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How expensive is RTTI?
...e in runtime memory usage.
A quick experiment (using GCC 4.4.3 on Ubuntu 10.04 64-bit) shows that -fno-rtti actually increases the binary size of a simple test program by a few hundred bytes. This happens consistently across combinations of -g and -O3. I'm not sure why the size would increase; one ...
OSGi, Java Modularity and Jigsaw
...
100
First understand that Jigsaw's primary use case is to modularise the JRE itself. As a secondary...
Converting Secret Key into a String and Vice Versa
... using SecretKeySpec
SecretKey originalKey = new SecretKeySpec(decodedKey, 0, decodedKey.length, "AES");
For Java 7 and before (including Android):
NOTE I: you can skip the Base64 encoding/decoding part and just store the byte[] in SQLite. That said, performing Base64 encoding/decoding is not...
Get file version in PowerShell
... list of files:
get-childitem * -include *.dll,*.exe | foreach-object { "{0}`t{1}" -f $_.Name, [System.Diagnostics.FileVersionInfo]::GetVersionInfo($_).FileVersion }
Or even nicer as a script: https://jtruher3.wordpress.com/2006/05/14/powershell-and-file-version-information/
...
How to change a module variable from another module?
...
105
You are using from bar import a. a becomes a symbol in the global scope of the importing module...
Why doesn't java.lang.Number implement Comparable? [duplicate]
...
It's worth mentioning that the following expression:
new Long(10).equals(new Integer(10))
is always false, which tends to trip everyone up at some point or another. So not only can you not compare arbitrary Numbers but you can't even determine if they're equal or not.
Also, with the ...
INSERT IF NOT EXISTS ELSE UPDATE?
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330
Have a look at http://sqlite.org/lang_conflict.html.
You want something like:
insert or replac...
What are WSGI and CGI in plain English?
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60
WSGI runs the Python interpreter on web server start, either as part of the web server process (...
搭建高可用mongodb集群（二）—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...
...制台上显示副本集还没有配置初始化信息。
Sun Dec 29 20:12:02.953 [rsStart] replSet can't get local.system.replset config from self or any seed (EMPTYCONFIG)
Sun Dec 29 20:12:02.953 [rsStart] replSet info you may need to run replSetInitiate -- rs.initiate() in the shell -- if ...
Difference between / and /* in servlet mapping url pattern
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edited Jun 20 at 9:12
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answered Nov 10 '10 at 2:13
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