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In C++, what is a virtual base class?
I want to know what a " virtual base class " is and what it means.
11 Answers
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How to get the last N records in mongodb?
...our question, you need to sort in ascending order.
Assuming you have some id or date field called "x" you would do ...
.sort()
db.foo.find().sort({x:1});
The 1 will sort ascending (oldest to newest) and -1 will sort descending (newest to oldest.)
If you use the auto created _id field it has ...
ASP.NET Identity DbContext confusion
A default MVC 5 App comes with this piece of code in IdentityModels.cs - this piece of code is for all the ASP.NET Identity operations for the default templates:
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Determining if a number is either a multiple of ten or within a particular set of ranges
...the same logic, but by using the function we get a clearer idea of what it means.
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How to darken a background using CSS?
...o you should have a 'fallback color'. This color will be most likely be solid (fully opaque) ex:background:rgb(96, 96, 96). Refer to this blog for RGBa browser support.
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Using Emacs as an IDE
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You'll have to be specific as to what you mean by "the rest". Except for the object inspector (that I"m aware of), emacs does all the above quite easily:
editor (obvious)
compiler - just run M-x compile and enter your compile command. From there on, you can just ...
How do I parse JSON in Android? [duplicate]
How do I parse a JSON feed in Android?
3 Answers
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When to dispose CancellationTokenSource?
... uses "more impactful" which leaves it a bit vague. I'm interpreting it as meaning calling Dispose in those situations should be done, otherwise using Dispose is not needed.
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How to check if an email address exists without sending an email?
...get a 5.1.1 DSN. However, just because the email is not rejected, does not mean the user exists. Some server will silently discard requests like this to prevent enumeration of their users. Other servers cannot verify the user and have to accept the message regardless.
There is also an antispam tech...
How to get value of selected radio button?
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var rates = document.getElementById('rates').value;
The rates element is a div, so it won't have a value. This is probably where the undefined is coming from.
The checked property will tell you whether the element is selected:
if (document.getElementById...