Re: Associative Array, get value instead of poiter using `if (auto ..)`, possible?

[kdevel via Digitalmars-d-learn]

On Saturday, 31 August 2024 at 14:25:29 UTC, Paul Backus wrote:

[...]

Once the next release of Phobos comes out, with [PR 9039][1] merged, you'll be able to do it like this:

```d
import std.typecons;

Nullable!V maybeGet(K, V)(V[K] aa, K key)
{
    if (auto ptr = key in aa)
        return nullable(*ptr);
    else
        return Nullable!V.init;
}

void main()
{
    import std.stdio;

    int[string] test = ["hello": 42];

    if (auto it = test.maybeGet("hello"))
    {
        writeln("hello => ", it.get);
    }
}
```

Is that functionally different from

```
void main()
{
    import std.stdio;

    int[string] test = ["hello": 42];

    if (auto p = "hello" in test)
    {
        writeln("hello => ", *p);
    }
}
```

?