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How do I create an immutable Class?
...e case, you should copy away whatever state you will want to retain and avoid returning entire mutable objects, unless you copy them before giving them back to the caller - another option is to return only immutable "sections" of the mutable object - thanks to @Brian Rasmussen for encouraging me to ...
Where is Erlang used and why? [closed]
...
From Programming Erlang:
alt text http://bks8.books.google.com/books?id=Qr_WuvfTSpEC&printsec=frontcover&img=1&zoom=5&sig=ACfU3U2F4YY4KqO0vCuZ4WEZjdE2yFFvvg
Many companies are using Erlang in their production systems:
• Amazon uses Erlang to implement SimpleDB, providing data...
Should I use Python 32bit or Python 64bit
...rio, the 64 bits performs better with the inconvenient that John La Rooy said; if not, stick with the 32 bits.
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Folder structure for a Node.js project
...xpress)
/public contains all static content (images, style-sheets, client-side JavaScript)
/assets/images contains image files
/assets/pdf contains static pdf files
/css contains style sheets (or compiled output by a css engine)
/js contains client side JavaScript
/controllers contain all your ex...
How to get exit code when using Python subprocess communicate method?
...the child was terminated by signal N (Unix only).
So you can just do (I didn't test it but it should work):
import subprocess as sp
child = sp.Popen(openRTSP + opts.split(), stdout=sp.PIPE)
streamdata = child.communicate()[0]
rc = child.returncode
(*) This happens because of the way it's impl...
What is this crazy C++11 syntax ==> struct : bar {} foo {};?
...e a bog-standard abstract UDT (User-Defined Type):
struct foo { virtual void f() = 0; }; // normal abstract type
foo obj;
// error: cannot declare variable 'obj' to be of abstract type 'foo'
Let's also recall that we can instantiate the UDT at the same time that we define it:
struct foo { foo() ...
Plot logarithmic axes with matplotlib in python
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First of all, it's not very tidy to mix pylab and pyplot code. What's more, pyplot style is preferred over using pylab.
Here is a slightly cleaned up code, using only pyplot functions:
from matplotlib import pyplot
a = [ pow(10,i) for i in range(10) ]...
How to get the error message from the error code returned by GetLastError()?
...rorAsString()
{
//Get the error message, if any.
DWORD errorMessageID = ::GetLastError();
if(errorMessageID == 0)
return std::string(); //No error message has been recorded
LPSTR messageBuffer = nullptr;
size_t size = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMA...
How to see if an object is an array without using reflection?
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Thanks, it didn't realize it's that simple. Thought insstanceof couldn't be used straightforward with T[] :(
– edbras
Apr 28 '10 at 7:44
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Reset the database (purge all), then seed a database
... and then recreates the database and includes your seeds.rb file.
http://guides.rubyonrails.org/migrations.html#resetting-the-database
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