Re: Why does templated interface function return something different than final function?

[Timoses via Digitalmars-d-learn]

On Thursday, 2 August 2018 at 20:35:57 UTC, Steven Schveighoffer 
wrote:

Looking at the AST, it appears that toImpl doesn't recognize 
what inout(iface) is:

toImpl!(string, inout(iface))
{
        @system string toImpl(ref inout(iface) value)
        {
                import std.array : appender;
                import std.format : FormatSpec, formatValue;
                Appender!string w = appender();
                FormatSpec!char f = FormatSpec;
                formatValue(w, value, f);
                return w.data();
        }

}

Vs. the nice neat call for const(iface)

toImpl!(string, const(iface))
{
        @system string toImpl(const(iface) value)
        {
                return toStr(value);
        }

}

Note the ref there, too. This means it can't cast to const. I 
wonder if that's an issue.

-Steve

Thanks for the insight. To me it sounds like std.conv `toImpl` 
doesn't properly handle inout types in this case.