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Why does C++11's lambda require “mutable” keyword for capture-by-value, by default?
...a function object should produce the same result every time it's called. This is the difference between an object orientated function and a function using a global variable, effectively.
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How to generate a random integer number from within a range
This is a follow on from a previously posted question:
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Nullable vs. int? - Is there any difference?
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No difference.
int? is just shorthand for Nullable<int>, which itself is shorthand for Nullable<Int32>.
Compiled code will be exactly the same whichever one you choose to use.
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Absolute vs relative URLs
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In general, it is considered best-practice to use relative URLs, so that your website will not be bound to the base URL of where it is currently deployed. For example, it will be able to work on localhost, as well as on your public domain, ...
Check for installed packages before running install.packages() [duplicate]
I have an R script that is shared with several users on different computers. One of its lines contains the install.packages("xtable") command.
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Two submit buttons in one form
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answered Feb 13 '09 at 21:48
GregGreg
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How to extract text from a PDF? [closed]
...ing the text and images from a PDF?
We need to be able to get at text that is contained in pre-known regions of the document, so the API will need to give us positional information of each element on the page.
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What is the difference between ManualResetEvent and AutoResetEvent in .NET?
I have read the documentation on this and I think I understand. An AutoResetEvent resets when the code passes through event.WaitOne() , but a ManualResetEvent does not.
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What is the advantage of using abstract classes instead of traits?
What is the advantage of using an abstract class instead of a trait (apart from performance)? It seems like abstract classes can be replaced by traits in most cases.
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Is there a way to detect if a browser window is not currently active?
I have JavaScript that is doing activity periodically. When the user is not looking at the site (i.e., the window or tab does not have focus), it'd be nice to not run.
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