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A Unbounded Sequence allows Out-of-Bounds access: it will achieve something like a Window Function. Most of the sequences do not meet this concept, but some special usecases do.
| ![[Important]](../../../../../../../doc/src/images/important.png) | Important | 
|---|---|
| User extending sequences should handle any parameters or be SFINAE-friendly. | 
Notation
sAn Fusion Sequence
SAn Fusion Sequence type
MAn MPL integral constant
NAn integral constant
KAn arbitrary key type
oAn arbitrary object
eA Sequence element
| Expression | Return type | Type Requirements | Runtime Complexity | 
|---|---|---|---|
| 
                     | Any type | Depends on its traversability | |
| 
                     | Any type | Depends on its traversability | |
| 
                     | Any type | Depends on its traversability | |
| 
                     | Any type | Depends on its traversability | |
| 
                     | Any type | 
                     | Depends on its traversability | 
| 
                     | Any type | 
                     | Depends on its traversability | 
| Expression | Compile Time Complexity | 
|---|---|
| 
                     | Depends on its traversability | 
| 
                     | Depends on its traversability | 
| 
                     | Depends on its traversability | 
| 
                     | Depends on its traversability | 
| 
                     | Depends on its traversability | 
| 
                     | Depends on its traversability |