C#•6mo ago

INumberBase<>.TryConvertFromTruncating()

I have a Bit type which wraps bool and implements INumberBase and IComparable. I need to implement the TryConvertFromTruncating method Should I just reimplement my FromSaturating method which returns Bit.One if the value is not zero, otherwise Bit.Zero? Or is there another better implementation. I do have int.CreateTruncating() in the body temporarily but this naturally creates unexpected limitations in the type The purpose of this type is just to test a case for my SSN type where it should throw if converting to a numeric type that doesn't support 0-9, and no such built in type satisfies this, but it is at least good practice for building an integral numeric type.

4 Replies

reflectronic•6mo ago

i mean, the implementation you "want" is basically n & 1 == 1 that truncates your n-bit value to a 1-bit value

Foxtrek_64OP•6mo ago

Doesn't look like INumberBase supports the & operator so value & TOther.One doesn't work

reflectronic•6mo ago

yes, because it has to be an IBinaryInteger

Foxtrek_64OP•6mo ago

Changed the base type of bit to be an IBinaryInteger because I felt it fit better Still trying to figure this one out though

static bool INumberBase<Bit>.TryConvertFromChecked<TOther>(TOther value, out Bit result)
{
    result = FromNumber(value);
    return true;
}

INumberBase<Bit>.TryConvertFromSaturating<TOther>(TOther value, out Bit result)
{
    result = value != TOther.Zero ? One : Zero;
    return true;
}

INumberBase<Bit>.TryConvertFromTruncating<TOther>(TOther value, out Bit result)
{
}

internal static Bit FromNumber<TNumber>(TNumber value)
    where TNumber : INumberBase<TNumber>
    => TryFromNumber(value, out Bit? result)
        ? result
        : ThrowOverflowException<Bit>();

internal static bool TryFromNumber<TNumber>(TNumber value, [NotNullWhen(true)] out Bit? result)
    where TNumber : INumberBase<TNumber>
{
    result = null;
    if (value == TNumber.Zero)
    {
        result = Zero;
        return true;
    }
    if (value == TNumber.One)
    {
        result = One;
        return true;
    }

    return false;
}

static bool INumberBase<Bit>.TryConvertFromChecked<TOther>(TOther value, out Bit result)
{
    result = FromNumber(value);
    return true;
}

INumberBase<Bit>.TryConvertFromSaturating<TOther>(TOther value, out Bit result)
{
    result = value != TOther.Zero ? One : Zero;
    return true;
}

INumberBase<Bit>.TryConvertFromTruncating<TOther>(TOther value, out Bit result)
{
}

internal static Bit FromNumber<TNumber>(TNumber value)
    where TNumber : INumberBase<TNumber>
    => TryFromNumber(value, out Bit? result)
        ? result
        : ThrowOverflowException<Bit>();

internal static bool TryFromNumber<TNumber>(TNumber value, [NotNullWhen(true)] out Bit? result)
    where TNumber : INumberBase<TNumber>
{
    result = null;
    if (value == TNumber.Zero)
    {
        result = Zero;
        return true;
    }
    if (value == TNumber.One)
    {
        result = One;
        return true;
    }

    return false;
}

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INumberBase<>.TryConvertFromTruncating()