On Monday, 27 August 2018 at 03:21:04 UTC, rikki cattermole wrote:
Templates make it the easiest way, since common patterns, like
arrays, classes and pointers have the exact same null check
syntax.
I see.
That code is only for classes. C# also has structs which are a
value type. Which it would not work for.
The same thing for struct in C#
Struct S{
public int? i;
}
S.i == null; // This works nicely.
You don't need isNull function for Nullable because it has a
method called it. That will be preferred (hence I specifically
used isNull as the name).
For Variant, use hasValue.
bool isNull(Variant value) {
return !value.hasValue;
}
The problem I'm trying to solve is beyond that. This is just an
example. But bear with me, right now all I want is a function to
check the value from 'a' type and return if it is null.
The type could be a: Class, Struct, a Basic data type, Variant,
Nullable and so.
And what I see, these types has different behaviors, while in C#
at least for this same case, I would write the same thing in few
lines to perform it, in D I found very hard.
Isn't counter intuitive the way D works? Because for each type
Class/Nullable you check with .isNull, for Variant with
.hasValue, for string (variable is null).
Thanks.
