[stack.cons.alloc]

template<class Alloc> constexpr explicit stack(const Alloc& a);

Effects: Initializes c with a.

template<class Alloc> constexpr stack(const container_type& cont, const Alloc& a);

Effects: Initializes c with cont as the first argument and a as the second argument.

template<class Alloc> constexpr stack(container_type&& cont, const Alloc& a);

Effects: Initializes c with std::move(cont) as the first argument and a as the second argument.

template<class Alloc> constexpr stack(const stack& s, const Alloc& a);

Effects: Initializes c with s.c as the first argument and a as the second argument.

template<class Alloc> constexpr stack(stack&& s, const Alloc& a);

Effects: Initializes c with std::move(s.c) as the first argument and a as the second argument.

template<class InputIterator, class Alloc>
  constexpr stack(InputIterator first, InputIterator last, const Alloc& alloc);

Effects: Initializes c with first as the first argument, last as the second argument, and alloc as the third argument.

template<container-compatible-range<T> R, class Alloc>
  constexpr stack(from_range_t, R&& rg, const Alloc& a);

Effects: Initializes c with ranges::to<Container>(std::forward<R>(rg), a).