Postblit

Explore the concept of postblit in D programming to understand how object copying works beyond simple bit-wise copying. Learn to properly implement postblit functions to handle reference types like slices, ensuring each copied object has its own independent data. Understand how to disable postblit to prevent copying when necessary.

We'll cover the following...

- What is “postblit”?
- Disabling postblit

What is “postblit”?

Copying is constructing a new object from an existing one. Copying involves two steps:

Copying the members of the existing object to the new object bit-by-bit. This step is called blit, short for block transfer.
The second step is making further adjustments to the new object after the block transfer. This step is called postblit.

The first step is handled automatically by the compiler, which copies the members of the existing object to the members of the new object:

auto returnTripDuration = tripDuration; // copying

Do not confuse ...

1.Introduction

2.Lifetimes, null Value and the is Operator

3.Type Conversions

4.Structs

5.Variable Number of Parameters

6.Function Overloading and Member Functions

7.Constructor and Other Special Functions

8.Operator Overloading

9.Introduction to Classes

10.Inheritance

11.The Object Class

12.Interfaces

13.destroy and scoped

14.Modules and Libraries

15.Encapsulation and Protection Attributes

16.UFCS, Properties and Contract Programming

17.Templates

18.Pragmas, alias and with

19.Pointers

20.Bit Operations

21.Conditional Compilation

22.Function Pointers, Delegates, and Lambdas

23.foreach with Structs and Classes

24.Unions, Labels, goto and Tuples

25.More Templates

26.More Functions

27.Mixins

28.Ranges

29.static foreach and Parallelism

30.Message Passing Concurrency

31.Data Sharing Concurrency

32.Fibers

33.Memory Management

34.User Defined Attributes (UDA) and Operator Precedence

35.Conclusion

Postblit

What is “postblit”?