Re: Struct immutable data and dict

[Timoses via Digitalmars-d-learn]

On Tuesday, 4 September 2018 at 12:27:47 UTC, nkm1 wrote:

I also had this problem recently. I think aa.require() should allow to add immutables (feature request). Anyway, my workaround was along the lines of:

final class AA(Key, Value)
{
    Value[] _storage;
    size_t[Key] _aa;

    void opIndexAssign(Value value, Key key)
    {
        if (key !in _aa)
        {
            _storage ~= value;
            _aa[key] = _storage.length - 1;
        }
    }

    Value opIndex(Key key)
    {
        if (auto index = key in _aa)
            return _storage[*index];

        throw new Exception("no key");
    }
}

immutable struct S
{
    int num;
}

void main()
{
    import std.stdio : writeln;

    auto aa = new AA!(string, S);

    aa["one"] = S(1);
    aa["two"] = S(2);

    writeln(aa["one"]);
    writeln(aa["two"]);
}

Thanks for the replies. It seems quite annoying.

I just use classes for now.