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Difference between events and delegates and its respective applications [closed]
...hen certain conditions are met. For example, my Stock class has a property called Limit, and it raises an event when the stock prices reaches the Limit. This notification is done via an event. Whether anyone actually cares about this event and subscribes to it is beyond the concern of the owner clas...
How to wait in a batch script? [duplicate]
...g to write a batch script and trying to wait 10 seconds between 2 function calls. The command:
6 Answers
...
HashMap and int as key
...ct> myMap = new HashMap<Integer, MyObject>();
Java will automatically autobox your int primitive values to Integer objects.
Read more about autoboxing from Oracle Java documentations.
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Difference between string and char[] types in C++
...0 character.
A string is a class that contains a char array, but automatically manages it for you. Most string implementations have a built-in array of 16 characters (so short strings don't fragment the heap) and use the heap for longer strings.
You can access a string's char array like this:
st...
Only variables should be passed by reference
... be converted to a plain value. More on this link.
– Callistino
Apr 1 '14 at 17:22
26
I like this...
How can I sort arrays and data in PHP?
...eturn 0;
}
}
Often, you will want to use an anonymous function as the callback. If you want to use a method or static method, see the other ways of specifying a callback in PHP.
You then use one of these functions:
usort
uasort
uksort
Again, they only differ in whether they keep key-value ass...
Transpose/Unzip Function (inverse of zip)?
...('d', 4)])
[('a', 'b', 'c', 'd'), (1, 2, 3, 4)]
The way this works is by calling zip with the arguments:
zip(('a', 1), ('b', 2), ('c', 3), ('d', 4))
… except the arguments are passed to zip directly (after being converted to a tuple), so there's no need to worry about the number of arguments ...
How to forward declare a C++ template class?
...
This is how you would do it:
template<typename Type, typename IDType=typename Type::IDType>
class Mappings;
template<typename Type, typename IDType>
class Mappings
{
public:
...
Type valueFor(const IDType& id) { // return value }
...
};
Note that the default ...
How to leave/exit/deactivate a Python virtualenv
... deactivate
which puts things back to normal.
I have just looked specifically again at the code for virtualenvwrapper, and, yes, it too supports deactivate as the way to escape from all virtualenvs.
If you are trying to leave an Anaconda environment, the command depends upon your version of cond...
$watch an object
I want to watch for changes in a dictionary, but for some reason watch callback is not called.
8 Answers
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