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top nhà cái uy tín on ..I..03/09/2025
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CUDA Dynamic Parallelism Synchronization (CUDA > 11.6)
03/09/2025 by ug0x01
I need to use a function like cudaDeviceSynchronize to wait for a kernel to finish execution. However after version 11.6, it is no longer possible to use any form of synchronization within device functions. How can we synchronize subkernels in device function? Here's the code that I'm trying to run: […]
Range Encoder is incorrectly decoding, can anyone identify is the encoder bad, just the decoder? If so how to fix?
03/09/2025 by Dov
I wrote the following range encoder code, and build a simple test. Since it isn't reconstructing the right values, I built a debug function to display the state of the encoder/decoder. First, here is the output showing the test data, and the state of the encoder and decoder as it […]
Why is `operator=` automaticly casting to `const type`
03/09/2025 by Stas Badzi
When I use this code: #include "promise.hpp" #include using namespace std; int main() { stsb::promise tstint = stsb::promise(); thread waitthr = thread([tstint]() { // do some work tstint = 27; }); waitthr.detach(); // wait for result and do smth with it } with this class: #include #include #include namespace stsb […]
Why the keyword "virtual" is used in classes on whose it has no effect?
03/09/2025 by M. Saamin Rahman
Consider the following C++ code: class A { public: int i; } class B: virtual public A{}; class C: virtual public A{}; class D: public B, public C{}; int main() { D obj; obj.i = 0; return 0; } The code is the classic example of virtual inheritance handling diamond […]
Why can I pass a function return 64bit int as hasher?
03/09/2025 by iouvxz
#include #include #include using namespace std; class point { public: float x, y; point() = default; point(float _x, float _y) { x = _x, y = _y; } }; struct hash_point { uint64_t operator()(const point& p) const { return uint64_t(p.x) + uint64_t(p.y); } }; bool operator==(const point& p, const point& […]
confused about printf buffering rule in CUDA global function
03/08/2025 by PkDrew
The code below always prints out "Hello from the start" before anything else, and "Hello from the end" after anything else, why is that? Code: #include #include #include #include #include "cuda_runtime.h" #include "device_launch_parameters.h" __global__ void add1InGPU( int *devArr, int n, int nx ) { int ix = blockIdx.x * blockDim.x […]
Store value category of pointed-to object (for later deref)
02/20/2025 by glades
Ok this might be a bit difficult to explain: I want to call a function hello that has an overload for either an rvalue or an lvalue ref of type Json. This Json object is converted from a JsonKey using the operator Json() conversion overloads. But here's the twist: I […]
What is the difference between using GetAsyncKeyState() by checking with its return value as -32767 and 0x8000?
11/18/2020 by Krapnix
I am extremely confused by the sheer amount of how many different answers there are about GetAsyncKeyState(), I know what it does, but the confusing part is it's return value. I've seen many different examples on how people use this, but the main two are the following: First: if (GetAsyncKeyState(KEY) […]
Qt Interface freeze on background task
12/04/2014 by melanholly
I have an entertaining problem to solve. I use Qt 5 for one of my projects for reading information on the network. I read modbus devices and stuff, but the real problem comes when the network isn't available. The interface freezes and I can't interact with it. The network stuff […]
QWidget paintEvent stop being called without reason
11/25/2014 by Momergil
I'm finding a very strange situation while updating a QWidget in one of my Qt applications. What happens is that suddenly the widget's paintEvent(QEvent*) stops being called when the widget->update() method is called without any warning or command. My application, working in Embedded Linux with Qt 4.8.5 for ARM, has […]

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