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How would I get a cron job to run every 30 minutes?
...to add a crontab entry to execute a script every 30 minutes, on the hour and 30 minutes past the hour or something close. I have the following, but it doesn't seem to run on 0.
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Output to the same line overwriting previous output?
... I found I needed to include the \r at the start of the string, and set end='' instead to get this to work. I don't think my terminal likes it when I end with \r
– Jezzamon
Jan 20 '16 at 0:46
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What is array to pointer decay?
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const int a[] = { 2, 3, 5, 7, 11 };
into a pointer (which works without casting, and therefore can happen unexpectedly in some cases):
const int* p = a;
you lose the ability of the sizeof operator to count elements in the array:
assert( sizeof(p) != sizeof(a) ); // sizes are not equal
This...
When should I use double instead of decimal?
...ecimal is causing bottlenecks or slow-downs. In those cases, I will "down cast" to double or float, but only do it internally, and carefully try to manage precision loss by limiting the number of significant digits in the mathematical operation being performed.
In general, if your value is transie...
sed in-place flag that works both on Mac (BSD) and Linux
...on of sed todo in-place editing without backups that works both on Linux and Mac? While the BSD sed shipped with OS X seems to need sed -i '' … , the GNU sed Linux distributions usually come with interprets the quotes as empty input file name (instead of the backup extension), and needs se...
google mock分享（全网最全最好的gmock文档，没有之一） - C/C++ - 清泛网 ...
...ce failed" << std::endl;
}
return static_cast<InterfaceType* >(pInterface);
}
};
}
#endif // IAPIPROVIDERINTERFACE_H_
Rank.cc 既然IAPIProviderInterface.h改了，那Rank.cc中对它的调用其实也不是之前那样的。不过其实也就...
Is there a way for multiple processes to share a listening socket?
In socket programming, you create a listening socket and then for each client that connects, you get a normal stream socket that you can use to handle the client's request. The OS manages the queue of incoming connections behind the scenes.
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How can I ensure that a division of integers is always rounded up?
...ounded up if necessary. Is there a better way than this? There is a lot of casting going on. :-)
8 Answers
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Android中Java和JavaScript交互 - 更多技术 - 清泛网 - 专注C/C++及内核技术
Android中Java和JavaScript交互interaction-between-java-and-javascript-in-androidAndroid提供了一个很强大的WebView控件用来处理Web网页，而在网页中，JavaScript又是一个很举足轻重的脚本。本文将介绍如何实现Java代码和Javascript代码的相互调用。如...
C++ preprocessor __VA_ARGS__ number of arguments
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@Adam Because I cast {__VA_ARGS__} to int[], it is just int[], regardless of actual content of __VA_ARGS__
– qrdl
Jan 23 '10 at 20:45
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