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dynamic_cast and static_cast in C++
...n order for the cast to be legal.
Casts can go in one of two directions: from base to derived (B2D) or from derived to base (D2B). It's simple enough to see how D2B casts would work at runtime. Either ptr was derived from Type or it wasn't. In the case of D2B dynamic_cast<>s, the rules ar...
How to git log from all branches for the author at once?
...r command is right, since you use the --all switch which gives all commits from all branches. To answer the question in your comment, it works also in bare repositories.
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Is there an alternative to string.Replace that is case-insensitive?
... all occurrences of %FirstName% and %PolicyAmount% with a value pulled from a database. The problem is the capitalization of FirstName varies. That prevents me from using the String.Replace() method. I've seen web pages on the subject that suggest
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Proper practice for subclassing UIView?
...ods, but when subclassing a UIView, the closest methosds I have are `awakeFromNib , drawRect , and layoutSubviews . (I'm thinking in terms of setup and teardown callbacks.) In my case, I'm setting up my frame and internal views in layoutSubviews , but I'm not seeing anything onscreen.
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How to convert index of a pandas dataframe into a column?
...the index into the columns (one column per level) and creates an int index from 0 to len(df)-1
– BallpointBen
Jan 10 '19 at 19:52
2
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How to migrate back from initial migration in Django 1.7?
...also:
python manage.py migrate <app> zero
This clears <app> from migration history and drops all tables of <app>
See django docs for more info.
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Convert from List into IEnumerable format
...c IEnumerable<Book> GetBooks()
{
List<Book> books = FetchEmFromSomewhere();
return books;
}
as well as:
public void ProcessBooks(IEnumerable<Book> books)
{
// do something with those books
}
which could be invoked:
List<Book> books = FetchEmFromSomewhere...
How to get subarray from array?
...have var ar = [1, 2, 3, 4, 5] and want some function getSubarray(array, fromIndex, toIndex) , that result of call getSubarray(ar, 1, 3) is new array [2, 3, 4] .
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Difference between DateTime and Time in Ruby
...12 00:00:00 +0000
So it's reassuring that DateTime can handle blog posts from Aristotle.
When choosing one, the differences are somewhat subjective now. Historically DateTime has provided better options for manipulating it in a calendar fashion, but many of these methods have been ported over to ...
Bulk insert with SQLAlchemy ORM
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Compared to inserting the same data from CSV with \copy with psql (from the same client to the same server), I see a huge difference in performance on the server side resulting in about 10x more inserts/s. Apparently is bulk-loading using \copy (or COPY on the ...