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Why do C++ libraries and frameworks never use smart pointers?
...ur heart’s content. Their source is available to your library at compile time, so you rely on the stability of their interfaces alone, not of their implementations.
But because of the lack of standard ABI, you generally cannot pass these objects safely across module boundaries. A GCC shared_ptr i...
How to implement one-to-one, one-to-many and many-to-many relationships while designing tables?
...tle varchar2(30),
Instructor varchar2(30),
Day varchar2(15),
Time varchar2(10)
);
CREATE TABLE Student(
StudentID varchar2(15) PRIMARY KEY,
Name varchar2(35),
Major varchar2(35),
ClassYear varchar2(10),
Status varchar2(10)
);
CREATE TABLE ClassStudentRelation...
Find nearest latitude/longitude with an SQL query
...L
) ENGINE = MYISAM ;
Populating the Table
After creating the table, it's time to populate it with data. The sample data provided below is for about 180 pizzarias scattered across the United States. In phpMyAdmin, you can use the IMPORT tab to import various file formats, including CSV (comma-separ...
CSS3 Rotate Animation
... return c*(t/d)+b;
}
});
}
rotation();
Where:
• t: current time,
• b: begInnIng value,
• c: change In value,
• d: duration,
• x: unused
No easing (linear easing):
function(x, t, b, c, d) { return b+(t/d)*c ; }
...
Getting the folder name from a path
...op, the DirectoryInfo class gets initialized once thus allowing only first-time call. In order to bypass this limitation, ensure you use variables within your loop to store any individual directory's name.
For example, this sample code loops through a list of directories within any parent directory...
What is the proper way to re-throw an exception in C#? [duplicate]
...e to disagree with all the answers here.
Now, I'll agree that most of the time you either want to do a plain throw, to preserve as much information as possible about what went wrong, or you want to throw a new exception that may contain that as an inner-exception, or not, depending on how likely yo...
Combine Date and Time columns using python pandas
...s in directly e.g. if you were using read_csv using parse_dates=[['Date', 'Time']].
Assuming these are just strings you could simply add them together (with a space), allowing you to apply to_datetime:
In [11]: df['Date'] + ' ' + df['Time']
Out[11]:
0 01-06-2013 23:00:00
1 02-06-2013 01:00:0...
A complete solution to LOCALLY validate an in-app receipts and bundle receipts on iOS 7
...tically generates obfuscated receipt validation code, a different one each time; it supports both GUI and command-line operation. Highly recommended.
(Not affiliated with Receigen, just a happy user.)
I use a Rakefile like this to automatically rerun Receigen (because it needs to be done on every ...
When should I use perror(“…”) and fprintf(stderr, “…”)?
...actual error was. Keep in mind that if you call other syscalls in the meantime, then the value in errno will be written over, and calling perror won't be of any use in diagnosing your issue if an error was generated by an earlier syscall.
fprintf(stderr, ...) on the other-hand can be used to print...
Data Modeling with Kafka? Topics and Partitions
...ssing is partition-local.
For example:
If you care about users' average time-on-site, then you should partition by :user-id. That way, all the events related to a single user's site activity will be available within the same partition. This means that a stream processing engine such as Apache Sam...