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What are fail-safe & fail-fast Iterators in Java
...e usual java.util conventions in that their Iterators and Spliterators provide weakly consistent rather than fast-fail traversal."
Typically, weak consistency means that if a collection is modified concurrently with an iteration, the guarantees of what the iteration sees are weaker. (The details ...
Unique BooleanField value in Django?
...
Whenever I've needed to accomplish this task, what I've done is override the save method for the model and have it check if any other model has the flag already set (and turn it off).
class Character(models.Model):
name = models.CharField(max_length=255)
is_the_chosen_one = models.Boo...
Pass a parameter to a fixture function
... py.test to test some DLL code wrapped in a python class MyTester.
For validating purpose I need to log some test data during the tests and do more processing afterwards. As I have many test_... files I want to reuse the tester object creation (instance of MyTester) for most of my tests.
...
Google Maps zoom control is messed up
... used to zoom the map is messed up (it wasn't always like this). I have no idea what the cause is.
9 Answers
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How to make HTML input tag only accept numerical values?
...ue.
The input is not part of a form. Hence it doesn't get submitted, so validating during submission is not an option. I want the user to be unable to type in any characters other than numbers.
...
How to make a transparent HTML button?
... website and I thought of just using Photoshop to create backgrounds. I decided to do so only because in case I'd choose to change the button name easily by just editing the codes, I could just refer to the code. If I would construct buttons using Photoshop, I wouldn't be able to edit the Texts in t...
Most efficient way to check for DBNull and then assign to a variable?
...y;
return row[columnName] as string ?? string.Empty;
}
Usage:
int? id = row.GetValue<int>("Id");
string name = row.GetText("Name");
double? price = row.GetValue<double>("Price");
If you didn't want Nullable<T> return values for GetValue<T>, you could easily return d...
Difference between std::result_of and decltype
...with result_of without using binders or lambdas
– David Rodríguez - dribeas
Dec 22 '11 at 9:19
2
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Automating “enter” keypresses for bash script generating ssh keys
...works fine, although it looks like the dash from ssh-keygen got dropped - did you add that back in? {edited} Also - you can't run the script more than once - it changes the questions to confirm you want to overwrite the existing _rsa keyfile (so a y or n needs to be supplied)
–...
The 'packages' element is not declared
...makes it go away...
Edit in 2020: if you are viewing this warning, consider upgrading to PackageReference if you can
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