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Why does auto a=1; compile in C?
...sor B, where there were no base types: everything was int, pointer to int, array of int.(*) Declarations would be either auto or extrn [sic]. C inherited the "everything is int" as a default rule, so you could declare integers with
auto a;
extern b;
static c;
ISO C got rid of this, but many compi...
Is “argv[0] = name-of-executable” an accepted standard or just a common convention?
...ion before that states:
If the value of argc is greater than zero, the array members argv[0] through argv[argc-1] inclusive shall contain pointers to strings, which are given implementation-defined values by the host environment prior to program startup.
This is unchanged from C99, the previou...
Git log to get commits only for a specific branch
...Do fewer allocations for simple default values.
| |
| | Don't allocate arrays when we are only assigning a single array key
| | value.
| |
* | commit c3f45e811e4b49fe27624b57c3eb8f4721a4323b
|\ \ Merge: 10e5734 43178fd
| |/ Author: Mark Story <mark@mark-story.com>
|/| Date: Mon...
Looping through the content of a file in Bash
...ld look something like read -r X <&3.
Reading a whole file into an array (Bash versions earlier to 4)
while read -r line; do
my_array+=("$line")
done < my_file
Center a map in d3 given a geoJSON object
...d, sets the projection’s center to the specified location, a two-element array of longitude and latitude in degrees and returns the projection. If center is not specified, returns the current center which defaults to ⟨0°,0°⟩.
There is also the translation, given in pixels - where the proje...
How to use PHP OPCache?
...our functions which you can use:
opcache_get_configuration():
Returns an array containing the currently used configuration OpCache uses. This includes all ini settings as well as version information and blacklisted files.
var_dump(opcache_get_configuration());
opcache_get_status():
This will r...
Cast Object to Generic Type for returning
...on of that method is:
public T cast(Object o)
This can also be used for array types. It would look like this:
final Class<int[]> intArrayType = int[].class;
final Object someObject = new int[]{1,2,3};
final int[] instance = convertInstanceOfObject(someObject, intArrayType);
Note that whe...
Why can't strings be mutable in Java and .NET?
... internal data. For many string operations, this means that the underlying array of characters does not need to be copied. For example, say you want to take the five first characters of String. In Java, you would calls myString.substring(0,5). In this case, what the substring() method does is simply...
Adding two Java 8 streams, or an extra element to a stream
...f the stream. On top of that, the collector concat creates an intermediate ArrayList each time it is used in the chain. Both operations can have a significant impact on the behaviour of your program. However, if readability is more important than performance, it might still be a very helpful approac...
SQL injection that gets around mysql_real_escape_string()
...gt;prepare('SELECT * FROM test WHERE name = ? LIMIT 1');
$stmt->execute(array("\xbf\x27 OR 1=1 /*"));
Now, it's worth noting that you can prevent this by disabling emulated prepared statements:
$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
This will usually result in a true prepared...