📅 最后修改于: 2020-12-15 04:38:17 🧑 作者: Mango
它是一个类似指针的对象，可以使用++进行递增，使用*取消引用，然后使用！=与另一个迭代器进行比较。
| category | properties | valid expressions | |||
|---|---|---|---|---|---|
| all categories |
copy-constructible, copy-assignable and destructible |
b = a; |
|||
| It can be incremented |
a++ |
||||
| Random Access | Bidirectional | Forward | Input | It supports equality/inequality comparisons |
a != b |
| It can be dereferenced as an rvalue |
*a a->m |
||||
| Output |
It can be dereferenced as an lvalue (only for mutable iterator types) |
*a = t *a++ = t |
|||
| default-constructible |
X a; X() |
||||
| Multi-pass: neither dereferencing nor incrementing affects dereferenceability | { b = a; *a++; *b; } |
||||
| It can be decremented |
--a a– *a– |
||||
| It supports arithmetic operators + and - |
a + n n + a a – n a – b |
||||
| It supports inequality comparisons ( <, >, <= and >=) between iterators |
a < b a > b a <= b a >= b |
||||
| It supports compound assignment operations += and -= |
a += n a -= n |
||||
| It supports offset dereference operator ([]) | a[n] | ||||
| Sr.No. | Functions & Description |
|---|---|
| 1 | advance
It advances the iterator it by n element positions. |
| 2 | distance
It returns distance between iterators. |
| 3 | begin
It is used to begin an iterator. |
| 4 | end
It is used to end an iterator. |
| 5 | prev
It is used to get iterator to previous element. |
| 6 | next
It is used to get iterator to next element. |
| Sr.No. | Iterator generators & Description |
|---|---|
| 1 | back_inserter
It constructs back insert iterator. |
| 2 | inserter
It constructs insert iterator |
| 3 | make_move_iterator
It construct move iterators. |
| Sr.No. | Classes & Description |
|---|---|
| 1 | iterator
It iterators base class. |
| 2 | iterator_traits
It is an iterator traits. |
| Sr.No. | Predefined iterators & Description |
|---|---|
| 1 | reverse_iterator
It is a reverse iterator. |
| 2 | move_iterator
It is a move iterator. |
| 3 | back_insert_iterator
It is a back insert iterator. |
| 4 | front_insert_iterator
It is a front insert iterator. |
| 5 | insert_iterator
It is used to insert an iterator. |
| 6 | istream_iterator
It is an input stream iterator. |
| 7 | ostream_iterator
It is an output stream iterator. |
| 8 | istreambuf_iterator
It is an input stream buffer iterator. |
| 7 | ostreambuf_iterator
It is an output stream buffer iterator. |
| Sr.No. | Category tags & Description |
|---|---|
| 1 | input_iterator_tag
Input iterator category. |
| 2 | output_iterator_tag
output iterator category. |
| 3 | forward_iterator_tag
Forward iterator category. |
| 4 | bidirectional_iterator_tag
Bidirectional iterator category. |
| 5 | random_access_iterator_tag
Random-access iterator category. |