[flat.set.cons.alloc]

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template<class Alloc>
  constexpr flat_set(const container_type& cont, const Alloc& a);
template<class Alloc>
  constexpr flat_set(const container_type& cont, const key_compare& comp, const Alloc& a);

Effects: Equivalent to flat_set(cont) and flat_set(cont, comp), respectively, except that c is constructed with uses-allocator construction ([allocator.uses.construction]).

Complexity: Same as flat_set(cont) and flat_set(cont, comp), respectively.

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template<class Alloc>
  constexpr flat_set(sorted_unique_t, const container_type& cont, const Alloc& a);
template<class Alloc>
  constexpr flat_set(sorted_unique_t, const container_type& cont,
                     const key_compare& comp, const Alloc& a);

Effects: Equivalent to flat_set(sorted_unique, cont) and flat_set(sorted_unique, cont,
comp), respectively, except that c is constructed with uses-allocator construction ([allocator.uses.construction]).

Complexity: Linear.

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template<class Alloc>
  constexpr explicit flat_set(const Alloc& a);
template<class Alloc>
  constexpr flat_set(const key_compare& comp, const Alloc& a);
template<class Alloc>
  constexpr flat_set(const flat_set&, const Alloc& a);
template<class Alloc>
  constexpr flat_set(flat_set&&, const Alloc& a);
template<class InputIterator, class Alloc>
  constexpr flat_set(InputIterator first, InputIterator last, const Alloc& a);
template<class InputIterator, class Alloc>
  constexpr flat_set(InputIterator first, InputIterator last, const key_compare& comp,
                     const Alloc& a);
template<class InputIterator, class Alloc>
  constexpr flat_set(sorted_unique_t, InputIterator first, InputIterator last, const Alloc& a);
template<class InputIterator, class Alloc>
  constexpr flat_set(sorted_unique_t, InputIterator first, InputIterator last,
                     const key_compare& comp, const Alloc& a);
template<container-compatible-range<value_type> R, class Alloc>
  constexpr flat_set(from_range_t, R&& rg, const Alloc& a);
template<container-compatible-range<value_type> R, class Alloc>
  constexpr flat_set(from_range_t, R&& rg, const key_compare& comp, const Alloc& a);
template<class Alloc>
  constexpr flat_set(initializer_list<value_type> il, const Alloc& a);
template<class Alloc>
  constexpr flat_set(initializer_list<value_type> il, const key_compare& comp, const Alloc& a);
template<class Alloc>
  constexpr flat_set(sorted_unique_t, initializer_list<value_type> il, const Alloc& a);
template<class Alloc>
  constexpr flat_set(sorted_unique_t, initializer_list<value_type> il,
                     const key_compare& comp, const Alloc& a);

Effects: Equivalent to the corresponding non-allocator constructors except that c is constructed with uses-allocator construction ([allocator.uses.construction]).