On Wednesday, 22 August 2018 at 13:50:07 UTC, Andrey wrote:
Hello,
How to test if variable has void value?
string text = void;
if(text == void)
{
writeln("Is void");
}
Tried this:
if(is(text == void))
but doesn't work.
You can't. When using a void initializer the actual value is
garbage until initialized properly, and that garbage can look
like anything including a valid instance.
So if the flow of your program can't guarantee that the value has
been initialized at a certain point, you'll have to track it
yourself some way. Nullable may be of help:
https://dlang.org/phobos/std_typecons.html#Nullable
