std::forward_list::before_begin, std::forward_list::cbefore_begin
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< cpp | container | forward list
| iterator before_begin(); |
(since C++11) | |
| const_iterator before_begin() const; |
(since C++11) | |
| const_iterator cbefore_begin() const; |
(since C++11) | |
Returns an iterator to the element before the first element of the container. This element acts as a placeholder, attempting to access it results in undefined behavior. The only usage cases are in functions insert_after(), emplace_after(), erase_after(), splice_after() and the increment operator: incrementing the before-begin iterator gives exactly the same iterator as obtained from begin()/cbegin().
Contents |
[edit] Parameters
(none)
[edit] Return value
iterator to the element before the first element
[edit] Exceptions
1-3)[edit] Complexity
Constant
[edit] See also
| returns an iterator to the beginning (public member function) | |
| returns an iterator to the end (public member function) | |
