Ref-qualifiers – introduced in C++11 Ref-qualifiers is not C++17 feature (looking at the tag of the question), but was a feature introduced in C++11. struct Foo { void bar() const & { std::cout << “const lvalue Foo\n”; } void bar() & { std::cout << “lvalue Foo\n”; } void bar() const && { std::cout << “const … Read more
Just read down below: During overload resolution, non-static cv-qualified member function of class X is treated as a function that takes an implicit parameter of type lvalue reference to cv-qualified X if it has no ref-qualifiers or if it has the lvalue ref-qualifier. Otherwise (if it has rvalue ref-qualifier), it is treated as a function … Read more
First, “ref-qualifiers for *this” is a just a “marketing statement”. The type of *this never changes, see the bottom of this post. It’s way easier to understand it with this wording though. Next, the following code chooses the function to be called based on the ref-qualifier of the “implicit object parameter” of the function†: // … Read more