Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
| Front Page / Sequences / Concepts / Bidirectional Sequence |
A Bidirectional Sequence is a Forward Sequence whose iterators model Bidirectional Iterator.
In addition to the requirements defined in Forward Sequence, for any Bidirectional Sequence s the following must be met:
| Expression | Type | Complexity |
|---|---|---|
| begin<s>::type | Bidirectional Iterator | Amortized constant time |
| end<s>::type | Bidirectional Iterator | Amortized constant time |
| back<s>::type | Any type | Amortized constant time |
The semantics of an expression are defined only where they differ from, or are not defined in Forward Sequence.
| Expression | Semantics |
|---|---|
| back<s>::type | The last element in the sequence; see back. |