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Default template arguments for function templates
... typename std::iterator_traits<Iterator>::value_type> >
void sort(Iterator beg, Iterator end, Comp c = Comp()) {
...
}
C++0x introduces them to C++. See this defect report by Bjarne Stroustrup: Default Template Arguments for Function Templates and what he says
The prohibitio...
Clojure differences between Ref, Var, Agent, Atom, with examples
...duce a short snip-it of the motivations for each:
start by watching this video on the notion of Identity and/or studying here.
Refs are for Coordinated Synchronous access to "Many Identities".
Atoms are for Uncoordinated synchronous access to a single Identity.
Agents are for Uncoordinated asynch...
vs
...l intention in C++98 was that you should use <cstdint> in C++, to avoid polluting the global namespace (well, not <cstdint> in particular, that's only added in C++11, but the <c*> headers in general).
However, implementations persisted in putting the symbols into the global namesp...
What is the proper declaration of main?
...common to see incorrect programs that declare main with a return type of void; this is probably the most frequently violated rule concerning the main function).
There are two declarations of main that must be allowed:
int main() // (1)
int main(int, char*[]) // (2)
In (1), there ...
Static variables in member functions
...is a non-template function. There will be only one copy of static int i inside the program.
Any instance of A object will affect the same i and lifetime of i will remain through out the program. To add an example:
A o1, o2, o3;
o1.foo(); // i = 1
o2.foo(); // i = 2
o3.foo(); // i = 3
o1.foo(); // ...
Callback to a Fragment from a DialogFragment
...{
int mStackLevel = 0;
public static final int DIALOG_FRAGMENT = 1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (savedInstanceState != null) {
mStackLevel = savedInstanceState.getInt("level");
}
}
@Override
public void onS...
Using Node.js only vs. using Node.js with Apache/Nginx
... webserver in front of Node.js:
Not having to worry about privileges/setuid for the Node.js process. Only root can bind to port 80 typically. If you let nginx/Apache worry about starting as root, binding to port 80, and then relinquishing its root privileges, it means your Node app doesn't have to...
How can I dynamically create derived classes from a base class
...f key not in argnames:
raise TypeError("Argument %s not valid for %s"
% (key, self.__class__.__name__))
setattr(self, key, value)
BaseClass.__init__(self, name[:-len("Class")])
newclass = type(name, (BaseClass,),{"__init__": __init__})
...
What do pty and tty mean?
... ls, the ls command is sending its output to a pseudo-terminal, the other side of which is attached to the SSH daemon.
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Can I have multiple :before pseudo-elements for the same element?
...can specify exactly what the browser should do in those cases. I can't provide a complete example including the content property here, since it's not clear for instance whether the symbol or the text should come first. But the selector you need for this combined rule is either .circle.now:before or ...