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Interface vs Abstract Class (general OO)
...e strategy pattern. A Pilot would have a collection of certifications, and select the correct one at runtime. The certifications would be coded as behaviors that would implement the IFlyPlane interface, with TakeOff, Land, Eject methods.
– Michael Blackburn
Dec...
How do I fix a merge conflict due to removal of a file in a branch?
...Rescan for changes in Git Gui (F5)
Notice that conflicting file is deleted
Select Stage Changed Files To Commit (Ctrl-I) from Commit menu
Enter a commit comment like "deleted conflicting file"
Commit (ctrl-enter)
Now if you restart the merge it will (hopefully) work.
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String formatting in Python 3
...ith decimal integer format.
There are many others things you can do when selecting an argument (using named arguments instead of positional ones, accessing fields, etc) and many format options as well (padding the number, using thousands separators, showing sign or not, etc). Some other examples:
...
Running unittest with typical test directory structure
...Major Major". They can run with python -m unittest discover but how can I select to run only one of them. If I run python -m unittest tests/testxxxxx then it fails for path issue. Since dicovery mode solve everything I would expect that there is another trick to solve path issue without handcoding...
Finding all cycles in a directed graph
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This answer is much better than the answer selected. I struggled for quite a while trying to figure out how to get all simple cycles from the strongly connected components. It turns out this is non-trivial. The paper by Johnson contains a great algorithm, but is a lit...
Tuples( or arrays ) as Dictionary keys in C#
...sonId: 4, LocationId: 9, SubjectId: 10), "XYZ");
var personIds = dict.Keys.Select(k => k.PersonId).Distinct().ToList();
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Design patterns to avoid [closed]
...you end up with when you wish to use a single-type dispatch OO language to select the code to use based on the type of two (or more) different objects.
The classic example being that you have the intersection between two shapes, but there's an even simpler case that's often overlooked: comparing th...
The order of elements in Dictionary
...r elements in key-order then they should to dict.Keys.OrderBy( k => k ).Select( k => dict[k] ) instead (at the cost of O(n) space and O( n log n ) time) for the OrderBy() (which will need to buffer the entire keys collection in an internal list).
– Dai
Oc...
Pointer to class data member “::*”
...unction that would do some pre &post processing before applying a user-selected member function to an object:
void Apply( SomeClass * c, void (SomeClass::*func)() ) {
// do hefty pre-call processing
(c->*func)(); // call user specified function
// do hefty post-call processing
}...
Autowiring two beans implementing same interface - how to set default bean to autowire?
...public class HibernateDeviceDao implements DeviceDao
This way it will be selected as the default autowire candididate, with no need to autowire-candidate on the other bean.
Also, rather than using @Autowired @Qualifier, I find it more elegant to use @Resource for picking specific beans, i.e.
@Re...