Lvalue reference and lvalue reference

What is quotation

Reference is to get an alias for an existing variable , Instead of defining a new variable . The compiler does not open up new memory space for reference variables , The referenced variable and the referenced variable share the same memory space .

The rules quoted

• Reference must be initialized at definition time

• A variable can have multiple references

• Reference once an entity is referenced , No more references to other entities

What is left value , Right value

The right quotation is C++ 11 New features , Lvalue reference from C++ 98 There's been .

At present, we focus on C++ programing language .

The left value （left-values）, abbreviation ：lvalues

Right value （right-values）, abbreviation ：rvalues

You can easily understand lvalues An object that exists outside a single expression . You can think of an lvalue as an object with a name .

rvalues Is an object whose value exists temporarily within a single expression . Simply speaking , The right value is the value at the end of a life cycle . It's also called dying value .

The following is the principle written on the official website