const& , & and && specifiers for member functions in C++

by

const& means, that this overload will be used only for const, non-const and lvalue object.

const A a = A();
*a;

& means, that this overload will be used only for non-const object.

A a;
*a;

&& means, that this overload will be used only for rvalue object.

*A();

for more information about this feature of C++11 standard you can read this post What is “rvalue reference for *this”?

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