const ref Parameters

Explore how to use const ref parameters in D to maintain immutability when passing arguments to functions. Understand how this applies to structs and classes, enabling safe handling of immutable objects while preventing unauthorized modifications. This lesson also covers the difference between non-const and const member functions.

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This lesson is about how parameters and member functions are marked as const so that they can be used with immutable variables as well.

Although the examples in this lesson use only structs, const member functions also apply to classes.

`immutable` objects

You have already seen that it is not possible to modify immutable variables:

immutable readingTime = TimeOfDay(15, 0);

readingTime cannot be modified:

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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

const ref Parameters

`immutable` objects