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What is a good Hash Function?
...hms vetted by public scrutiny. The Hash Function Lounge is a good place to start.
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Using sed and grep/egrep to search and replace
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"\.jpg|\.png|\.gif": match one of the strings ".jpg", ".gif" or ".png"
.: start the search in the current directory
xargs: execute a command with the stdin as argument
-0: use \0 as record separator. This is important to match the -Z of egrep and to avoid being fooled by spaces and newlines in i...
SQL update fields of one table from fields of another one
...unwanted parenthesis around string in plpgsql
Update multiple columns that start with a specific string
Partial solutions with plain SQL
With list of shared columns
You still need to know the list of column names that both tables share. With a syntax shortcut for updating multiple columns - shorter...
The role of #ifdef and #ifndef
...be two closing endif lines at some point and the first will cause lines to start being included again, as follows:
#define one 0
+--- #ifdef one
| printf("one is defined "); // Everything in here is included.
| +- #ifndef one
| | printf("one is not defined "); // Everything in here is ...
Why use String.Format? [duplicate]
...ce Concat can create an internal buffer of exactly the right size from the start. A SB is used when you have some sort of loop or other control block such that the number of strings being concatted isn't known by the compiler at compile time.
– Servy
Mar 19 '1...
Where should Rails 3 custom validators be stored?
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@Doug you need to restart your server. The autoload paths are expanded on initialization so new subfolders will not get picked up until you do that.
– Timo
Oct 8 '12 at 23:36
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Fastest way to count exact number of rows in a very large table?
...nsaction has to "obtain a ticket" for updating its count. So transactions start queueing up at the ticket machine (the scheduler deciding who will be the next to get a lock on the counts table).
– Erwin Smout
Apr 8 '19 at 12:32
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String representation of an Enum
...t an enum. I can imagine that causing some interesting problems if people start trying to compare AuthenticationMethods. You probably need to overload various equality operators too.
– Ant
Feb 25 '10 at 9:18
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Should I use char** argv or char* argv[]?
...u declared a pointer or an array there - both will be taken as a pointer). Starting with C99, you can benefit from declaring it as an array. The following says: "p is always non-null and points to a region with at least 100bytes": void f(char p[static 100]); Note that type-wise, however, p is still...
Is it possible to “decompile” a Windows .exe? Or at least view the Assembly?
...t?
Modern computer programs are produced through a series of conversions, starting with the input of a human-readable body of text instructions (called "source code") and ending with a computer-readable body of instructions (called alternatively "binary" or "machine code").
The way that a computer...