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When to use an interface instead of an abstract class and vice versa?
...think this was the "lightbulb" moment for me - think about interfaces less from the author's perpective and more from that of any coder coming later in the chain who is adding implementation to a project, or extending an API.
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JPA - Returning an auto generated id after persist()
...ated a separate table named hibernate_sequences and restarted the sequence from 1.
– SriSri
May 4 '18 at 3:37
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sqlalchemy flush() and get inserted id?
... You just saved my ass. I don't think I will ever use the ORM again coming from Django. The flush() command does NOT work as documented IMHO.
– Marc
May 8 '16 at 21:20
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size_t vs. uintptr_t
...any pointer type."
This is actually a fallacy (a misconception resulting from incorrect reasoning)(a). You may think the latter follows from the former but that's not actually the case.
Pointers and array indexes are not the same thing. It's quite plausible to envisage a conforming implementation...
How do I replace a git submodule with another repo?
...d here, which I'm including for convenience:
Delete the relevant section from the .gitmodules file
Delete the relevant section from .git/config
Run git rm --cached path_to_submodule (no trailing slash)
Commit and delete the now untracked submodule files
Now, add the new submodule with the --name...
What happens to git commits created in a detached HEAD state?
... state with
git reflog
Then execute, with all the commit hashes ordered from oldest to most recent:
git cherry-pick <hash1> <hash2> <hash3> ...
For example if I had only one, given in the "first 7 characters" short hash format:
git cherry-pick a21d053
This will create new...
Equivalent of Math.Min & Math.Max for Dates?
...what the values contain, compare them and then create a new DateTime value from the result:
new DateTime(Math.Min(Date1.Ticks, Date2.Ticks))
(Note that the DateTime structure also contains a Kind property, that is not retained in the new value. This is normally not a problem; if you compare DateT...
C++, Free-Store vs Heap
...n one
area cannot be safely deallocated in
the other. Memory allocated from the
heap can be used for objects of class
type by placement-new construction and
explicit destruction. If so used, the
notes about free store object lifetime
apply similarly here.
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Vim: Move cursor to its last position
...) any motion command other than the i j k l movements. (The complete list, from the help docs, is "'"', "`", "G", "/", "?", n", "N", "%", "(", ")", "[[", "]]", "{", "}", ":s", ":tag", "L", "M", H" and the commands that start editing a new file.) So no, this won't "undo" 2j or similar, but it will wo...
TypeError: sequence item 0: expected string, int found
I am attempting to insert data from a dictionary into a database. I want to iterate over the values and format them accordingly, depending on the data type. Here is a snippet of the code I am using:
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