31,808 questions
0
votes
1
answer
34
views
Getting clangd to work when compiling with MSVC
I'm using Windows 11, CMake, VSCodium, clangd 21.1.0 and Visual Studio 2022 Community. I can compile my project just fine but I don't know how to get clangd set up and working, I know that it's ...
- 1,710
3
votes
1
answer
142
views
Conditional operator with a throwing branch in Visual C++ 2026
My program changed its behavior after updating Visual Studio to the latest version (2026).
Simplifying it, I got the following minimal example, which contains a ternary operator with a throw in ...
- 24.7k
4
votes
1
answer
175
views
MSVC 14.38.33130: Does std::atomic_ref::is_lock_free have a bug? It returns true for a 1024-byte struct
I am encountering suspicious behavior with std::atomic_ref::is_lock_free() in Microsoft Visual Studio's C++ compiler (MSVC version 14.38.33130). The method returns true for a very large structure (...
- 228
0
votes
0
answers
134
views
C++ Unicode Problems/Questions
I wrote two versions of a little program in C++ with MSVC on Windows 11:
First one:
#include <iostream>
#include <Windows.h>
int main()
{
SetConsoleOutputCP(CP_UTF8);
std::cout &...
- 325
0
votes
1
answer
179
views
Is it valid to explicitly call a constructor, like S::S{}?
Here's the code:
struct S{};
int main()
{
S::S{};
return 0;
}
When using GCC and Clang, it will fail with a clear error output:
qualified reference to 'S' is a constructor name rather than a ...
- 137
Advice
1
vote
7
replies
179
views
How does Microsofts std::lib implementation perform debug iterator checks?
In the question Why does Microsoft's implementation of std::string require 40 bytes on the stack? the observation is made, that a std::string requires 8 additional bytes in Debug mode.
After ...
- 3,242
0
votes
1
answer
60
views
Using a derived edit box control to process keystrokes ahead of CEdit control in MFC
In a modeless dialog box in MFC, I want to create an edit box control, derived from CEdit, that will allow me to intercept keystrokes (in particular the CR) and process it differently from the default ...
- 21
0
votes
1
answer
60
views
In subclassing an edit box using SetWindowLongPtrA() to pass a function address, I get an "incompatable type" error
I'm trying to subclass an edit box in a dialog in VS C++ 2022. I want to intercept any key presses in a particular edit box to do further processing.
Here's my code. The 4th line confuses me because I ...
- 21
14
votes
1
answer
373
views
Are pointers to pure virtual member functions of local classes allowed?
Consider the following snippet:
int main() {
struct Local {
virtual void foo() = 0;
};
void (Local::* ptr)() = &Local::foo;
}
When compiling with C++20, GCC 13.3.0 and Clang 18.1.3 ...
- 728
0
votes
1
answer
115
views
Does integer zero division always raise exception on 64-bit Arm on Windows?
When I perform integer division by zero on Windows 11 on Arm64, it raises a SEH exception.
That is rather surprising, considering Arm by default does not trap zero division.
My question is: does the ...
- 14.3k
12
votes
1
answer
736
views
How can I set up Thread-Local Storage (TLS) callbacks on Windows without CRT?
I'm trying to register a Thread-Local Storage (TLS) callback in a Windows application without using the C runtime (CRT).
Compiler: MSVC 14.44.35207 (Visual Studio 2022)
Target: x64
OS: Windows 11
I ...
- 131
2
votes
1
answer
184
views
Is it possible to call x86 `idiv r/m8` from MSVC2022 using C++ directly?
I am trying to call idiv r/m8 using MSVC2022's current Microsoft Visual C++ Compiler 17.4.33403.182 and C++.
Using the most straightforward approach:
struct cdiv_t
{
// char
std::int8_t quot;
...
- 332
2
votes
2
answers
148
views
Why would MSVC 2022 create two idiv calls for one std::div without any optimizations?
Using CMAKE_BUILD_TYPE="Debug" my MSVC 2022 [17.4.33403.182] produced one idiv call for the quotient and an identical idiv call for the remainder. The code was simply [see here for the ...
- 332
0
votes
0
answers
88
views
Loading a resource DLL build for a different architecture to only assess resources
I'm programming a MFC application that should be internationalized. Currently I'm providing separate language DLLs per architecture (ARM64, x86, x64), but I'm unsure whether this is really necessary. ...
- 34.4k
0
votes
0
answers
91
views
Use resource DLL loaded using LoadLibraryEx(..., LOAD_LIBRARY_AS_DATAFILE | LOAD_LIBRARY_AS_IMAGE_RESOURCE) with AfxSetResourceHandle
I'm programming a MFC application that should be internationalized. Currently I'm providing separate language DLLs per architecture (ARM64, x86, x64), but recently I came accross ::LoadLibraryEx(...
- 34.4k