UML diagram diamond arrow
I do not have much experience with UML diagrams and was coming across a diagram which I didn't fully understood.
When I have the following UML diagram:
What my current understanding is about this UML diagram based on my research is that the observers are aggregated in the subject. And that concreteObserverA and concreteObserverB inherit from Observer.
Questions:
- Is my current understanding which I described correct?
- I saw in all sources from which I studied UML diagrams that they denote aggregation with an arrow. Is the relationship between Observer and subject still aggregation or is it something else?
Yes, that how most people whit UML knowledge will understand it.
Please, can you point to that source? Actually, Arrow is not Aggregation but Association relationship, that's two different but also very similar relationships.
If you mean arrow==association and you man that observer pattern is painted using it, I would say that it only depends on who has that painted. See a discussion about these relations here: https://softwareengineering.stackexchange.com/questions/235313/uml-class-diagram-notations-differences-between-association-aggregation-and-co.
- gobject/gnome/glib bindings for D using GIR?
- How do nested functions get compiled?
- The "this" pointer and message receiving in D
- 64-bit executables with DMD
- GtkD with D lang on Fedora
- Why Android used Java concept instead of D language or C or C++? But Chromium web browser is in C++, its very complicated match
- How to use MongoItemWriter to write a List<T>
- Why a function with protected modifier can be overridden and accessible every where?
- Convert Unicode const(uint)* to a dlang character type
- Compiling D with Code::Blocks
- DMD vs. GDC vs. LDC
- Rendering a font in raylib using freetype
- Digital Mars D compiler; acquiring ASM output
- D Programming: openssl rsa forward reference compiler error
- D compiler DMD doesn't link object files
- OPTLINK: Warning 23: No Stack
- Is there a limit in the amount of temporary generated symbols during a project build using dmd 2.063?
- Is this the right way to combine Garbage collected with none Garbage collected code in D
- D compiler (Digital Mars D Compiler) throwing error
- Which D Compiler to Use?
- Splitting a string treating multiple whitespace as one separator
- Proper way of passing array parameters to D functions
- Detailed Valgrind internals documentation
- Is it possible, in D, to tell the garbage collector to not scan a particular pointer (or anything below it)?
- Iterate over key/value pairs in associative array in D.
- Dlang associative array of an array of strings keyed by a string has unexpected behavior
- How to repeat a statement N times (simple loop)
- Is worth the effort to learn D?
- ld: undefined reference to object I can see in objdump
- D using emplace