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how to resolve "symbol(s) not found for architecture x86_64" error in C++ VSCode
12/26/2024 by Lucas Alexander
I'm trying to write some simple C++ code in Visual Studio Code, but I keep getting the error "symbol(s) not found for architecture x86_64" whenever I try to make and call a class. Strangely, I do not get this error if I copy-paste my code into XCode, a different development […]
Converting a .PNG file from a Buffer in C++ to RGB Hex
12/26/2024 by Jason Trumbower
I am reading a PNG file from a website: String zoom = "5"; // Test Values String xmap = "30"; // Need to be adjusted String ymap = "30"; String serverPathMap = "http://tile.openweathermap.org/map/precipitation_new/" + zoom + "/" + xmap + "/" + ymap + ".png?" + "APPID=" + openWeatherMapApiKey; I'm […]
Can I solve this equation without looping for each value of x and y?
12/26/2024 by Youssef Emad
Given 2 positive integers c and n, find any 2 positive integer answers for x and y that satisfy the following equation: √x + √y = √z where z = c²n. Input The first line of the input contains a single integer t (1≤t≤105), the number of test cases. The […]
The template deduction for rvalue reference template and literal argument in C++
12/26/2024 by 吴yuer
I am reading about template argument deduction, the definition of P and A is: Template argument deduction attempts to determine template arguments (types for type template parameters Ti, templates for template template parameters TTi, and values for non-type template parameters Ii), which can be substituted into each parameter P to […]
How to correctly place and animate image on QML?
12/26/2024 by Toti
I started learning Qt and QML with a simple (and orrible :D) project of an Automotive Cluster Instrument interface. Below you can find the code for my QML interface: // CircularGauge.qml import QtQuick 2.15 import QtQuick.Controls 2.15 Item { id: root property real value: 0 property real maxValue: 100 property […]
Smart pointer produces inefficient compiled code
12/26/2024 by cpp is hard
I'm implementing a BST and I think it is a good idea to use unique_ptr to represent child node ownership. However I discovered that smart pointers cause compiler to prefer branching instead of branchless code (namely cmov). I'm using g++-13 to compile and Ubuntu 24.04.1 LTS. I use ternary operator […]
Can I write OpenCL kernels using some kind of C++, to run on NVIDIA GPUs, in 2024?
12/26/2024 by einpoklum
OpenCL has had a bumpy ride over the years w.r.t. to the prospects of using C++ to write kernels. First there was "OpenCL C++ kernel language", standardized with OpenCL v2.1 - but that did not quite catch, and AFAICR never got supported on NVIDIA GPUs; and then, with OpenCL 3.0 […]
UB with reinterpret_cast
12/26/2024 by IAmPropper
Am i allowed to do this safely, assuming func is only ever called with &container_instance.bar? struct foo_t { int val; }; struct bar_t { int val; }; struct container { foo_t foo; bar_t bar; }; void func(bar_t* b) { std::uintptr_t addr_of_b = reinterpret_cast(b); // get address of foo addr_of_b -= […]
Dequeued item exists but std::counting_semaphore::try_acquire() fails in single-consumer MPSC queue
12/26/2024 by Ervin Xie
I have a single-consumer, multiple-producer lock-free queue (MPSCQueue) combined with a std::counting_semaphore to notify the consumer when new items are enqueued. The consumer uses dequeue() to attempt fetching an item; if it succeeds, it calls sema.try_acquire() which I expect to succeed every time there’s actually an item in the queue. […]
solution to factorial problem using dynamic programming resulting in more time than simple recursion
12/26/2024 by Vishwas MIshra
I was just starting out with dynamic programming and tried solving factorial problem using the same, i used binary tree for underlying data structure, but when i thought of comparing it with normal recursion, the recursion solution is giving the result faster. I am using lenovo Ideapad3 with arch and […]

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