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What uses are there for “placement new”?
...ted.
You may want to do this for optimization when you need to construct multiple instances of an object, and it is faster not to re-allocate memory each time you need a new instance. Instead, it might be more efficient to perform a single allocation for a chunk of memory that can hold multiple obj...
How to un-commit last un-pushed git commit without losing the changes
...ven't pushed changes yet you can do next.
Go to Version control window (Alt + 9/Command + 9) - "Log" tab.
Right-click on a commit before your last one.
Reset current branch to here
pick Soft (!!!)
push the Reset button in the bottom of the dialog window.
Done.
This will "uncommit" your chan...
How to hide close button in WPF window?
...
WPF doesn't have a built-in property to hide the title bar's Close button, but you can do it with a few lines of P/Invoke.
First, add these declarations to your Window class:
private const int GWL_STYLE = -16;
private const int WS_SYSMENU = 0x80...
How to calculate the CPU usage of a process by PID in Linux from C?
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You need to parse out the data from /proc/<PID>/stat. These are the first few fields (from Documentation/filesystems/proc.txt in your kernel source):
Table 1-3: Contents of the stat files (as of 2.6.22-rc3)
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What is the most elegant way to remove a path from the $PATH variable in Bash?
.../g/i"
$ echo ${a}
/a/b/c/d/e:/a/b/c/d/f:/a/b/c/g:/a/b/c/d/g/i
## Remove multiple (any directory with a: all of them)
$ echo ${a} | awk -v RS=: -v ORS=: '/a/ {next} {print}'
## Works fine all removed
## Remove multiple including last two: (any directory with g)
$ echo ${a} | awk -v RS=: -v ORS=: '/...
How can I get a precise time, for example in milliseconds in Objective-C?
...syncing to external time sources, so you wouldn't be able to trust the result. You really want a monotonically increasing clock, don't you?
– Kristopher Johnson
Sep 19 '12 at 11:12
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What is Ruby's double-colon `::`?
...her hand C++ (and Ruby) use :: for namespace resolution such as std::cout << "Hello World!";
– Jerry Fernholz
Jun 9 '10 at 20:29
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Where is array's length property defined?
We can determine the length of an ArrayList<E> using its public method size() , like
7 Answers
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Array.Copy vs Buffer.BlockCopy
...ar in performance to Buffer.BlockCopy(). Buffer.BlockCopy is consistently < 10% faster for me when dealing with 640 element byte arrays (which is the sort I'm most interested in). But you should do your own testing with your own data, because it'll presumably vary depending on the data, data type...
Reference: Comparing PHP's print and echo
...turn value for print is 1, as follows:
ZVAL_LONG(&EX_T(opline->result.var).tmp_var, 1);
(see here for reference)
The return value is a convenience should one wish to use print in a conditional expression. Why 1 and not 100? Well in PHP the truthiness of 1 or 100 is the same, i.e. true, w...