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Legality of COW std::string implementation in C++11
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It's not allowed, because as per the standard 21.4.1 p6, invalidation of iterators/references is only allowed for
— as an argument to any standard library function taking a reference
to non-const basic_string as an argument.
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Recursive Lock (Mutex) vs Non-Recursive Lock (Mutex)
POSIX allows mutexes to be recursive. That means the same thread can lock the same mutex twice and won't deadlock. Of course it also needs to unlock it twice, otherwise no other thread can obtain the mutex. Not all systems supporting pthreads also support recursive mutexes, but if they want to be P...
How to read attribute value from XmlNode in C#?
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To expand Konamiman's solution (including all relevant null checks), this is what I've been doing:
if (node.Attributes != null)
{
var nameAttribute = node.Attributes["Name"];
if (nameAttribute != null)
return nameAttribute.Value;
throw new InvalidOp...
How can I disable a button on a jQuery UI dialog?
...ou have it), you can use it to disable the button and update the state visually, like this:
$(".ui-dialog-buttonpane button:contains('Confirm')").button("disable");
You can give it a try here...or if you're on an older version or not using the button widget, you can disable it like this:
$(".ui-...
How to replace a string in multiple files in linux command line
...is appended to the old file names. So sed -i .bak 's/foo/bar/g' *.xx moves all .xx files to the equivalent .xx.bak name and then generates the .xx files with the foo→bar substitution.
– Anaphory
Oct 4 '14 at 22:35
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Hash collision in git
What would actually happen if I had a hash collision while using git?
9 Answers
9
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NoSql vs Relational database
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Not all data is relational. For those situations, NoSQL can be helpful.
With that said, NoSQL stands for "Not Only SQL". It's not intended to knock SQL or supplant it.
SQL has several very big advantages:
Strong mathemat...
How to update a git clone --mirror?
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@Magnus Skog: Great. Thanks! Is this all? Do I need another commmand, like git fetch? Or git remote update alone will do it all?
– J. Bruni
May 27 '11 at 11:40
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How can I make an “are you sure” prompt in a Windows batchfile?
...other and back for me. Only thing is as much as it helps me I keep accidentally selecting that command off my command buffer and mass overwriting uncommited changes.
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Java JTable setting Column Width
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What happens if you call setMinWidth(400) on the last column instead of setPreferredWidth(400)?
In the JavaDoc for JTable, read the docs for doLayout() very carefully. Here are some choice bits:
When the method is called as a result of the ...