In [conv.lval] p3.4, the result of lvalue-to-rvalue conversion is described as follows: Otherwise, the object indicated by the glvalue is read ([defns.access]), and the value contained in the obje...

Consider this code (godbolt): #include <iostream> template<typename F> void call_by_val(F funct) { std::cout << "call_by_val(): "; funct(); } template<typename ...

I'm trying to learn C++ ranges. As far as I can see, the simplest (and the only, short of implementing a custom range view class) way to create a range view object that generates a custom sequence ...

The implementation of these methods seems straightforward to me and they would make usage of std::string and std::string_view more interchangeable. After all, std::string_view has constructors whic...

I have a source file with a large byte array representing an image. Below an example (in reality it can be any random data): const uint8_t image_test_image[] ={ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05,...

Consider the toy example code below. It has a too-large-to-copy data structure MyDataStructure and a little iterator class MyDataIterator that the caller can instantiate to iterate over the data in...

I downloaded Visual Studio 2017 and pulled my solution repo. However, I'm having some issues because it appears that a lot of the files I had on my previous computer were not downloaded in the inst...

I have a hierarchy of polymorphic classes. At some level in the hierarchy, I want to make the implementation of a virtual method final. Additionally, I just want to use the base class implementatio...

GCC G++ 9 This code: class foo { int bar[] = {111, 123}; }; produces an error about initializer for flexible array. But this one: class foo { int bar[2] = {111, 123}; }; compiles as n...

I'm new to the "hidden/dark places" of C++ and I was wondering how to load a .dll file from a different directory or a sub-directory inside the one where my current executable is running Ex: ./My...

It's very natural to want to compare std::array's at compile time; and its operator==() is obviously constexpr'able. Yet - it isn't marked constexpr. Is this intentional or an oversight? And - what...

I am working to implement a code which was written in MATLAB into C++. In MATLAB you can slice an Array with another array, like A(B), which results in a new array of the elements of A at the index...

A requires-expression similarly to a function can introduce local parameters using a parameter list. And lambda expressions defined at block scope may have captures without initializers. Is it allo...

I'm trying to use opencv native library in an android studio project. I get an error for undefined reference for the function knnMatch. I have added openCVLibrary to my project and had success to ...

GCC accepts this code, Clang and MSVC reject it due to failed static assertion in assert. What does the standard say? https://godbolt.org/z/PKMKzYGsc template<typename T> constexpr int assert...

I need to reduce the memory used by my native Windows C++ application, without compromising its performances. My main data structure is composed by several thousands of instances, dynamically allo...

I have updated XCode(v. 16.0) and made sure the xcode command line tools (xcode-select version 2409) are updated. I have installed the C/C++ VS Code extension v.1.21.6 My compiler path is set to /u...

I've got an algorithm I've used for years to emulate a real-time clock in a non-real-time environment. It's always worked exceptionally well until used on Ubuntu 24.04 in WSL2 in Windows 11. The lo...

This code compiles on gcc and msvc but not with clang from C++20 on: #include <type_traits> class IBase { protected: IBase() noexcept = default; public: virtual ~IBase() noexcept = defa...

In GDB, I can do the following and get address of a string literal: (gdb) p &"aaa" $3 = (char (*)[4]) 0x614c20 As I understand, a string literal is a rvalue with no symbol to which i...

I would like to convert wstring to wchar_t*. I have tried everything what i know, please help. I would like to convert wstring to wchar_t*.

I would like to add some type of validation to my QInputDialog. I use the input of the dialog to create a file system path. So I would like to exclude characters such as @$#%^&*() but keep - an...

This code is an attempt to reinterpret memory contents as a different type without violating strict aliasing rules. It was suggested as an answer to "Using std::memmove to work around strict a...

I have a simple project where the file structure looks like this: - CMakeLists.txt - main.cpp The CMakeLists.txtlooks like this: # Project initialization cmake_minimum_required (VERSION 2.6) pr...

I'm reading the documentation on std::expected::operator==, and apparently it's not SFINAE-friendly. Instead of "doesn't participate in overload resolution if [types are not eq-comparable]&quo...