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What is the performance cost of having a virtual method in a C++ class?
...at matters is whether the function has been run before recently (making it more likely to be in cache), and whether your architecture can predict static (not virtual) branches and fetch those instructions into cache ahead of time. My PPC does not, but maybe Intel's most recent hardware does.
My ti...
iterating over and removing from a map [duplicate]
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Print “hello world” every X seconds
...rrect :\ The age of the two APIs aside, ScheduledExecutorService is simply more intuitively declarative. The use of TimeUnit as a parameter makes it much more clear what is occurring. Gone are the days of code like 5*60*1000 // 5 minutes.
– Tim Bender
Feb 14 '1...
Hand Coded GUI Versus Qt Designer GUI [closed]
...r buttons have the proper platform-layout.
You could probably do something more limited like xPad with limited Designer functionality.
I wouldn't think you could write something like OpenOffice solely with Designer but maybe that's not the point.
I'd use Designer as another tool, just like your te...
Why are we not to throw these exceptions?
...in your code, then you should always explicitly check for null and throw a more useful exception instead (for example ArgumentNullException). Similarly, IndexOutOfRangeExceptions occur when you access an invalid index (on arrays—not lists). You should always make sure that you don’t do that in t...
Showing which files have changed between two revisions
...o branches:
$ git diff --name-status firstbranch..yourBranchName
There is more options to git diff in the official documentation.
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With arrays, why is it the case that a[5] == 5[a]?
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I wonder if it isn't more like *((5 * sizeof(a)) + a). Great explaination though.
– John MacIntyre
Dec 19 '08 at 17:06
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Difference between \n and \r?
...er can move while the carriage is still going leftwards!-) Wikipedia has a more detailed explanation.
for character-mode terminals (typically emulating even-older printing ones as above), in raw mode, \r and \n act similarly (except both in terms of the cursor, as there is no carriage or roller;-)
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Incrementing in C++ - When to use x++ or ++x?
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unix domain socket VS named pipes?
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UNIX-domain sockets are generally more flexible than named pipes. Some of their advantages are:
You can use them for more than two processes communicating (eg. a server process with potentially multiple client processes connecting);
They are bidirectional;...