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Static variable inside of a function in C
...oo() to the return from foo(); so it would be re-initialized to 5 on every call.
The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over a...
Why would adding a method add an ambiguous call, if it wouldn't be involved in the ambiguity
...ong is completely unsurprising; the "ambiguous method" error heuristic basically picks any two methods from the candidate set if a best method cannot be determined. It is not very good at finding the "real" ambiguity, if in fact there is one.
One might reasonably ask why that is. It is quite tricky...
How to kill all processes with a given partial name? [closed]
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For any Mac users who find this answer, like I did, the Mac equivalent is killall -m my_pattern.
– Zev Eisenberg
Aug 18 '14 at 22:25
1
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Why are joins bad when considering scalability?
...ndex for any where clause on the tables. If you don't join, mysql will typically use only one index(which might not be the most efficient one), no matter how your where clause is formed.
– leeeroy
Apr 12 '10 at 17:29
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What is stack unwinding?
...the scope is of the function func.) This is done by the compiler inserting calls to destructors of automatic (stack) variables.
Now this is a very powerful concept leading to the technique called RAII, that is Resource Acquisition Is Initialization, that helps us manage resources like memory, datab...
Difference between a “coroutine” and a “thread”?
...eratively multitasked by pausing and resuming functions at set points, typically (but not necessarily) within a single thread.
Long answer: In contrast to threads, which are pre-emptively scheduled by the operating system, coroutine switches are cooperative, meaning the programmer (and possibly the...
what is the basic difference between stack and queue?
...t is the first one to come out. This is LIFO. Adding a piece of paper is called "pushing", and removing a piece of paper is called "popping".
Imagine a queue at the store. The first person in line is the first person to get out of line. This is FIFO. A person getting into line is "enqueued",...
The calling thread cannot access this object because a different thread owns it
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To add my 2 cents, the exception can occur even if you call your code through System.Windows.Threading.Dispatcher.CurrentDispatcher.Invoke(). The point is that you have to call Invoke() of the Dispatcher of the control that you're trying to access, which in some cases may not be...
How to call asynchronous method from synchronous method in C#?
I have a public async void Foo() method that I want to call from synchronous method. So far all I have seen from MSDN documentation is calling async methods via async methods, but my whole program is not built with async methods.
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Forced naming of parameters in Python
...o(10, forcenamed=20)
10 20
>>> foo(10, 20)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: foo() takes exactly 1 positional argument (2 given)
This can also be combined with **kwargs:
def foo(pos, *, forcenamed, **kwargs):
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