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How to check if std::map contains a key without doing insert?
The only way I have found to check for duplicates is by inserting and checking the std::pair.second for false , but the problem is that this still inserts something if the key is unused, whereas what I want is a map.contains(key); function.
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MySQL - How to select data by string length
...HAR_LENGTH() will return the number of characters.
– András Szepesházi
Nov 1 '11 at 14:59
4
sel...
Aligning rotated xticklabels with their respective xticks
...l.set_y(label.get_position()[1] - (i % 2) * 0.075)
For more background and alternatives, see this post on my blog
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How to 'bulk update' with Django?
...it must be on an original QuerySet so you'll need to lean on the .filter() and .exclude() methods.
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How to iterate through a DataTable
....Text = row["ImagePath"].ToString();
}
...assumes the connection is open and the command is set up properly. I also didn't check the syntax, but it should give you the idea.
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JavaScript - cannot set property of undefined
...ever set d[a] to any value.
Because of this, d[a] evaluates to undefined, and you can't set properties on undefined.
If you add d[a] = {} right after d = {} things should work as expected.
Alternatively, you could use an object initializer:
d[a] = {
greetings: b,
data: c
};
Or you coul...
How do I delete an exported environment variable?
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unset is the command you're looking for.
unset GNUPLOT_DRIVER_DIR
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Git: Discard all changes on a diverged local branch
...branch blows away the branch's reflog. Resetting the branch, on the other hand not only preserves the reflog, but actually records the reset in the reflog. This makes the operation easily reversible later, if needed.
– Dan Moulding
Mar 30 '11 at 22:36
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instantiate a class from a variable in PHP?
... sort of thing you'll see wrapped up in a Factory pattern.
See Namespaces and dynamic language features for further details.
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Remove characters from NSString?
... i like it! I want to remove all special char in a phone number and keep only digits.
– karim
Mar 15 '11 at 16:23
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