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How to append a char to a std::string?
...al studio 2015 as compiler and my processor is an i7, 8Hz, 2GHz.
long start = clock();
int a = 0;
//100000000
std::string ret;
for (int i = 0; i < 60000000; i++)
{
ret.append(1, ' ');
//ret += ' ';
//ret.push_back(' ');
//ret.insert(ret.end...
How to query MongoDB with “like”?
...st do a table scan, then it can certainly be expensive. If you're doing a 'starts with' regex query, then that can use an index. Best to run an explain() to see what's happening.
– Kyle Banker
Jul 22 '10 at 14:49
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Difference between JVM and HotSpot?
... of the Java Platform, Standard Edition (Java SE).The openjdk is a project started by Sun Microsystems, nowadays care by many companies and the community for build a Java Development Kit absolutely in open source. As per the official documentation.
OpenJDK is an open-source implementation of the Ja...
Decimal number regular expression, where digit after decimal is optional
...digits (\d*).
Depending on your usage or regex engine you may need to add start/end line anchors:
/^\d+\.?\d*$/
Debuggex Demo
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How to print to console in pytest?
...t:
>>> py.test tmp.py
============================= test session starts ==============================
platform darwin -- Python 2.7.6 -- py-1.4.20 -- pytest-2.5.2
plugins: cache, cov, pep8, xdist
collected 2 items
tmp.py .F
=================================== FAILURES ==================...
Mythical man month 10 lines per developer day - how close on large projects? [closed]
...at the "10 lines per developer per day" from the "Mythical Man Month", and starting a project, I can usually get a couple hundred lines in in a day.
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How does BLAS get such extreme performance?
...
A good starting point is the great book The Science of Programming Matrix Computations by Robert A. van de Geijn and Enrique S. Quintana-Ortí. They provide a free download version.
BLAS is divided into three levels:
Level 1 defin...
What does SynchronizationContext do?
...gh degree, take care of capturing the UI thread's synchronization context, starting an asynchronous operation, then getting back onto the UI thread so you can process the operation's result.
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How do we use runOnUiThread in Android?
... e.printStackTrace();
}
}
}
}.start();
}
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How do I fix “Failed to sync vcpu reg” error?
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Got this issue on Mac. After turn off VBox it started to work.
– 0x8BADF00D
Feb 18 '15 at 18:24
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