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How do malloc() and free() work?
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OK some answers about malloc were already posted.
The more interesting part is how free works (and in this direction, malloc too can be understood better).
In many malloc/free implementations, free does normally not return the memory to the operating system (...
Checking if a folder exists using a .bat file [closed]
...VAR%\NUL ECHO It's a directory
Replace %VAR% with your directory. Please read the original answer because includes details about handling white spaces in the folder name.
As foxidrive said, this might not be reliable on NT class windows. It works for me, but I know it has some limitations (which ...
How do I find Waldo with Mathematica?
...g Waldo. Take one with the highest probability.
This is how OCR, ZIP code readers, and strokeless handwriting recognition work today. Basically you know the answer is there, you know more or less what it should look like, and everything else may have common elements, but is definitely "not it", so ...
Remove all multiple spaces in Javascript and replace with single space [duplicate]
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i'm reading data in from a txt file (via AJAX), and @InfinitiesLoop regex worked fine but Josiah's didn't
– Jeff
Apr 23 '12 at 13:48
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SQLAlchemy: cascade delete
... @MiloradPop-Tosic I haven't used SQLAlchemy for over 3 years but reading the doc looks like passive_deletes=True is still the right thing.
– Alex Okrushko
Apr 8 '15 at 3:56
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How to pass objects to functions in C++?
...reasons. Sutter & Alexandrescu C++ Coding Standards is a great book to read and you can get quite a few of good advices, but it is not really a style guide. I don't know of any automated checker for style, other than humans and common sense.
– David Rodríguez - dribeas
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What is the fastest/most efficient way to find the highest set bit (msb) in an integer in C?
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Which one ? BSR or CNTLZ ? As I read the x86-timing.pdf referenced above, BSR is only slow on the Netburst Pentiums. I know nothing about PowerPC though.
– timday
Mar 23 '09 at 9:26
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Legality of COW std::string implementation in C++11
...st under this requirement, up until the time it is accessed, but that both read and write accesses would need to unshare it. Is that your reasoning?
– Ben Voigt
Mar 5 '15 at 15:00
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How to overload std::swap()
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@curiousguy: If reading the standard was just a simple matter of reading the standard, you’d be right :-). Unfortunately, the intent of the authors matters. So if the original intent was that ADL could or should be used, it’s underspec...
How to check if a file exists from inside a batch file [duplicate]
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The IF command is quite powerful. The output of IF /? will reward careful reading. For that matter, try the /? option on many of the other built-in commands for lots of hidden gems.
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