On Saturday, 9 March 2019 at 20:04:53 UTC, Paul Backus wrote:

struct S
{
    bool isThisNull() { return &this is null; }
}

void main()
{
    import.std.stdio;
    S* p = null;
    writeln((*p).isThisNull); // true
}

Interactive version: https://run.dlang.io/is/fgT2rS

Anyway, thank you! I didn't know about the feature.

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