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How to implement the factory method pattern in C++ correctly
...d thing is that you can immediately see what coordinate type you're using, and at the same time you don't have to worry about copying. If you want copying, and it's expensive (as proven by profiling, of course), you may wish to use something like Qt's shared classes to avoid copying overhead.
As fo...
SQL UPDATE SET one column to be equal to a value in a related table referenced by a different column
...QuestionAnswers a
on q.AnswerID = a.AnswerID
where q.QuestionID is null -- and other conditions you might want
I recommend to check what the result set to update is before running the update (same query, just with a select):
select *
from QuestionTrackings q
inner join QuestionAnswers a
on q.Answ...
What use is find_package() if you need to specify CMAKE_MODULE_PATH anyway?
...ing CMake. Now the software has a few dependencies. I compiled them myself and installed them on my system.
4 Answers
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SQL WHERE.. IN clause multiple columns
...
You can make a derived table from the subquery, and join table1 to this derived table:
select * from table1 LEFT JOIN
(
Select CM_PLAN_ID, Individual_ID
From CRM_VCM_CURRENT_LEAD_STATUS
Where Lead_Key = :_Lead_Key
) table2
ON
table1.CM_PLAN_ID=table2.CM_PLAN...
How does HashSet compare elements for equality?
..., it will find the hash code using IEqualityComparer<T>.GetHashCode, and store both the hash code and the element (after checking whether the element is already in the set, of course).
To look an element up, it will first use the IEqualityComparer<T>.GetHashCode to find the hash code, t...
Android Fragments: When to use hide/show or add/remove/replace?
...longer visible. So you could technically still interact with the fragment and reattach its UI later you need to. If you replace the fragment, the you are actually pulling it out of the container and it will go through all of the teardown events in the lifecycle (onPause, onStop, etc) and if for so...
How do I declare a namespace in JavaScript?
How do I create a namespace in JavaScript so that my objects and functions aren't overwritten by other same-named objects and functions? I've used the following:
...
How to set a cookie for another domain
Say I have a website called a.com , and when a specific page of this site is loaded, say page link, I like to set a cookie for another site called b.com , then redirect the user to b.com .
...
Set environment variables from file of key/value pairs
...your approach is the export in the while loop is happening in a sub shell, and those variable will not be available in current shell (parent shell of while loop).
Add export command in the file itself:
export MINIENTREGA_FECHALIMITE="2011-03-31"
export MINIENTREGA_FICHEROS="informe.txt programa.c"...
In C# what is the difference between a destructor and a Finalize method in a class?
What is the difference, if there is one, between a destructor and a Finalize method in a class?
3 Answers
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