[stacktrace.basic.obs]

using const_iterator = implementation-defined;

allocator_type get_allocator() const noexcept;

Returns: frames_.get_allocator().

const_iterator begin() const noexcept;
const_iterator cbegin() const noexcept;

Returns: An iterator referring to the first element in frames_.

If empty() is true, then it returns the same value as end().

const_iterator end() const noexcept;
const_iterator cend() const noexcept;

Returns: The end iterator.

const_reverse_iterator rbegin() const noexcept;
const_reverse_iterator crbegin() const noexcept;

Returns: reverse_iterator(cend().

const_reverse_iterator rend() const noexcept;
const_reverse_iterator crend() const noexcept;

Returns: reverse_iterator(cbegin().

bool empty() const noexcept;

Returns: frames_.empty().

size_type size() const noexcept;

Returns: frames_.size().

size_type max_size() const noexcept;

Returns: frames_.max_size().

const_reference operator[](size_type frame_no) const;

Throws: Nothing.

const_reference at(size_type frame_no) const;

Throws: out_of_range if frame_no >= size().

19 Diagnostics library [diagnostics]