Questions tagged [c++]
C++ is a general-purpose programming language. Use this tag for questions about/utilizing C++. Do not also tag questions with [c] unless you have a good reason. C and C++ are different languages. Use a versioned tag such as [c++11], [c++20] etc. for questions specific to a standard revision.
396
questions
-1
votes
0
answers
79
views
What about association in c++ [duplicate]
I don't understand the concept of association in C++.
This is my code examples:
Association: Object A knows about object B. Class A depends from B but does NOT consist of it
Car
{
???
};
...
- 51
2
votes
0
answers
39
views
Attempting to write to disk and check the before and after availability of space using statvfs, but I see no change in blocks available
I am using statvfs to monitor my disk space. I run this program and see no changes in the amount of available blocks within my system, but when I run the df command I am able to see that there's disk ...
-2
votes
1
answer
64
views
Checking rvalue insert result for std::map gives unexpected results [duplicate]
Test code snippet below (CHECK is macro from test framework and works fine):
typedef std::map<int, double> M;
typedef M::value_type VT;
const VT v0;
M mm;
CHECK(mm.begin() == mm.insert(v0)....
- 485
0
votes
0
answers
34
views
Calling uwp library from unreal engine
I'm trying to use an sdk that is built for .NetCore which I got from Nuget. Since, I can't directly use it in Unreal Engine 4 (.NetFramework), I've made a UWP C# Class library as a wrapper, and I'm ...
0
votes
2
answers
110
views
C++ configurable classes at compile-time [closed]
Given a class like a counter, I want compile-time configurable features (e.g. on under/overflow call a callback, ...), eg.
on a embedded device, not all features are needed.
it should be lean also in ...
- 264
-1
votes
0
answers
37
views
C++ fstream cannot open file when you run the exe from a different directory [duplicate]
Using ifstream::open() to open a file takes the file path as a parameter. However, it is relative to the location you run the executable from, not to the location of the executable. This means that ...
- 1
0
votes
1
answer
36
views
c++ concurrency problem using semaphore: print in order
As an c++ concurrency exercise, I want to print letters A B C in that order, using semaphore. Here's my code:
binary_semaphore sem[] = { binary_semaphore(1), binary_semaphore(0), binary_semaphore(0) };...
- 1,055
0
votes
0
answers
27
views
How to read a 'CompactSVMModel' save in a .mat file from a C++/Qt program
I tried to save a machine learning model into a .mat file, and then read it from a Qt/C++ application.
Following the documentation, I managed to read files containing basic types like double or int.
...
-3
votes
0
answers
58
views
How do I create a window creation function for OpenGL? [closed]
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "OpenGL", NULL, NULL);
if (window == NULL) {
cout << "Failed to Create GLFW window" << endl;
...
0
votes
2
answers
90
views
How to binary search a std::vector BUT that return a RandomAccessIterator?
I'm looking for a log2(N) way of searching a std::vector and receive a RandomAccessIterator. I want it to work exactly as std::lower_bound() but return a RandomAccessIterator instead of a ...
- 43
0
votes
1
answer
52
views
Cython - How do we implement Tuple of Object in Cython?
I want to implement tuple of object in my cython project.
I couldn't find a way to implement in .pyx file so that I can use it in python.
You can check my get_language method for some reference.
And ...
- 3,352
1
vote
0
answers
89
views
Getting wrong CPU Processor ID with __cpuid() in Win 11 systems
I am facing an issue in getting CPU Processor ID with C++ code.
I used __cpuid() function as below:
#include <iostream>
#include <intrin.h>
int main()
{
unsigned __int32 regs[4];
...
- 11
0
votes
1
answer
25
views
LLVM linker does not work on MacOS while trying to develop on-chain Solana app (C++)
this is the error i get:
./account_logger.so ()
dyld[61282]: Library not loaded: @rpath/libLLVM.dylib
Referenced from: <A9E4BE2A-BF8D-3956-BCA9-E3BC5A6C9F9C> /Users/myusername/.local/share/...
0
votes
0
answers
30
views
C++ interface with only one implementation without performance overhead (for mocking in unit tests)
I am making a game engine in C++ and want to start implementing unit tests.
As far as I'm aware, you can only create mocks of pure virtual functions.
However, because I do not want to add needless ...
- 89
2
votes
0
answers
43
views
c++ ostream of object implicitly-convertible to string_view does not compile [duplicate]
I have a string-like class that is implicitly convertible to string_view. This works in almost all cases, but not for ostream inserters, where I need to explicitly write an ostream inserter for my ...
- 421