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How exactly do Django content types work?
...t is a "compromise" of sorts to bypass some of the rigid fundamentals of a table oriented SQL system. Do not prematurely optimize your app! Django is best at getting out of your way so you can write the next generation application you have always wanted: use it's features to your advantage!
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Different types of thread-safe Sets in Java
... like for HashMap/HashSet. There is a limited concurrency for writing (the table is partitioned, and write access will be synchronized on the needed partition), while read access is fully concurrent to itself and the writing threads (but might not yet see the results of the changes currently being w...
Possibility of duplicate Mongo ObjectId's being generated in two different collections?
...of different "types" in the same collection, so why not just put your two "tables" in the same collection. They would share the same _id space, and thus, would be guaranteed unique. Switching from "prospective" to "registered" would be a simple flipping of a field...
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How does the compilation/linking process work?
...ct files produced by the compiler and produces either a library or an executable file.
Preprocessing
The preprocessor handles the preprocessor directives, like #include and #define. It is agnostic of the syntax of C++, which is why it must be used with care.
It works on one C++ source file at a ...
Maintain the aspect ratio of a div with CSS
...></div>
For other aspect ratios, you can use the following table to calculate the value for height according to the width of the element :
aspect ratio | multiply width by
-----------------------------------
1:1 | 1
1:3 | 3
4:3 | ...
How to read contacts on Android 2.0
...e amount of data that is returned.
String key, value, phoneNumber;
Hashtable contactPhoneInfo = new Hashtable<String, String>();
Uri phoneUri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
String [] PHONES_PROJECTION = new String[] { ContactsContract.CommonDataKinds.Phone.NUMBER ...
Code Golf: Lasers
...&redo}die/x/?true:false,$/
The first line loads the input into %t, a table of the board where $t{99*i+j} holds the character at row i,column j. Then,
%d=split//,'>.^1<2v3' ; ($r)=grep{$d|=$d{$t{$_}}}%t
it searches the elements of %t for a character that matches > ^ < or v, and s...
What is the difference between a port and a socket?
..., W. Richard Stevens)
In most C-derived languages, TCP connections are established and manipulated using methods on an instance of a Socket class. Although it is common to operate on a higher level of abstraction, typically an instance of a NetworkStream class, this generally exposes a reference t...
How do I tell Maven to use the latest version of a dependency?
...e some uncertainties between versions/releases/snapshots in this very nice table here: goo.gl/iDq6PK
– Ev0oD
Oct 13 '14 at 13:13
1
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Is std::vector so much slower than plain arrays?
...ver the buffer.
(The two overloads where added to handle movable, constructable and non-copyable types -- the performance improvement when working on uninitialized data is a bonus).
The push_back solution also does fencepost checking, which slows it down, so it remains slower than the malloc versi...