One of the corners of C++20 concepts is that there are certain situations in which you have to write requires requires. For instance, this example from [expr.prim.req]/3: A requires-expression can also be used in a requires-clause ([temp]) as a way of writing ad hoc constraints on template arguments such as the one below: template<typename T> … Read more
While I was trying to learn about C++ operators, I stumbled upon a strange comparison operator on cppreference.com,* in a table that looked like this: “Well, if these are common operators in C++, I better learn them”, I thought. But all my attempts to elucidate this mystery were unsuccessful. Even here, on Stack Overflow I … Read more
Recently I’ve gotten suggestions to use span<T>‘s in my code, or have seen some answers here on the site which use span‘s – supposedly some kind of container. But – I can’t find anything like that in the C++17 standard library. So what is this mysterious span<T>, and why (or when) is it a good … Read more
Contrary to all other similar questions, this question is about using the new C++ features. 2008 c Is there a simple way to convert C++ enum to string? 2008 c Easy way to use variables of enum types as string in C? 2008 c++ How to easily map c++ enums to strings 2008 c++ Making … Read more
