标准库头文件 <flat_set> (C++23)

 

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语言支持
<cstddef> <cstdlib> <version> (C++20) <limits> <climits>	<cfloat> <cstdint> (C++11) <stdfloat> (C++23) <new> <typeinfo>	<source_location> (C++20) <exception> <initializer_list> (C++11) <compare> (C++20)	<coroutine> (C++20) <csignal> <csetjmp> <cstdarg>
概念
<concepts> (C++20)
诊断
<stdexcept> <stacktrace> (C++23)	<cassert>	<cerrno>	<system_error> (C++11)
内存管理
<memory>	<memory_resource> (C++17)	<scoped_allocator> (C++11)
元编程
<type_traits> (C++11)	<ratio> (C++11)
通用实用程序
<utility> <tuple> (C++11) <optional> (C++17) <variant> (C++17)	<any> (C++17) <debugging> (C++26) <expected> (C++23) <bitset>	<functional> <typeindex> (C++11) <execution> (C++17)	<charconv> (C++17) <format> (C++20) <bit> (C++20)
字符串
<string_view> (C++17) <string>	<cctype> <cwctype>	<cstring> <cwchar>	<cuchar> (C++11)
容器
<array> (C++11) <deque> <forward_list> (C++11) <list>	<vector> <map> <set> <unordered_map> (C++11)	<unordered_set> (C++11) <queue> <stack> <flat_map> (C++23)	<flat_set> (C++23) <span> (C++20) <mdspan> (C++23) <inplace_vector> (C++26)
迭代器
<iterator>
范围
<ranges> (C++20)	<generator> (C++23)
算法
<algorithm>	<numeric>
数值
<cfenv> (C++11) <complex>	<random> (C++11) <valarray>	<cmath> <linalg> (C++26)	<numbers> (C++20)
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<chrono> (C++11)	<ctime>
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<locale>	<clocale>	<codecvt> (C++11/17/26*)	<text_encoding> (C++26)
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<iosfwd> <iostream> <ios> <streambuf>	<istream> <ostream> <iomanip> <print> (C++23)	<sstream> <spanstream> (C++23) <fstream> <syncstream> (C++20)	<filesystem> (C++17) <cstdio> <cinttypes> (C++11) <strstream> (C++98/26*)
正则表达式
<regex> (C++11)
并发支持
<stop_token> (C++20) <thread> (C++11) <atomic> (C++11) <rcu> (C++26)	<stdatomic.h> (C++23) <mutex> (C++11) <shared_mutex> (C++14)	<condition_variable> (C++11)   <semaphore> (C++20) <latch> (C++20)	<barrier> (C++20) <future> (C++11) <hazard_pointer> (C++26)
C 兼容性
<cstdbool> (C++11/17/20*)   <ccomplex> (C++11/17/20*)	<ctgmath> (C++11/17/20*)	<cstdalign> (C++11/17/20*)	<ciso646> (直至 C++20)

 

此头文件是 容器 库的一部分。

包含
<compare> (C++20)	三路比较运算符 支持
<initializer_list> (C++11)	std::initializer_list 类模板
类
flat_set (C++23)	将容器改编为提供按键排序的唯一键集合 (类模板)
flat_multiset (C++23)	将容器改编为提供按键排序的键集合 (类模板)
std::uses_allocator<std::flat_set> (C++23)	专门化 std::uses_allocator 类型特征 (类模板专门化)
std::uses_allocator<std::flat_multiset> (C++23)	专门化 std::uses_allocator 类型特征 (类模板专门化)
函数
erase_if(std::flat_set) (C++23)	擦除所有满足特定条件的元素 (函数模板)
erase_if(std::flat_multiset) (C++23)	擦除所有满足特定条件的元素 (函数模板)
标签
sorted_uniquesorted_unique_t (C++23)	指示范围的元素已排序且唯一 (标签)
sorted_equivalentsorted_equivalent_t (C++23)	指示范围的元素已排序（不需要唯一性） (标签)

提要

#include <compare>
#include <initializer_list>
 
namespace std {
  // class template flat_set
  template<class Key, class Compare = less<Key>, class KeyContainer = vector<Key>>
  class flat_set;
 
  struct sorted_unique_t
  {
    explicit sorted_unique_t() = default;
  };
  inline constexpr sorted_unique_t sorted_unique{};
 
  template<class Key, class Compare, class KeyContainer, class Allocator>
  struct uses_allocator<flat_set<Key, Compare, KeyContainer>, Allocator>;
 
  // erasure for flat_set
  template<class Key, class Compare, class KeyContainer, class Predicate>
  typename flat_set<Key, Compare, KeyContainer>::size_type erase_if(
    flat_set<Key, Compare, KeyContainer>& c,
    Predicate pred);
 
