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'printf' vs. 'cout' in C++
...rintf is C (however, you can use it in C++, just like almost anything else from C). Now, I'll be honest here; both printf and std::cout have their advantages.
Real differences
Extensibility
std::cout is extensible. I know that people will say that printf is extensible too, but such extension is n...
How can one print a size_t variable portably using the printf family?
...d not featured in the list of printf() length modifiers of the C++0x draft from 2009-11-09 (table 84 on page 672)
– Christoph
Mar 26 '10 at 16:28
3
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How do I debug an MPI program?
...ce Analysis Tool (STAT). We use this at Livermore to collect stack traces from potentially hundreds of thousands of running processes and to represent them intelligently to users. It's not a full-featured debugger (a full-featured debugger would never scale to 208k cores), but it will tell you whi...
How can I clear or empty a StringBuilder? [duplicate]
...ngth to zero. The remaining allocations are still there. This answer stems from the javascript length = 0 for arrays, which performs a magical operation to mark the array reusable, but even there i am not sure, and don't trust it. The underlying array will never be garbage collected.
...
What is trunk, branch and tag in Subversion? [duplicate]
...ion", especially Chapter 4: Branching and Merging or buy it in paper (e.g. from amazon) for an in-depth discussion of the technical details.
As others (e.g. Peter Neubauer below) the underlying implementation as /tags /branches and /trunk directories is only conventional and not in any way enforced...
Add timestamps to an existing table
...ns, default: DateTime.now
change_column_default :campaigns, :created_at, from: DateTime.now, to: nil
change_column_default :campaigns, :updated_at, from: DateTime.now, to: nil
end
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impro...
uwsgi invalid request block size
...ttings.
buffer-size=32768
or in commandline mode:
-b 32768
Quote from official documentation:
By default uWSGI allocates a very small buffer (4096 bytes) for the headers of each request. If you start receiving “invalid request block size” in your logs, it could mean you need a bigg...
What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
...an *. Specifically:
$@ "[e]xpands to the positional parameters, starting from one. When the expansion occurs within double quotes, each parameter expands to a separate word."
In an array, "[i]f the word is double-quoted, ${name[*]} expands to a single word with the value of each array member separ...
How to copy a file to a remote server in Python using SCP or SSH?
... first if you're not using a with block), so you know it's flushed to disk from Python.
You need to generate (on the source machine) and install (on the destination machine) an ssh key beforehand so that the scp automatically gets authenticated with your public ssh key (in other words, so your scri...
NSObject +load and +initialize - What do they do?
...ed for you by the Objective-C runtime, but that's really all that is clear from the documentation of those methods. :-)
2 A...