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#pragma once vs include guards? [duplicate]
I'm working on a codebase that is known to only run on windows and be compiled under Visual Studio (it integrates tightly with excel so it's not going anywhere). I'm wondering if I should go with the traditional include guards or use #pragma once for our code. I would think letting the compiler de...
Angular.js ng-repeat across multiple tr's
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It's a bit after the fact now, but Angular 1.2 introduced the ng-repeat-start and ng-repeat-end directives to allow you to iterate over multiple elements.
– Onite
Nov 22 '13 at 15:03
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How do I grep recursively?
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It is good to know that "-i" would make it case insensitive, and "-n" also include the line number for each matched result.
– Sadegh
Jan 23 '15 at 12:02
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Better explanation of when to use Imports/Depends
...function.
This is why using namespaces is such a good practice, why it is now enforced by CRAN, and (in particular) why using "Imports" is safer than using "Depends".
Edited to add an important caveat:
There is one unfortunately common exception to the advice above: if your package relies on a ...
Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference
...being assigned or passed as an argument. That is what we call a callback.
Now the question is, when is that callback called?
It depends on the case. Let's try to trace some common behavior again:
img.onload may be called sometime in the future, when (and if) the image has successfully loaded.
se...
Printing without newline (print 'a',) prints a space, how to remove?
...ly make a single call to print. Note that string concatenation using += is now linear in the size of the string you're concatenating so this will be fast.
>>> for i in xrange(20):
... s += 'a'
...
>>> print s
aaaaaaaaaaaaaaaaaaaa
Or you can do it more directly using sys.std...
Select columns from result set of stored procedure
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It also doesn't work when you don't know the table definition
– Ian Boyd
Nov 10 '10 at 15:09
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Entity Framework DateTime and UTC
...ue(entity, DateTime.SpecifyKind(dt.Value, attr.Kind));
}
}
}
Now hook that attribute up to your EF context:
public class MyContext : DbContext
{
public DbSet<Foo> Foos { get; set; }
public MyContext()
{
((IObjectContextAdapter)this).ObjectContext.ObjectMater...
Ruby, remove last N characters from a string?
...in a fast and readable manner.
The docs on the methods are here.
If you know what the suffix is, this is idiomatic (and I'd argue, even more readable than other answers here):
'abc123'.delete_suffix('123') # => "abc"
'abc123'.delete_suffix!('123') # => "abc"
It's even significantly...
How can I generate a list or array of sequential integers in Java?
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The API now requires code similar to this: ContiguousSet.create(Range.closed(1, count), DiscreteDomain.integers()
– Ben
Aug 3 '14 at 17:37
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