because I’m going to explain how rvalue references work in great detail. They’re initially very confusing because they distinguish lvalues from rvalues, which very few C++98/03 programmers are extensively familiar with.
because I'm going to explain how rvalue references work in great detail. They're initially very confusing because they distinguish lvalues from rvalues, which very few C++98/03 programmers are extensively familiar with.
The temporary objects constructed at parameter evaluation are destroyed as soon as the function are called for the reasons exposed above and the parameters are dangling references. Referencing them inside the functions will result in UB. Thecorrectway is to return by value: classAvenger{public: Aven...
i.e. an rvalue) intostd::string&& s_rref. Nows_rrefis a reference to a temporary object, or an rvalue reference. There are noconstaround it, so I'm free to modify the temporary string to my needs. This wouldn't be possible without rvalue references and its double ampersand...
Why rvalue reference as return type can't be initialization, Non-const references cannot bind to rvalues, it's as simple as that. int & a=fun(); does not work because a is a non-const reference and fun() is an rvalue expression. In the second case, fun() returns a non-const...
which enable two different things:move semanticsandperfect forwarding. This post will be long, because I’m going to explain how rvalue references work in great detail. They’re initially very confusing because they distinguish lvalues from rvalues, which very few C++98/03 programmers are extensiv...