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Mercurial — revert back to old version and continue from there
...
hg update [-r REV]
If later you commit, you will effectively create a new branch. Then you might continue working only on this branch or eventually merge the existing one into it.
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Count the occurrences of DISTINCT values
...e? It is not clear what is purpose is? It seems it should work with out it if you where just reading it plainly.
– James
Sep 19 '11 at 15:46
19
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How to set initial size of std::vector?
... in my experience, it's fairly unusual for either of these to make a huge difference in performance--but either can affect correctness under some circumstances. In particular, as long as no reallocation takes place, iterators into the vector are guaranteed to remain valid, and once you've set the si...
ByteBuffer.allocate() vs. ByteBuffer.allocateDirect()
...ble for a nondirect
buffer to be the target of a native
I/O operation. If you pass a nondirect
ByteBuffer object to a channel for
write, the channel may implicitly do
the following on each call:
Create a temporary direct ByteBuffer
object.
Copy the content of the nondirect
bu...
Why does the Scala compiler disallow overloaded methods with default arguments?
... naming-scheme for the
generated methods which return default arguments. If you write
def f(a: Int = 1)
the compiler generates
def f$default$1 = 1
If you have two overloads with defaults on the same parameter
position, we would need a different naming scheme. But we want to k...
How to use the 'sweep' function
...e a matrix by row or by column, and the other input of the operation is a different value for each row / column. Whether you operate by row or column is defined by MARGIN, as for apply(). The values used for what I called "the other input" is defined by STATS.
So, for each row (or column), you will...
Why does typeof array with objects return “object” and not “array”? [duplicate]
...iour and spec in Javascript is the typeof Array is Object.
You can check if the variable is an array in couple of ways:
var isArr = data instanceof Array;
var isArr = Array.isArray(data);
But the most reliable way is:
isArr = Object.prototype.toString.call(data) == '[object Array]';
Since yo...
How to grep (search) committed code in the Git history
... --all)
git rev-list --all | xargs git grep <expression> will work if you run into an "Argument list too long" error.
If you want to limit the search to some subtree (for instance, "lib/util"), you will need to pass that to the rev-list subcommand and grep as well:
git grep <regexp> ...
MySQL Error 1093 - Can't specify target table for update in FROM clause
...
Update: This answer covers the general error classification. For a more specific answer about how to best handle the OP's exact query, please see other answers to this question
In MySQL, you can't modify the same table which you use in the SELECT part.
This behaviour is doc...
UITableView - change section header color
...thFrame:CGRectMake(0, 0, tableView.bounds.size.width, 30)] autorelease];
if (section == integerRepresentingYourSectionOfInterest)
[headerView setBackgroundColor:[UIColor redColor]];
else
[headerView setBackgroundColor:[UIColor clearColor]];
return headerView;
}
Swift:
func tableV...