On Thursday, 17 January 2013 at 04:38:14 UTC, Ali Çehreli wrote:
On 01/16/2013 05:59 PM, Joseph Cassman wrote:
I was wondering what the syntax is for user defined attributes
(I.e. bug 9222) implemented in release 2.061. I was still
unclear after reading the thread
forum.dlang.org/thread/k7afq628...@digitalmars.com.
Thanks for the help
Joseph
The following is the code that I had used for experimenting
with UDAs:
This is by far the most comprehensive explanation of how to use
them that I've seen so far. Still a couple questions.
Do the structs have to be empty? (Do they have to be structs?)
If they don't and you add code, can that code help/add or modify
the attributed object (or can it at all?).
Seems somehow in my mind there's two approaches to how the
attributes work
Define in one place, it modifies what it attaches to. This would
be good for like serialization, perhaps adding unique functions
for a particular set of jobs.
struct Serialize {
//assuming it's mixed in similar to a mixin template.
void write(R)()
if (isOutputRange!(R)) {
//foreach over all elements and and save them, or
//on items marked with an attribute to be saved
}
}
@Serialize struct S {
//write appended in silently from UDA
int x;
}
Used definition(s) where functions need to (statically)
recognize them to interact with them. This is what currently it
seems like it's doing, which is simpler to understand and
integrate, but somehow only feels like half the formula.
struct Serialize {}
struct S {
@Serialize int x;
}
void write(R, S)(R outputRange, S inputStruct)
if (isOutputRange!(R)) {
//foreach, if variable(s) have @Serialize then we write it.
}
