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mongoDB/mongoose: unique if not null
...e sparse if you just add a sparse : true to your schema. You have to drop and re-add the index. Dunno if that's expected or a bug.
– Adam A
Jun 5 '12 at 22:34
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using extern template (C++11)
...it will be instantiated somewhere else. It is used to reduce compile time and object file size.
For example:
// header.h
template<typename T>
void ReallyBigFunction()
{
// Body
}
// source1.cpp
#include "header.h"
void something1()
{
ReallyBigFunction<int>();
}
// source2....
Resolve Type from Class Name in a Different Assembly
... answered Aug 18 '10 at 13:03
Sandor DrieënhuizenSandor Drieënhuizen
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Waiting until two async blocks are executed before starting another block
When using GCD, we want to wait until two async blocks are executed and done before moving on to the next steps of execution. What is the best way to do that?
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When to use nested classes and classes nested in modules?
I'm pretty familiar with when to use subclasses and modules, but more recently I've been seeing nested classes like this:
5...
Add days to JavaScript Date
...become 9/1.
The problem with using setDate directly is that it's a mutator and that sort of thing is best avoided. ECMA saw fit to treat Date as a mutable class rather than an immutable structure.
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What is the difference between UTF-8 and Unicode?
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To expand on the answers others have given:
We've got lots of languages with lots of characters that computers should ideally display. Unicode assigns each character a unique number, or code point.
Computers deal with such number...
How to change past commit to include a missed file?
I have committed a change and forgot to add a file to the change set. After other commits, I realized the file is now missing from a HEAD^4 commit.
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What's an object file in C?
...object file is. What's the real difference between any other compiled file and an object file?
I would be glad if someone could explain in human language.
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When do you use POST and when do you use GET?
...or destructive actions such as creation (I'm aware of the irony), editing, and deletion, because you can't hit a POST action in the address bar of your browser. Use GET when it's safe to allow a person to call an action. So a URL like:
http://myblog.org/admin/posts/delete/357
Should bring you to ...