I have a function of the form void foo(std::string str); I want to use it in two scenarios: send a copy of the original value to it: std::string myString = "any data that I want to keep in its ...

If we have an initialized std::vector std::vector<T> v = ...; then construct a span into that vector std::span<T> s = std::span<T>(v.begin(), 10); and then move the original vector ...

I played with a snippet of code below and had it compiled by GCC to compare std::move vs RVO( return value optimization ) #include <iostream> #include <chrono> #include <array> #...

I was reading up on rvalues and ran into something while trying a code snippet on compiler explorer. Here's a contrived example: class A { public: A&& func(A& rhs) { //...

I created a little parser and would like to make the looped part as fast as possible. Thus I would like to avoid copying using move semantics instead. But I can't understand how to combine move ...

#include <iostream> #include <vector> #include <utility> // simple user-defined class class MyClass { public: MyClass(int val) : value(val) {} private: int value; }; int ...

In the case of the example below Implicitly, the move constructor and move assignment operator are not created. I knew. So, are the copy constructor and copy assignment operator generated? Is the ...

I want to be able to initialize a class that holds a boost::container::flat_map<std::string, std::unique_ptr<AbstractBaseClass>> in the constructor. Example: class MapHolder { public: ...

I see this subject was discussed in StackOverflow, but I could not find the right answer. I've been using C++ for many years, and I am still in doubt about how to write a simple setter method for a ...

While working on my own array types, I encountered this issue, where one of my unit tests passes for Clang, but fails on MSVC with the following messages: error C7595: 'UnitTest': call to immediate ...

I'm trying to understand which is the most optimized way to pass arguments to functions. I got the answer for the book professional c++ but during some test I ran into a weird behavior. It's clear ...

This is a Josephus Permutation problem, it was solved by using std::move(), but now I have to switch to using std::move_iterator (by using std::make_move_iterator()) However, this doesn't compile: ...

I'm actually working to delete most of my copy constructor/assignation, and I faced an issue when comming to lambda use: ThreadPool: using Task = std::function<void()>; template<size_t S> ...

If I'm constructing a non-trivial container like a custom map for example, and want to share code between the emplace and insert functions, one approach would be to have the insert function simply ...

In the MSVC STL, the implementation of std::apply is as follows: template <class _Callable, _Tuple_like _Tuple, size_t... _Indices> constexpr decltype(auto) _Apply_impl(_Callable&& _Obj, ...