loki-lib | containing flexible implementations of common design
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Last update: Novmber 16, 2005.
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QUESTION
I am going through Chapter 3 of Alexandrescu's Modern C++ Design. It explains the implementation of HierarchyGenerators.h, however changes have been made to the library since then.
I am unable to understand how the ScatterHierarchyTag
solves the ambiguity in resolving Field
function (the function allows us to access members defined by particular Base
, for example Field(Object)
would get us a &Base
to Object
), when the typelist used to generate hierarchy has duplicates. (ex: GenScatterHierarchy Object
) I see that it adds a unique "type/tag" in each of the branches, right before the root Base
class, but still ambiguity is there right?
Thank you in advance.
EDIT:
Chart showing multiple inheritance issue with repeated types in typelist. GSH = GenScatterdHierarchy
I believe the unique tags are inserted seperately, for each of the two connections to Base
(marked one by blue line) (same goes for other base classes at root)
Also, I inserted picture to make it easier for everyone to understand. Let me know if it does not fit in stackoverflow's guidelines and I shall remove it.
...ANSWER
Answered 2019-Nov-11 at 04:27ScatterHierarchyTag
is not removing ambiguity. What it does, is making an ambiguous base class accessible.
Consider the following class hierarchy:
QUESTION
I am trying to use code (mostly header files) from the Loki library to test it's functionalities. I am getting error for lines that have #include
directives. I have never seen a path inside the < > or such. (I know about the normal #include
etc directives, and that it searches predefined path)
How does the include directives of the form work?
Am I right to assume that the library inserts itself into one of the standard paths that the compiler searches in? If so, any way to use it without inserting the library into said path. (I just want to test a function that includes these headers)
EDIT:
Test.cpp
...ANSWER
Answered 2019-Aug-14 at 21:42Meaning of "
#include
" directive (like "#include
")
The c++ standard (latest draft) says:
A preprocessing directive of the form
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