constexpr stacktrace_entry() noexcept;
constexpr native_handle_type native_handle() const noexcept;
constexpr explicit operator bool() const noexcept;
string description() const;
string source_file() const;
uint_least32_t source_line() const;
static basic_stacktrace current(const allocator_type& alloc = allocator_type()) noexcept;
static basic_stacktrace current(size_type skip,
const allocator_type& alloc = allocator_type()) noexcept;
static basic_stacktrace current(size_type skip, size_type max_depth,
const allocator_type& alloc = allocator_type()) noexcept;
basic_stacktrace() noexcept(is_nothrow_default_constructible_v<allocator_type>);
explicit basic_stacktrace(const allocator_type& alloc) noexcept;
basic_stacktrace(const basic_stacktrace& other);
basic_stacktrace(const basic_stacktrace& other, const allocator_type& alloc);
basic_stacktrace(basic_stacktrace&& other, const allocator_type& alloc);
basic_stacktrace& operator=(const basic_stacktrace& other);
basic_stacktrace& operator=(basic_stacktrace&& other)
noexcept(allocator_traits<Allocator>::propagate_on_container_move_assignment::value ||
allocator_traits<Allocator>::is_always_equal::value);
using const_iterator = implementation-defined;
allocator_type get_allocator() const noexcept;
const_iterator begin() const noexcept;
const_iterator cbegin() const noexcept;
const_iterator end() const noexcept;
const_iterator cend() const noexcept;
const_reverse_iterator rbegin() const noexcept;
const_reverse_iterator crbegin() const noexcept;
const_reverse_iterator rend() const noexcept;
const_reverse_iterator crend() const noexcept;
[[nodiscard]] bool empty() const noexcept;
size_type size() const noexcept;
size_type max_size() const noexcept;
const_reference operator[](size_type frame_no) const;
const_reference at(size_type frame_no) const;
template<class Allocator2>
friend bool operator==(const basic_stacktrace& x, const basic_stacktrace<Allocator2>& y) noexcept;
template<class Allocator2>
friend strong_ordering
operator<=>(const basic_stacktrace& x, const basic_stacktrace<Allocator2>& y) noexcept;
void swap(basic_stacktrace& other)
noexcept(allocator_traits<Allocator>::propagate_on_container_swap::value ||
allocator_traits<Allocator>::is_always_equal::value);
template<class Allocator>
void swap(basic_stacktrace<Allocator>& a, basic_stacktrace<Allocator>& b)
noexcept(noexcept(a.swap(b)));
string to_string(const stacktrace_entry& f);
template<class Allocator>
string to_string(const basic_stacktrace<Allocator>& st);
ostream& operator<<(ostream& os, const stacktrace_entry& f);
template<class Allocator>
ostream& operator<<(ostream& os, const basic_stacktrace<Allocator>& st);
template<> struct formatter<stacktrace_entry>;
template<class Allocator> struct formatter<basic_stacktrace<Allocator>>;
template<> struct hash<stacktrace_entry>;
template<class Allocator> struct hash<basic_stacktrace<Allocator>>;