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What is the difference between the | and || or operators?
... know what that is. It's used in conditional statements such as if, while, etc.
condition1 || condition2
Evaluates to true if either condition1 OR condition2 is true.
| is the bitwise OR operator. It's used to operate on two numbers. You look at each bit of each number individually and, if one o...
When should I use mmap for file access?
...TLB, the table is global so has to be protected against concurrent access, etc.). You need a certain size of map so that the overhead of read accesses is higher than the overhead of virtual memory manipulation.
– Patrick Schlüter
May 24 '10 at 8:36
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When using the Java debugger in Intellij what does “Drop Frame” mean?
... have occurred - e. g. network traffic, file manipulations, console output etc. - cannot be rewound.
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Is Java Regex Thread Safe?
...41681.html#A14 : "The Java 2 SDK, Standard Edition itself contains a file called src.zip that contains the source code for the public classes in the java package") so one can take a quick peek oneself.
– David Tonhofer
Nov 18 '13 at 15:40
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Why use Object.prototype.hasOwnProperty.call(myObj, prop) instead of myObj.hasOwnProperty(prop)?
...s of at least the built–in ECMAScript objects (Object, Function, Number, etc.) and probably some native objects (e.g. functions). It may also have some host objects (such as DOM objects in a browser, or other objects in other host environments).
While built–in and native objects must implement...
Difference between map and collect in Ruby?
I have Googled this and got patchy / contradictory opinions - is there actually any difference between doing a map and doing a collect on an array in Ruby/Rails?
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Can a class member function template be virtual?
...to a
normal function call, a virtual function call requires two extra
fetches (one to get the value of the v-pointer, a second to get the
address of the method). None of this runtime activity happens with
non-virtual functions, since the compiler resolves non-virtual
functions exclusively ...
Maximum number of threads per process in Linux?
.../100k-pthread-create-app
2018 update from @Thomas, on systemd systems:
/etc/systemd/logind.conf: UserTasksMax=100000
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efficient way to implement paging
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Try using
FROM [TableX]
ORDER BY [FieldX]
OFFSET 500 ROWS
FETCH NEXT 100 ROWS ONLY
to get the rows from 501 to 600 in the SQL server, without loading them in memory. Note that this syntax has become available with SQL Server 2012 only
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Graphviz: How to go from .dot to a graph?
...neato and twopi. If graphiz isn't in your path, figure out where it is installed and run it from there.
You can change the output format by varying the value after -T and choosing an appropriate filename extension after -o.
If you're using windows, check out the installed tool called GVEdit, it ma...