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C++ Iterator Library - forward_iterator_tag
Description
It is an iterators that can be used to access the sequence of elements in a range in the direction that goes from its beginning towards its end.
C++98
property | valid expressions |
---|---|
It is a default-constructible, copy-constructible,copy-assignable and destructible |
X b(a); b = a; |
It can be compared for equivalence using the equality/inequality operators (meaningful when both iterator values iterate over the same underlying sequence). |
a != b |
It can be dereferenced as an rvalue (if in a dereferenceable state). |
a->m |
For mutable iterators (non-constant iterators): Can be dereferenced as an lvalue (if in a dereferenceable state). |
*a = t |
It can be incremented (if in a dereferenceable state). The result is either also dereferenceable or a past-the-end iterator. Two iterators that compare equal, keep comparing equal when both are increased. |
a++ *a++ |
C++11
property | valid expressions |
---|---|
It is a default-constructible, copy-constructible copy-assignable and destructible |
X b(a); b = a; |
It can be compared for equivalence using the equality/inequality operators (meaningful when both iterator values iterate over the same underlying sequence). |
a != b |
It can be dereferenced as an rvalue (if in a dereferenceable state). |
a->m |
For mutable iterators (non-constant iterators): Can be dereferenced as an lvalue (if in a dereferenceable state). |
*a = t |
It can be incremented (if in a dereferenceable state). The result is either also dereferenceable or a past-the-end iterator. Two iterators that compare equal, keep comparing equal when both are increased. |
a++ *a++ |
Lvalues are swappable. | swap(a,b) |
Declaration
Following is the declaration for std::forward_iterator_tag.
C++11
struct forward_iterator_tag {};