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The template deduction for rvalue reference template and literal argument in C++
12/26/2024 by 吴yuer
I am reading https://en.cppreference.com/w/cpp/language/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 produce the type […]
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 […]
C++ syntax question about accessing members
12/26/2024 by feng lei
Why is it wrong to access the fun() function this way? I get this error: “C++ Operators -> and ->* Applied to Non-Pointer Types” I can't understand this error! class a { public: class b { struct c { void fun() {}; }; c _c[5]; c* operator[](int count) { return […]
trouble on making GNURADIO C++ OOT sync block
12/26/2024 by KIEN CHI NGUYEN
i'm trying to implement a block that process chunks of 512 bytes and return chunks of 480 bytes. At first i'm trying to work with 512 input/512 output instead to grasp the in/out mechanism of GNUradio. Here is my work function implementation: int cycle = 0; int test_sync_impl::work(int noutput_items, gr_vector_const_void_star […]
A likely MSVC compiler bug on short C++ codes (about 20+ lines to reproduce). How to avoid it?
12/26/2024 by Shufeng Zhang
#include // This win32 program gives wrong output: // when user inputs 1 to the program, it prints out 281474976710656 (2^48). but 0 is expected. // Reproduce Environment: // visual studio 2022 Platform Toolset v143 // Release Win32 // Optimization (default) (Maximum, Favor Speed) \O2 // Language Standard c++14 (default) […]

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