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How to implement a rule engine?
..."Contains", "C#" )
};
// compile the rules once
var compiledRules = rules.Select(r => CompileRule(r)).ToList();
public bool MatchesAllRules(User user)
{
return compiledRules.All(rule => rule(user));
}
Here is the implementation of BuildExpr:
Expression BuildExpr(Rule r, ParameterExpress...
How to do date/time comparison
...lso occurs within a range of times. In this model, I could not simply just select the oldest date, youngest time/latest date, latest time and Unix() seconds compare them. I'd really appreciate any suggestions.
...
How do you disable the unused variable warnings coming out of gcc in 3rd party code I do not wish to
...
If you're using gcc and want to disable the warning for selected code, you can use the #pragma compiler directive:
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-variable"
( your problematic library includes )
#pragma GCC diagnostic pop
For code you contro...
How to pip or easy_install tkinter on Windows
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When installing make sure that under Tcl/Tk you select Will be installed on hard drive. If it is installing with a cross at the left then Tkinter will not be installed.
The same goes for Python 3:
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Subscript and Superscript a String in Android
... HTML, that is creating a Spanned, which TextViews do support. Essentially CharSequences with style information.
– Dandre Allison
Apr 20 '12 at 17:21
1
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Changing Font Size For UITableView Section Headers
...ve answer but I only want to change the font to limit the size when a user selected font (accessibility) exceeds a certain size (so, not all of the time). I believe I need to check and possibly change the font in willDisplayHeaderView, so is there a way I could recalc the view height if the font is ...
Deleting multiple elements from a list
...; del a[0:3:2]
>>> a
[1, 3, 4]
This doesn't cover any arbitrary selection, of course, but it can certainly work for deleting any two items.
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How do RVM and rbenv actually work?
... practical difference between RVM and rbenv is when the version of Ruby is selected.
rbenv:
rbenv adds a shim to the start of your path, a command with the same name as Ruby. When you type ruby at a command line the shim is run instead (because it is also called "ruby" and comes first in the path)...
Looping through a hash, or using an array in PowerShell
... keys in a hash table is not determined - the [ordered] attribute triggers selection of the different implementation.
– user2864740
Jul 10 '19 at 19:42
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postgresql COUNT(DISTINCT …) very slow
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You can use this:
SELECT COUNT(*) FROM (SELECT DISTINCT column_name FROM table_name) AS temp;
This is much faster than:
COUNT(DISTINCT column_name)
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