How to use rvalue references? Summary of rvalue reference example usage

1. Lvalues ​​and rvalues: There is no standard definition of lvalues ​​and rvalues ​​in C++, but there is a widely recognized saying: those that can take addresses, have names, and are non-temporary are lvalues; those that cannot take addresses , without a name, temporary is an rvalue. It can be seen that immediate values, values ​​returned by functions, etc. are all rvalues; non-anonymous objects (including variables), references returned by functions, const objects, etc. are all lvalues. In essence As understood above, the creation and destruction are controlled by the compiler behind the scenes. The programmer can only ensure that the rvalues ​​(including immediate numbers) are valid in this line of code; and the ones created by the user, whose lifetime can be known through the scope rules, are lvalue (including references to local variables and const objects returned by functions), for example: int& foo(){int tmp; return tmp;} ​ int fooo(){int tmp; ret

1. A brief analysis of rvalue references, transfer semantics and perfect forwarding in C++11

#Introduction: Move semantics is an important concept for c++11, and I have always seemed to understand this concept. I recently looked through the information and felt suddenly enlightened, so by the way, I recorded rvalue references, transfer semantics and perfect forwarding in C++11 for your reference

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