c++ - C++11 rvalue reference questions -

c++ - C++11 rvalue reference questions -

i trying understand new features of c++11, , have 2 questions regarding rvalue references.

i have not seen examples when functions homecoming rvalue references (except std::move). there cases when makes sense so? e. g., int&& foo(...).

are there cases when makes sense have rvalue references const, either when declaring local variables or function arguments? e. g., foo(int const&& i).

1) have not seen examples when functions homecoming rvalue references (except std::move). there cases when makes sense so?

apart library functions not doing much more casting argument rvalue reference (such std::move and, when appropriate, std::forward) , returning argument, don't believe meet often.

2) there cases when makes sense have rvalue references const?

not many. none, actually. rvalue references used when want bind object want move from, , since cannot move const object (because moving alters state of object move from, , const promises opposite), makes little sense have rvalue reference const. notice, lvalue references const can bind rvalues well. there a few utilize cases that though.

c++ c++11 reference rvalue-reference