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What differs std::to_string() from static_cast<std::string>()? [duplicate]
11/21/2024 by coolcoder2089
While on LearnCpp.com, I stumbled across a function called std::to_string(), but the tutorial didn't really elaborate on what it exactly did different than static_cast(), so now I'm confused. Also, std::string is a type, right? I attempted to use them and got a compiler error: 'static_cast': cannot convert from 'char' to […]
two same insert order‘s unordered_map，if the Iterate order are the same? [closed]
11/21/2024 by user14542318
logic like that: #include #include #include using namespace std; void insert_map(std::unordered_map& map, int num) { for(int i = 0; i < num; i++) { map.emplace(i % 13 * i, i); } } int main() { for(int k = 0; k < 10000; ++k) { std::unordered_map x1, x2; std::thread t1(insert_map, std::ref(x1), […]
OpenCV Template Matching for Playing Cards
11/21/2024 by Michael Chourdakis
For my bridge training lessons I 'm trying to analyse a deal played in Bridge Base Online, by capturing the image and then try to find where are the 52 cards. The reference image is this one (capture.jpg) And I have also 52 images (41x68) of the cards, like the […]
Does it possible to reduce cache miss when visit large size vector in sequence?
11/21/2024 by roderick
I tring reduce cache miss when visiting a large array in sequence. The array size of about 10 million. I do not know if it possible to reduce cache miss as much as possible ? There are two arrayes: one is raw array loaded from data file (ds_append_), another(ds_) will […]
How can I implement a function to call any templated lambda function?
11/21/2024 by NoEvaa
I have a value_t to wrap a value as a type: template struct value_t { static constexpr auto value = _v; }; I can use take_off to extract the type and value: template struct take_off { using result = T; }; template struct take_off { static constexpr auto result = […]
Can I use Xcode to code for the VEX V5 Brain with PROS (3.8.0)?
11/21/2024 by Putty
I'm currently working with the VEX V5 Brain and want to use Xcode for development with PROS (version 3.8.0) because I prefer native operation (I use a Mac). From my research, it seems like most of the documentation and community discussions around PROS and VEX robotics development suggest using Python […]
Collision doesn't work under very specific circumstances
11/21/2024 by jg1121
This is my player's update function: void update() { IsOnWall = false; IsOnFloor = false; int collide[4] = { collidelist(Rect{pos.x, pos.y + vel.y, hitbox.width, vel.y + 1}, Stillbodies), collidelist(Rect{pos.x, pos.y + hitbox.height, hitbox.width, vel.y - 1}, Stillbodies), collidelist(Rect{pos.x + vel.x, pos.y + 1, vel.x - 1, hitbox.height - 1}, Stillbodies), […]
C++ find results process in hung state. Invokes nanosleep in a separate thread. Why? [closed]
11/21/2024 by RajSanpui
Recently we noticed, invoking find is resulting in process at hung state, when invoked pstack with hung process ID to print the stacktrace, it shows invocation of kpucpincrtime followed by nanosleep. Why should this happen? Or is it a bug in the libc ? myuserp@test /trvapps/fnhome/psfnp58/ps_home8.60.15/pt/ps_home8.60.15 $ pstack 12585 Thread […]
Find the lowest value variable and run specific functions per variable [closed]
11/21/2024 by GLnoob
My question is a somewhat fundamental one for C++. I am trying to achieve the following: Given three variables: int x = 5; int y = 9; int z = 3; Determine which variable has the lowest value integer then run a specific function dependent upon which variable is lowest: […]
Does ArrayFire have a popcount or bitcount function?
11/21/2024 by Ben H
I am trying to move away from OpenCL and CUDA into ArrayFire. One of my functions uses the GPU's popcount() to make pre-processing data easier. But I can't find it anywhere in the list of functions in ArrayFire. OpenCL has popcount, CUDA has popc, and there is the builtin_popcount for […]

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