J.S. Cruz

C++ Value Categories Reference

06 May 2023

Cppreference. Standard-d20 (§7.2.1).

Graph with Is-A relationships between the C++ value categories. — Arrows denote "Is-A" relationships.

Primary value categories:

prvalue
```
1; true; int f(), f(); ++x; &x;
```
xvalue
```
T{}; std::move(a); T().m;
```
lvalue:
```
x; a[3]; "hi";
```

Secondary value categories:

glvalue:

Any expression which can have a dynamic type.

rvalue
```
1; std::move(x);
```

Reference binding:

lvalue references bind to lvalues.
const lvalue references bind to lvalues and rvalues.
rvalue references bind to rvalues.

Tags: #programming #C++ #reference