c++ Questions
5
Solved
@robot_sherrick answered me this question, this is a follow-up question for his answer.
cv::SimpleBlobDetector in Opencv 2.4 looks very exciting but I am not sure I can make it work for more detai...
1
Solved
A requires-expression can introduce local parameters using a parameter list. If any of these parameters has void type, will the requires expression just yield false or shall it be hard compilation ...
Northeastwards asked 19/9 at 20:32
1
Solved
#include <memory>
#include <atomic>
#include <iostream>
#include <thread>
#include <cassert>
int main()
{
std::atomic<bool> flag = {false};
std::atomic<int&...
Calan asked 19/9 at 14:22
2
Solved
I've following issue. I'm tring to use native mechanism build in CMake for cross compilation. I prepared following toolchain.cmake file:
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR arm...
Ballottement asked 22/8, 2016 at 8:50
5
Solved
Let me use an example to explain the issue.
If we have a TextField like this,
TextField {
text: "0.0"
validator: DoubleValidator { bottom: -359.9;
top: 359.9;
decimals: 1;
notation: DoubleVa...
1
Suppose I am creating the following function:
double f(double const& x) { return x + x; }
This is how I like to place the const modifier, not like const double. However, Qt Creator automatic...
Broider asked 28/4, 2015 at 19:16
2
In the following if I use constexpr the compiler apparently the compiler says "expression must have a constant value", this happens on MSVC and GCC:
int main() {
constexpr auto nnn = {
...
Puberulent asked 19/9 at 7:56
6
Solved
A follow-up question to Memory leaks when calling ITK from Visual Studio DLL
I refined the problem to the simplest example.
struct A
{
public:
A()
{
mp_data = new int(0x42);
}
~A()
{
del...
Bausch asked 24/4, 2012 at 14:26
0
I'm trying to visualize on memory GDI+ images using the Image Watch extension.
I requested support on this feature long time ago directly on the developercommunity it got a lot of upvotes but MSFT ...
Swill asked 18/9 at 7:12
2
I'm using ZeroMQ in Python and C++ in many configurations and I wonder which is the most elegant way to abort a recv() or poll() from another thread (e.g. in case of controlled program termination ...
6
I am looking to solve a recent problem of mine in a React Native TypeScript application, ran with Expo compiler.
Here is my full stack trace:
non-std C++ exception
ABI48_0_0RCTFatal
ABI48_0_0RCTCo...
Livestock asked 31/5, 2023 at 16:10
1
Solved
Consider the following simple code:
template<typename ...types>
class myclass
{
using payload_type = mylib::type_traits::type_or_tuple_t<types...>;
template<typename... T>
std...
4
c++17 provides if constexpr, in which:
the value of condition must be a contextually converted constant expression of type bool. If the value is true, then statement-false is discarded (if prese...
Cymbal asked 21/2, 2018 at 18:34
4
I am currently working on program with a lot of source files. Sometimes it is difficult to keep track of what libraries I have already #included. Theoretically, I could make a single header file ca...
3
Solved
When I try to export the following function as a dll:
extern "C" __declspec(dllexport) void some_func()
{
throw std::runtime_error("test throwing exception");
}
Visual C++ 2008 gives me the fol...
Hysterical asked 25/1, 2010 at 19:35
1
The following code compiles with g++ 14.2 and clang++ 18.1, but fails with MSVC 17.10.
class Base {
public:
using peak = Base;
Base() = default;
};
class Derived : public Base {
protected:
usin...
Outland asked 14/9 at 13:49
5
I was using UE5 with VSCode perfectly fine, and Intellisense and #include were both working fine. But when I made another C++ class in the editor, suddenly my Intellisense stopped working and I was...
Blancablanch asked 19/1, 2023 at 11:37
1
I know that, generally, we can forward-declare enums in C++11.
So, why does this:
enum kind_t { kind1, kind2 };
template <kind_t Kind> struct foo {};
template <> struct foo<kind1&g...
Dobbs asked 24/8, 2022 at 21:22
2
Solved
VS2019 latest c++ compiler.
Error is :"a coroutine's promise must declare either 'return_value' or 'return_void'"
Example pulled from David Mazièreshttps://www.scs.stanford.edu/~dm/blog/c...
Greenhead asked 28/4, 2021 at 18:59
1
I have installed gcc-10 compiler on my ubuntu 20.04. I needed to test the work of coroutine ts, so I found an example using coroutines and tried to compile it.
exemple:
#include <coroutine>
#...
Alkyd asked 27/11, 2020 at 15:45
4
Can somebody explain why everybody passes std::unique_ptr by value instead of by rvalue reference?
From what I've observed, this required an additional move constructor to be invoked.
Here's an exa...
Librarianship asked 19/4, 2022 at 20:17
7
I recently installed MinGW from MSYS2, and tested the program below:
#include<iostream>
using namespace std;
int main() {
cout << "Hello World";
return 0 ;
}
But I get a...
Projectionist asked 17/6, 2023 at 8:30
2
Please help me to understand how can I comment out a single line from a clang-tidy configuration file.
Bautista asked 4/3, 2021 at 9:13
2
Solved
I have the unfortunate task in 2024 of adding some code to a codebase that needs to be used in a C++03 setting - where unfortunately the original class myclass can't be changed.
I've gotten stuck o...
9
Solved
I'm using C and sometimes I have to handle paths like
C:\Whatever
C:\Whatever\
C:\Whatever\Somefile
Is there a way to check if a given path is a directory or a given path is a file?
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