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What is the correct way of using C++11's range-based for?
...x << ' ';
}
the output is something like:
[... copy constructor calls for vector<X> initialization ...]
Elements:
X copy ctor.
1 X copy ctor.
3 X copy ctor.
5 X copy ctor.
7 X copy ctor.
9
As it can be read from the output, copy constructor calls are made during range-based for l...
Disable messages upon loading a package
...y R script is being used for further analysis I want to completely disable all of this output. How do I do that? Furthermore, I'd prefer to do it without having to modify ROCR at all, so that future users of this script don't have to do that either.
...
Python Nose Import Error
...stem path. The following fixed this:
source myvirtualenv/activate
pip install nose
which nosetests
/home/me/myvirtualenv/bin/nosetests
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How to convert string representation of list to a list?
... ast
>>> x = u'[ "A","B","C" , " D"]'
>>> x = ast.literal_eval(x)
>>> x
['A', 'B', 'C', ' D']
>>> x = [n.strip() for n in x]
>>> x
['A', 'B', 'C', 'D']
ast.literal_eval:
With ast.literal_eval, you can safely evaluate an expression node or a string c...
Difference between Destroy and Delete
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Basically destroy runs any callbacks on the model while delete doesn't.
From the Rails API:
ActiveRecord::Persistence.delete
Deletes the record in the database and freezes this instance to reflect that no changes should be ...
Regular expression \p{L} and \p{N}
...This syntax is specific for modern Unicode regex implementation, which not all interpreters recognize. You can safely replace \p{L} by {a-zA-Z} (ascii notation) or {\w} (perl/vim notation); and \p{N} by {0-9} (ascii) or {\d} (perl/vim). If you want to match all of them, just do: {a-zA-Z0-9}+ or {\w\...
How to locate the vimrc file used by vim editor?
...C variable is useful, as is looking at output of :scripts for full list of all loaded script files, including all vimrc files.
– Herbert Sitz
Jan 23 '12 at 20:38
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How to search in array of object in mongodb
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Use $elemMatch to find the array of particular object
db.users.findOne({"_id": id},{awards: {$elemMatch: {award:'Turing Award', year:1977}}})
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Rails: How to get the model class name based on the controller class name?
...ntroller
def index
# Equivalent of @house_buyers = HouseBuyer.find(:all)
objects = controller_name.classify.constantize.find(:all)
instance_variable_set("@#{controller_name}", objects)
end
end
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MAC addresses in JavaScript
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I concur with all the previous answers that it would be a privacy/security vulnerability if you would be able to do this directly from Javascript. There are two things I can think of:
Using Java (with a signed applet)
Using signed Javasc...