){
obj1.setData(10);
obj1.printvalues();
return 0;
}Output
Value : 10
Creating an anonymous class and defining and using its two objects −
We can have multiple objects of an anonymous class and use them in our code. The below program show the working −
Example
#include <iostream>
using namespace std;
class{
int value;
public:
void setData(int i){
this->value = i;
}
void print(){
cout<<"Value : "<<this->value<<endl;
}
}
obj1,obj2;
int main(){
cout<<"Object 1 \n";
obj1.setData(10);
obj1.print();
cout<<"Object 2 \n";
obj1.setData(12);
obj1.print();
return 0;
}Output
Object 1 Value : 10 Object 2 Value : 12
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