CODEWITHSUNDEEP
immutabilityd
blipman17
blipman17

Reputation: 531

Creating immutable properties without boilerplate

I am trying to make properties for immutable fields of structs in my program but I don't like the amount of boilerplate I need to get it working. I just want to make shure there is no shorter way.

struct Foo
{
    private immutable int[] bar_;
    @property immutable public immutable(int[]) bar() { return bar_;} 

    this(immutable int[] bar)
    {
        this.bar_ = bar;
    }
}

void main()
{
    immutable foo = Foo([0, 1, 2, 3, 4]);
    auto bar = foo.bar;
}

I would expect something like

private immutable int[] bar_;
@property public immutable(int[]) bar() { return bar_;}

or even in semi c# style 

public immutable int[] bar { get; }

The version I currently have seems like a lot of boilerplate and verry confusing. I hope there is a shorter way of writing a 'bar()' function that I'm just not aware of.

Upvotes: 1

Views: 110

Answers (1)

jpf
jpf

Reputation: 517

You could use the accessors library to generate the setters:

import accessors;

struct Foo
{
    @Read("public")
    private immutable int[] bar_;

    mixin(GenerateFieldAccessors);
}

However, as Adam said you usually don't need or want to use setter and getter properties for immutable fields.

Upvotes: 3

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