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How can I know which parts in the code are never used?
...way, like written but never read)
the global one: functions that are never called, global objects that are never accessed
For the first kind, a good compiler can help:
-Wunused (GCC, Clang) should warn about unused variables, Clang unused analyzer has even been incremented to warn about variable...
C++ Object Instantiation
...say, when the variable is declared on the stack, its destructor is automatically called when it goes out of scope, which is your main tool for tracking resource lifetime and avoiding leaks.
So in general, every time you need to allocate a resource, whether it's memory (by calling new), file handles...
Copy a file in a sane, safe and efficient way
...worth the extra cost. If we were doing it a lot, better to fall back on OS calls to the file system. I am sure boost has a copy file method in its filesystem class.
There is a C method for interacting with the file system:
#include <copyfile.h>
int
copyfile(const char *from, const char *to...
What is Linux’s native GUI API?
...phical user interface found on most Linux desktops is provided by software called the X Window System, which defines a device independent way of dealing with screens, keyboards and pointer devices.
X Window defines a network protocol for communication, and any program that knows how to "speak" this...
What is move semantics?
... you include this sentence) and meant the exact same object every time? We call expressions such as x "lvalues".
The arguments in lines 2 and 3 are not lvalues, but rvalues, because the underlying string objects have no names, so the client has no way to inspect them again at a later point in time....
Singleton pattern in nodejs - is it needed?
...
This has basically to do with nodejs caching. Plain and simple.
https://nodejs.org/api/modules.html#modules_caching
(v 6.3.1)
Caching
Modules are cached after the first time they are loaded. This means
(among other things) th...
What does the “>” (greater-than sign) CSS selector mean?
...
> is the child combinator, sometimes mistakenly called the direct descendant combinator.1
That means the selector div > p.some_class only selects paragraphs of .some_class that are nested directly inside a div, and not any paragraphs that are nested further within.
An i...
What is a clean, pythonic way to have multiple constructors in Python?
... kwargs: {'param': 3}
http://docs.python.org/reference/expressions.html#calls
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How to position a div in the middle of the screen when the page is bigger than the screen
... using something similiar to the following to get a div positioned in the middle of the screen:
16 Answers
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How to call erase with a reverse iterator
...ike it would be a problem if ++i got you to past the last element. can you call erase on end()?
– stu
Mar 14 '18 at 19:21
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