| CGAL 5.1 - STL Extensions for CGAL
    | 
#include <Concepts/Index.h>
The concept Index is a refinement of Descriptor which must be convertible from and to std::size_t, and must be incrementable and decrementable. 
int
size_t
Notation
I n std::size_t. Valid Expressions
| Expression | Returns | Description | 
|---|---|---|
| Index I(n) | - | Creates an index Ifrom astd::size_t. | 
| (std::size_t)I | std::size_t | Converts Iinto astd::size_t. | 
| ++I | Index& | Pre-increments I. | 
| I++ | Index | Post-increments I. | 
| --I | Index& | Pre-decrements I. | 
| I-- | Index | Post-decrements I. |