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Linux equivalent of the Mac OS X “open” command [closed]
...en &>/dev/null' yields approximately the desired behavior (although errors from xdg-open itself (as opposed to just the launched program) would also be silenced, which is undesirable).
– Max Nanasy
Nov 16 '12 at 10:04
...
Case conventions on element names?
... and not for the XSLT parser. However since this will often not produce an error, using 'lowercase with hyphens' as a standard is asking for trouble, IMHO.
Some pertinent examples:
<a>1</a><b>1</b>
<xsl:value-of select="a+b"/>
outputs 2, as expected
<a>1</a&...
C# vs C - Big performance difference
... Lots more interesting reading here: blogs.msdn.com/ricom/archive/2005/05/10/416151.aspx
– Daniel Earwicker
Mar 26 '09 at 16:57
18
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Any gotchas using unicode_literals in Python 2.6?
..."one.py", line 5, in <module>
print name + two.name
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 4: ordinal not in range(128)
In this example, two.name is an utf-8 encoded string (not unicode) since it did not import unicode_literals, and one.name is an unicode st...
PDO closing connection
...r a number of other reasons. When connecting or running a query, catch any error, and if it is "MySQL has gone away", attempt to connect again or run the query a second time.
– Frank Forte
Dec 14 '17 at 20:50
...
How can I tell if I'm running in 64-bit JVM or 32-bit JVM (from within a program)?
..., run:
$ java -d64 -version
If it's not a 64-bit JVM, you'll get this:
Error: This Java instance does not support a 64-bit JVM.
Please install the desired version.
Similarly, to check for a 32-bit JVM, run:
$ java -d32 -version
If it's not a 32-bit JVM, you'll get this:
Error: This Java in...
How does interfaces with construct signatures work?
...tructor (public name: string, count: number) {
}
}
makeObj(Other); // Error! Other's constructor doesn't match StringConstructable
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Python nested functions variable scoping [duplicate]
...
When I run your code I get this error:
UnboundLocalError: local variable '_total' referenced before assignment
This problem is caused by this line:
_total += PRICE_RANGES[key][0]
The documentation about Scopes and Namespaces says this:
A special ...
Is there a performance difference between i++ and ++i in C++?
...xtremely:
Flags (--std=c++0x) ++i i++
-DPACKET_SIZE=50 -O1 0.05 0.74
-DPACKET_SIZE=50 -O3 0.08 0.97
-DPACKET_SIZE=500 -O1 0.05 2.79
-DPACKET_SIZE=500 -O3 0.08 2.18
-DPACKET_SIZE=5000 -O3 0.07 21.90
Conclusion
Performance-wise
If you do not need the previo...
What is the difference between is_a and instanceof?
...x it now though. The problem is that the instanceof operator throws syntax errors in PHP 4, and since is_a was deprecated at the exact same time as the operator was introduced it became impossible to write code for both PHP 4 and 5 without throwing an E_STRICT around. You can't even do if (version_c...