What is an abstract function in D?
Chinweuba Elijah AzubuikeWhat is a function?
Functions are code blocks that carry out certain instructions in an application. These blocks of code can be called multiple times during the runtime of the application. These blocks of code are reusable.
What is an abstract function?
Abstract functions are instantiated in a derived class but declared in a base class. Let’s see an example.
Example
import std.stdio;
import std.string;
import std.datetime;
abstract class Person {
int dob;
string name;
//abstract class
abstract void print();
}
class Employee : Person {
int empID;
override void print() {
writeln("The employee details are as follows:");
writeln("Emp ID: ", this.empID);
writeln("Emp Name: ", this.name);
writeln("Date of Borth: ", this.dob);
}
}
void main() {
Employee emp = new Employee();
emp.empID = 101;
emp.dob = 1980;
emp.name = "Emp1";
emp.print();
}Note: Please read this shot to learn about inheritance in D. You’ll learn about what goes on in the code example aside from the abstract function we’re looking at in this shot.
Explanation
-
Line 9: We declare our function. The
abstractkeyword shows that this function is an abstract function. Also, observe that we only create the function. We do not write anything in it. -
Line 11: We inherit the
Personclass that allows us to access theabstractfunction. -
Lines 14-20: We define the properties of the
print()function inEmployeeclass. -
Line 24: We create an
Employeeclass instance. -
Line 29: We call the
print()function on the created instance to print its features. Theprint()function prints the details of the employee.
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Chinweuba Elijah AzubuikeView all Courses
