std::forward_list<T,Allocator>::before_begin, cbefore_begin
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< cpp | container | forward list
iterator before_begin() noexcept; |
(1) | (since C++11) (constexpr since C++26) |
const_iterator before_begin() const noexcept; |
(2) | (since C++11) (constexpr since C++26) |
const_iterator cbefore_begin() const noexcept; |
(3) | (since C++11) (constexpr since C++26) |
Returns a non-dereferenceable iterator, incrementing the before-begin iterator gives exactly the same iterator as obtained from begin()/cbegin().
The only usage cases are in functions insert_after(), emplace_after(), erase_after(), splice_after() and the increment operator.
Contents |
[edit] Return value
An iterator representing the position right before the begin iterator.
[edit] Complexity
Constant.
[edit] Example
| This section is incomplete Reason: no example |
[edit] See also
| returns an iterator to the beginning (public member function) | |
| returns an iterator to the end (public member function) |
