C++ - Страница 1248

I am trying to make a class template with non-type template parameter of pointer type, which has two specializations for const and not-const pointers.

This is my best attempt, accepted by Clang and GCC:

template struct A {}; template struct A;...

I few years back I tested QVector and std::vector side by side, and was living with the impression the two are in the same ballpark of performance, in fact in some cases QVector was edging out.

Until yesterday, when I ran a quick compliance test...

I have two snippets:

for (int i = 0; i 0 && arr 0 && arr

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I'm trying to rotate a portion of a bits in c++11 with

inline void rotateL(std::bitset& b, unsigned m, int lastStep) { b = b >> m | b

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I want to trigger a static_assert, when my base class does not implement a member function.

#include template struct AlwaysFalse : public std::false_type {}; struct B { template void foo(){} }; template struct A:T { auto foo(){ if constexpr...

I am trying to run a c++ program on a dev container(docker container). I have attached VS code to that container. The docker container is running SUSE SLES15 SP2. (image: registry.suse.com/suse/sle15:15.2) This is the program:

#include #include...

I'm trying to create a component for ESPHome.

I'm getting: ERROR ID esp32_esp32internalgpiopin_6 is already registered

With this config:

... external_components: - source: type: git url: ref: dev components: refresh: 3s spi: clk_pin: 18...

I am trying to build a simple C++ program with xlnt with GNU compiler and Visual Studio Code IDE. I have had some challenges with getting the build environment to include the xlnt libraries, and the problem may be related to that. The program is...

I am wondering if anyone could help me understand why I am getting an int here and not a double? My guess is it probably due to the fact the decimal part is just .00 but how can I make sure it writes it anyway. Thanks!

#include #include #include...

For the SSL communication with the certificate for the below C/C++ code link how to support the CA certificate (public key certificate which is exported from the site info)

WS_SSL_TRANSPORT_SECURITY_BINDING sslBinding = {}; // zero out the...

need an algorithm for compressing an image data which is encoded into base64 format and need to do this process on arduino uno

i tried the RLE algo but it is not woking as base64 not has many repeating charecters and also looked into huffman...

Below is my code that I'm trying to compile and run. (It's from chat gpt but that's just bc I'm testing stuff.)

I am working in RedPanda.

The code presents no errors or warnings, but when I run it, this is all that comes up. Command prompt that...

After finding the reason for why the following code works the way it does in C#, I tried the near identical code in C++ and got a different result, even though their stated orders of operations and their direction of evaluation for the matching...

I was doing an exercise in my textbook that asked us to output a vector's elements at even indices separated by asterisks. Then on a newline, do the same thing with the odd indices. So, if the vector contained 10 20 30 40 50 60, the output should...

Consider the following function

void removeOdd(list& li) { for(list::iterator it=li.begin(); it!=li.end(); it++) { if((*it)%2) it = li.erase(it); } } From my understanding of lists, where the return value is an iterator pointing to the element...

I have tried using CMake to build ccls many times and I have just about given so if anyone has a way to do it that would be mega helpful.

I am on Fedora Linux and I am using the repo to get ccls as the prebuilt binaries don't work.

Any help...

I am developing a program without the C runtime library (CRT) with C++ as a fun little challenge. As part of this challenge I ended up writing my own atexit() function which is called whenever main returns.

This function works as expected and...

As shown in the title, given an unsorted array (arr) and it's size (size) I'm asked to find the median of it without sorting.

My thought:

If the length of the array is odd then It would be easy to find the median by iterating over every...

I have seen a lot of similar posts, but tried every trick in the book and am still struggling. Everything was working fine, but after installing/removing wireshark with some components/disselectors it all got messed up. I don't remember exactly...

I have this code, but I need help to use OpenMP #pragmas to increase its speed. I want to parallelize the for loops over variables i and j. The values of n and m can be much larger, too. For example, n = 1000, m = 500.

My code:
for (int i = 0; i...

(Note: This question is about not having to specify the number of elements and still allow nested types to be directly initialized.)
This question discusses the uses left for a C array like int arr ;. On his answer, @James Kanze shows one of the...

I'm confused about how scoping and memory persistence works with std::vectors. Consider the following:

#include #include class Entity { std::string name; } class MyClass { std::vector class_vec; MyClass() { std::vector local_vec(100); class_vec =...

Suppose I have 2 meshes and I used one VBO for each mesh. The vertex attributes (position, normal, color) are contained in a struct:

struct Vertex { glm::vec3 position; glm::vec3 normal; glm::vec3 color; } and they are interleaved in the VBO;...

As it is known, declaring extern C to C++ function makes its name have C linkage, enabling C code to link.

My question is - are there other programming languages we can make C++ function names have linkage to, something like extern Lisp or extern...

I have written a code to encrypt according to AES 256 algorithm and it works to give me an output file but I realised that it hangs after running the EncryptDecryptString function and does not perform anything else after that. Why is this so? How...