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What is the difference between an abstract function and a virtual function?

What is the difference between an abstract function and a virtual function? In which cases is it recommended to use virtual or abstract? Which one is the best approach? ...
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How to echo or print an array in PHP?

...($array) to get more information of the content in the array like datatype and length. 3) you can loop the array using php's foreach(); and get the desired output. more info on foreach in php's documentation website: http://in3.php.net/manual/en/control-structures.foreach.php ...
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WPF and initial focus

...you can read the remarks on msdn.microsoft.com/en-us/library/… to understand how the control you attach this to matters. – Joel McBeth Jul 1 '14 at 23:07 ...
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Set breakpoint in C or C++ code programmatically for gdb on Linux

... I don't know other debuggers, but gdb is pretty flexible about signal handling. – Cascabel Dec 1 '10 at 16:25 4 ...
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Does List guarantee insertion order?

...ly the List could re-order the collection any time after an item was added and that statement would still be valid. I don't want to get nit-picky about it, but if a manager or QA really made me defend this position, I wouldn't feel very confident with just that quote. – tehDorf...
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Removing double quotes from variables in batch file creates problems with CMD environment

Can anybody help with effective and safe way of removing quotes from batch variables? 11 Answers ...
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Can I use a binary literal in C or C++?

... 2 formatting with STL streams (since setbase will only honour bases 8, 10 and 16), but you can use either a std::string version of itoa, or (the more concise, yet marginally less efficient) std::bitset. #include <boost/utility/binary.hpp> #include <stdio.h> #include <stdlib.h> #i...
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Move entire line up and down in Vim

...++, I can use Ctrl + Shift + Up / Down to move the current line up and down. Is there a similar command to this in Vim? I have looked through endless guides, but have found nothing. ...
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How to improve Netbeans performance?

Is there a real way to get Netbeans to load and work faster? 29 Answers 29 ...
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Find a private field with Reflection?

... Use BindingFlags.NonPublic and BindingFlags.Instance flags FieldInfo[] fields = myType.GetFields( BindingFlags.NonPublic | BindingFlags.Instance); ...