Signals | A lightweight signals and slots implementation | iOS library
kandi X-RAY | Signals Summary
kandi X-RAY | Signals Summary
A lightweight "signals and slots" implementation using fast delegates. When GUI programming in C++, delegates and the signals and slots paradigm can vastly simplify your code. It implements the Observer pattern while avoiding all the boilerplate code. I needed a lightweight and efficient implementation that I could just drop into my projects and use without adding weird macros, inheriting from crazy templates or having external dependencies. I wanted something simpler and more efficient than libsigc++, sigslot, and boost.signals. So I was overjoyed when I discovered a very novel and efficient implementation of delegates in C++ and I realized I could make use of these to create a signals and slots implementation that would be very non-intrusive.
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QUESTION
I want to create an entry on UserExtended model after registering an user on Django default user model.
here is UserExtended model:
...ANSWER
Answered 2021-Jun-14 at 15:45Django does not look for any file named signal.py
, etc. by default. Hence what is happening it that your signals are never registered (in fact the file you write them in is never run). The general solution to adding signals is to write them in a separate file and then import / register them in the app config's ready
method.
In the app in which you write signal.py
there should be a file apps.py
in which there should be a class inheriting from AppConfig
edit this class and add a ready
method to it and import your signals there:
QUESTION
I am creating multiple object of type QWidget_WindowContact at runtime. When I click the Increment or decrement buttons the value in the last generated object gets updated and not the value in the same object.
I am struggling to properly link the signals and slots, so that when multiple objects of the same type are generated at runtime the signal emitted by the button coressponds to the signal in the right object.
QWidget_WindowContact.h:
...ANSWER
Answered 2021-Jun-11 at 14:30You have
QUESTION
I have the following development which I'm working with the ElementTree and Pandas module in Python:
...ANSWER
Answered 2021-Jun-12 at 11:23I hope I'm understanding the questions correctly. my understanding is that
you want to dynamically produce the
extract_name_value()
function, and make it not as bulky in your code.Im sorry, but I failed to comprehend the
for i in signal_name: print(i)
part of the question. perhaps you can rephrase the question, and help me understand?
my solution to the extract_name_value()
part would be using the exec()
function.
it is a built-in solution for dynamic execution.
QUESTION
I have the following development that I am working on with the ElementTree and Pandas module in Python:
...ANSWER
Answered 2021-Jun-13 at 23:04you can extract the repetitive part into its own function that take as arguments the parts that change, like for example:
QUESTION
Tl Dr. If I were to explain the problem in short:
- I have signals:
ANSWER
Answered 2021-Jun-11 at 04:07Following code adds a memory to the signals which can be wiped using MultiSig.reset()
to reset the count of all signals to 0. The memory can be queried using MultiSig.query_memory(key)
to return the number of hits for that signal at that time.
For the memory function to work, I had to add unique keys to the signals to identify them.
QUESTION
I am currently trying to run a windowed CRQA in R using heart and respiration waveform signals. I have to run 94 windowed CRQA, where each signal has 20000 - 50000 data points. Hence the computational load is relatively high and takes forever. Therefore I am trying to get R to increase the memory size and use multiple cores. Both this does not seem to work with the folllowing code:
...ANSWER
Answered 2021-Jun-10 at 09:47You need to use clusterMap()
or another function from the parallel
package rather than base::Map
.
Look those options up with: ?parallel::clusterMap
.
You are also currently mixing things up by introducing registerDoParallel(cl)
, which is from the foreach
package. That would require you to then use foreach()
and its helper %dopar%
. If you do not use foreach()
then you do not need registerDoParallel(cl)
.
The relevant part of your code would look something like this with clusterMap()
. I've tidied it a bit but I can't test it on my machine.
QUESTION
I've recently started to use and customize awesomewm, and I'm really happy with how all components work together and with the related documentation.
Though I'm sometimes really disturbed when using the menu (awful.menu) and it's nature to block some actions. So I've wanted to add listener to the mouse::enter
and mouse::leave
signal to allow the widget to hide itself once the mouse leaves the widget area.
Something like:
...ANSWER
Answered 2021-Jun-09 at 15:41The menu is a complicated object. You can dig in its internal and access menu.wibox:connect_signal("mouse::enter", function() end)
, but this is only the top-level wibox. Submenus generate their own menu instance and they only create that dynamically.
Thus, there is no easy way to connect signals like this, sorry.
QUESTION
I have multiple power mosfet pwm controlled and connected to a single main power supply. Thee pwm signals operate all at the same frequency and their duty factor is determined otherwise and can change frequently. It can can vary between 0 and 100%. My PWM controller allows me to choose On time and off time independently for each signal.
I am looking for an efficient algorithm to determine the on time of each channel in order to minimize the peak power drawn from the power supply.
A trivial example: With 10 mosfet each one with a 10% duty factor the optimal solution will be to turn on each mosfet one at a time in sequence.
Any ideas out there on how to address this problem? Thanks
...ANSWER
Answered 2021-Jun-08 at 00:39Let the pulse width fractions (between 0 and 1) be p1, ..., pn. Let s0 = 0 and sn = sn−1 + pn be the prefix sums. Signal i should turn on at times si−1 mod 1 and end at times si mod 1.
This algorithm does what you want on the trivial example, since s0, s1, ..., sn−1, sn = 0, 1/10, ..., 9/10, 0.
For a less trivial example, suppose that we have signals at 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%. Then the pulses look like
QUESTION
I have a multithreaded program and eacch thread focuses on its own work. When a thread finishes its work, it will drive the event to the main thread.
So I want to use the pthread condition variable to implement the idea (i.e. pthread_cond_t and pthread_mutex_t). The data structure will be like:
...ANSWER
Answered 2021-Jun-07 at 18:19Yes, you can safely wait on a "compound predicate," where one signal means "this state changed or that state changed or some other state changed or ..."
In your case, those states are the event_v
flags you set. Presuming your main thread is in a loop, and that the event_v
flags are initialized to false
, it'd look something like this:
QUESTION
I'm trying to write a code in vhdl to create a 16 to 1 mux using 2 to 1 mux. I actually thought that to do this we may need 15 two to one multiplexers and by wiring them together and using structural model I wrote the code below. First I wrote a 2 to 1 mux:
...ANSWER
Answered 2021-Jun-06 at 23:54Virtual component binding using component declarations can either be explicit using a configuration specification to supply a binding indication, or rely on a default binding indication.
A default binding indication would rely on finding an entity declared in a reference library whose name matches the component name. That's not the case here, your entity is named MUX_2_1 (case insensitive) while the component name is mux2to1.
It's not illegal to have components unbound in VHDL, it's the equivalent of not loading a component in a particular location in a printed circuit or bread board, it simply produces no output which shows in simulation here as a 'U'.
Here the solutions could be to either change the name of the entity in both the entity declaration and it's architecture from MUX_2_1 to mux2to1, change the component declaration to MUX_2_1 or provide a configuration specification providing an explicit binding indication as a block declarative item in the architecture for mux16to1 of the form
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