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How to install a specific version of a ruby gem?
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ruby | 1:1.9.3 | http://ftp.uk.debian.org/debian/ wheezy/main amd64 Packages
ruby | 4.5 | http://ftp.uk.debian.org/debian/ squeeze/main amd64 Packages
Then install it:
$ sudo apt-get install ruby=1:1.9.3
To check what's the current version, run:
$ gem --version # Check f...
What is the maximum float in Python?
...lue of a C long. On some platforms the two values are different: e.g., on 64-bit Windows, sys.maxsize is 2**63-1 and sys.maxint is 2**31-1.
– Mark Dickinson
Aug 14 '10 at 9:29
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#pragma pack effect
...it on a 7 byte boundary will hurt performance. But putting it on a 16, 32, 64 or 4096 byte boundary buys you nothing above what the 8 byte boundary already gave you. You'll get the same performance from the CPU, while getting much worse cache utilization for the reasons outlined in that post.
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What are naming conventions for MongoDB?
...asz NurkiewiczTomasz Nurkiewicz
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Setup a Git server with msysgit on Windows [closed]
...It's long, but I have successfully got this working on Windows 7 Ultimate x64.
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Checking whether a variable is an integer or not [duplicate]
...even if the real part is integral and imaginary part is 0.
(np.int8|16|32|64(5) means that np.int8(5), np.int32(5), etc. all behave identically)
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AngularJS UI Router - change url without reloading state
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Simply ...
ros 基本调试 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的kdcom.dll文件，编译的时候还需要加上WINDK=1开关。而在64位的ros上，windbg是最主要的调试方法，和x64版本的kdcom.dll有很好的兼容性。
生成更多输出
如果想要得到更多有意义的输出，有必要额外开启verbosity功能。
编译时开启ver...
Embed SVG in SVG?
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André Werlang
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answered Aug 10 '14 at 16:28
oabarcaoabarca
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Why is there no std::stou?
...expected value size in bits expressed in the mask, will make this work for 64-bit longs vs 32-bit ints, but also for 32-bit longs vs 32-bit ints.
In the case of 64-bit longs, ~0xffffffffl will become 0xffffffff00000000 and will thus see if any of the top 32 bits are set. With 32-bit longs, it ~0xf...