C#•4mo ago

How do you declare an Array's Count property to be consistent within a Struct?

I'd like to make a struct with one of its variables being an array that's a consistent size, even if not all data points within that array are filled.

public struct Location
{
public string ID { get; set; }
public float[] Values { get; set; }
}

public struct Location
{
public string ID { get; set; }
public float[] Values { get; set; }
}

I would like my Values[]'s count property to be consistent, but I can't find a way to set that within the struct (say, all Locations will have an array of 10 Values). How could I do that?

12 Replies

Angius•4mo ago

In the constructor

Jimmacle•4mo ago

make it get-only and initialize it in the constructor

Angius•4mo ago

public struct Location
{
    public string ID { get; set; }
    public float[] Values { get; }

    public Location(int size)
    {
        Values = new[size];
    }
}

public struct Location
{
    public string ID { get; set; }
    public float[] Values { get; }

    public Location(int size)
    {
        Values = new[size];
    }
}

should do the trick

Marvin•4mo ago

i think you need new float[size]; at that scenario no?

MODiX•4mo ago

Angius

REPL Result: Failure

public struct Location
{
    public float[] Values { get; }

    public Location(int size)
    {
        Values = new[size];
    }
}

var l = new Location(69);

public struct Location
{
    public float[] Values { get; }

    public Location(int size)
    {
        Values = new[size];
    }
}

var l = new Location(69);

Exception: CompilationErrorException

- Invalid rank specifier: expected ',' or ']'
- { expected
- } expected
- No best type found for implicitly-typed array

- Invalid rank specifier: expected ',' or ']'
- { expected
- } expected
- No best type found for implicitly-typed array

Compile: 396.738ms | Execution: 0.000ms | React with ❌ to remove this embed.

Angius•4mo ago

ye I guess the new[] doesn't work quite everywhere, mb

NurgliniOP•4mo ago

Well, I still want to be able to set the Values, wouldn't this disallow that?

Angius•4mo ago

It will prevent you from overriding the array. Say, doing loc.Values = new float[89267](); It will still let you set individual values, like loc.Values[4] = 420.69f;

NurgliniOP•4mo ago

Mmm, but I could still do loc.Value[1] = n, kk, sweet

SleepWellPupper•4mo ago

Also, if you're new to C#, avoid using mutable structs, they can be a cause of great pain and suffering. Mutable structs are evil (generally)

Jimmacle•4mo ago

also, a struct with reference type members will work unexpectedly e.g. if you copy that struct, all copies will reference the same array

Marvin•4mo ago

yea that really took me off-guard when getting started back in the years

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How do you declare an Array's Count property to be consistent within a Struct?