Re: How to check if value is null, today?

[jfondren via Digitalmars-d-learn]

On Thursday, 14 October 2021 at 11:58:29 UTC, tastyminerals wrote:

Here is an example code that doesn't work with the new compiler anymore:

```
if (someValue.isNull)
```

Attempting to run the above throws:
```

Error: incompatible types for `(0) : (someValue)`: `int` and `Nullable!int`

```

Do you have a complete example? Because this runs without error:

```d
import std.typecons : nullable, Nullable;
import std.stdio : writeln;

void main() {
    auto a = nullable(1);
    auto b = Nullable!int.init;
    if (!a.isNull)
        writeln(a.get);
    if (b.isNull)
        writeln("b is null");
}
```