Besides this, I tried something with types used as user defined
attributes.
https://dlang.org/spec/attribute.html#uda
Automatic compile time tagging is not my speciality, however, I
think is also achievable with mixins somehow?
But I don't know how to workaround the bug
https://issues.dlang.org/show_bug.cgi?id=18718
at this moment...
https://run.dlang.io/is/DmBhO5
Does the default case handle an unspecified class or does it
handle a class which is specified, but is not mentioned in any
of previous cases?
So in this example code the switch table is being used for
loading data serialized into text. If the class cannot determine
the node ID or it uses the default node type ID (e.g. the Node
type if super "Node") it will create a simple node, as you can
always be sure no matter what the type there will be sufficient
information stored in the data to construct a default Node.
Another information shortage is: are the tags exclusive or not?
So, is it possible that a class has more then one tag (still
being unique (tuple))?
ID tags are unique and spsecific to the class type. There
shouldn't be more than one type ID assigned to one class type.
The idea behind what it is I am doing is I am implementing a
solution to getting a type index, similar to
std.variant.Variant.type(). The way that I implemented this in
C++ is like so:
--------------------------------------------------------------------------------
inline unsigned int getNodeTypeID() {
static unsigned int lastID = 0;
return lastID++;
}
template<typename T> inline unsigned int getNodeTypeID() {
static unsigned int typeID = getNodeTypeID();
return typeID;
}
--------------------------------------------------------------------------------
In this C++ example I am exploiting the fact that templates are
generated at compile-time to execute getNodeTypeID for each new
type instance generated. After initial type generation, whenever
they are called at runtime they were return the ID assigned to
that function template instance that was generated at
compile-time.
It's pretty simple, and to be honest I'm surprised this has been
causing me such a headache implementing it in D.
