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c++ boost::multi_index composite keys efficiency - c++1y / stl - 清泛IT社区，为创新赋能！
Long time reader first time poster! I'm playing around with the boost::multi_index container stuff and have a rather in-depth question that hopefully a boost or C++ container expert might know (my knowledge in C++ containers is pretty basic). For reference, the boost documentation on composite keys ...
How do I remove all HTML tags from a string without knowing which tags are in it?
...e(input, "<.*?>", String.Empty);
}
Be aware that this solution has its own flaw. See Remove HTML tags in String for more information (especially the comments of @mehaase)
Another solution would be to use the HTML Agility Pack.
You can find an example using the library here: HTML agility pac...
Is the C# static constructor thread safe?
...cts/static-constructors
The implementation shown is thread safe for the initial construction, that is, no locking or null testing is required for constructing the Singleton object. However, this does not mean that any use of the instance will be synchronised. There are a variety of ways that this c...
Repeat table headers in print mode
Is it possible in CSS using a property inside an @page to say that table headers (th) should be repeated on every page if the table spreads over multiple pages?
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Sankey Diagrams in R?
I am trying to visualize my data flow with a Sankey Diagram in R.
10 Answers
10
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Change Screen Orientation programmatically using a Button
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Yes it is implementable!
ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
setRequestedOrientation(ActivityInfo.SCREEN_ORIE...
Efficient list of unique strings C#
...duplicates?
I was thinking a dictionary may be best inserting strings by writing dict[str] = false; and enumerating through the keys as a list. Is that a good solution?
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How do you kill all current connections to a SQL Server 2005 database?
...ight get an error
use master
ALTER DATABASE YourDatabase SET SINGLE_USER WITH ROLLBACK IMMEDIATE
--do you stuff here
ALTER DATABASE YourDatabase SET MULTI_USER
share
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improve this answer
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How to make the tab character 4 spaces instead of 8 spaces in nano?
When I press TAB in nano editor, the cursor will jump with 8 spaces like this:
6 Answers
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json_encode sparse PHP array as JSON array, not JSON object
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You are observing this behaviour because your array is not sequential - it has keys 0 and 2, but doesn't have 1 as a key.
Just having numeric indexes isn't enough. json_encode will only encode your PHP array as a JSON array if your PHP array is sequential - that is, if its keys are 0, 1, 2, 3, ....