  // class template flat_multiset
  template<class Key, class Compare = less<Key>, class KeyContainer = vector<Key>>
  class flat_multiset;
 
  struct sorted_equivalent_t
  {
    explicit sorted_equivalent_t() = default;
  };
  inline constexpr sorted_equivalent_t sorted_equivalent{};
 
  template<class Key, class Compare, class KeyContainer, class Allocator>
  struct uses_allocator<flat_multiset<Key, Compare, KeyContainer>, Allocator>;
 
  // erasure for flat_multiset
  template<class Key, class Compare, class KeyContainer, class Predicate>
  typename flat_multiset<Key, Compare, KeyContainer>::size_type erase_if(
    flat_multiset<Key, Compare, KeyContainer>& c,
    Predicate pred);
}

类模板 std::flat_set

namespace std {
  template<class Key, class Compare = less<Key>, class KeyContainer = vector<Key>>
  class flat_set
  {
  public:
    // types
    using key_type               = Key;
    using value_type             = Key;
    using key_compare            = Compare;
    using value_compare          = Compare;
    using reference              = value_type&;
    using const_reference        = const value_type&;
    using size_type              = typename KeyContainer::size_type;
    using difference_type        = typename KeyContainer::difference_type;
    using iterator               = /* implementation-defined */;
    using const_iterator         = /* implementation-defined */;
    using reverse_iterator       = std::reverse_iterator<iterator>;
    using const_reverse_iterator = std::reverse_iterator<const_iterator>;
    using container_type         = KeyContainer;
 
    // constructors
    flat_set()
      : flat_set(key_compare())
    {
    }
 
    explicit flat_set(const key_compare& comp)
      : /*c*/()
      , /*compare*/(comp)
    {
    }
 
    explicit flat_set(container_type cont, const key_compare& comp = key_compare());
 
    flat_set(sorted_unique_t,
             container_type cont,
             const key_compare& comp = key_compare())
      : /*c*/(std::move(cont))
      , /*compare*/(comp)
    {
    }
 
    template<class InputIter>
    flat_set(InputIter first, InputIter last, const key_compare& comp = key_compare())
      : /*c*/()
      , /*compare*/(comp)
    {
      insert(first, last);
    }
 
    template<class InputIter>
    flat_set(sorted_unique_t,
             InputIter first,
             InputIter last,
             const key_compare& comp = key_compare())
      : /*c*/(first, last)
      , /*compare*/(comp)
    {
    }
 
    template<container-compatible-range<value_type> R>
    flat_set(from_range_t fr, R&& rg)
      : flat_set(fr, std::forward<R>(rg), key_compare())
    {
    }
    template<container-compatible-range<value_type> R>
    flat_set(from_range_t, R&& rg, const key_compare& comp)
      : flat_set(comp)
    {
      insert_range(std::forward<R>(rg));
    }
 
    flat_set(initializer_list<value_type> il, const key_compare& comp = key_compare())
      : flat_set(il.begin(), il.end(), comp)
    {
    }
 
    flat_set(sorted_unique_t s,
             initializer_list<value_type> il,
             const key_compare& comp = key_compare())
      : flat_set(s, il.begin(), il.end(), comp)
    {
    }
 
    // constructors with allocators
 
    template<class Alloc>
    explicit flat_set(const Alloc& a);
    template<class Alloc>
    flat_set(const key_compare& comp, const Alloc& a);
    template<class Alloc>
    flat_set(const container_type& cont, const Alloc& a);
    template<class Alloc>
    flat_set(const container_type& cont, const key_compare& comp, const Alloc& a);
    template<class Alloc>
    flat_set(sorted_unique_t, const container_type& cont, const Alloc& a);
    template<class Alloc>
    flat_set(sorted_unique_t,
             const container_type& cont,
             const key_compare& comp,
             const Alloc& a);
    template<class Alloc>
    flat_set(const flat_set&, const Alloc& a);
    template<class Alloc>
    flat_set(flat_set&&, const Alloc& a);
    template<class InputIter, class Alloc>
    flat_set(InputIter first, InputIter last, const Alloc& a);
    template<class InputIter, class Alloc>
    flat_set(InputIter first, InputIter last, const key_compare& comp, const Alloc& a);
    template<class InputIter, class Alloc>
    flat_set(sorted_unique_t, InputIter first, InputIter last, const Alloc& a);
    template<class InputIter, class Alloc>
    flat_set(sorted_unique_t,
             InputIter first,
             InputIter last,
             const key_compare& comp,
             const Alloc& a);
    template<container-compatible-range<value_type> R, class Alloc>
    flat_set(from_range_t, R&& rg, const Alloc& a);
    template<container-compatible-range<value_type> R, class Alloc>
    flat_set(from_range_t, R&& rg, const key_compare& comp, const Alloc& a);
    template<class Alloc>
    flat_set(initializer_list<value_type> il, const Alloc& a);
    template<class Alloc>
    flat_set(initializer_list<value_type> il, const key_compare& comp, const Alloc& a);
    template<class Alloc>
    flat_set(sorted_unique_t, initializer_list<value_type> il, const Alloc& a);
    template<class Alloc>
    flat_set(sorted_unique_t,
             initializer_list<value_type> il,
             const key_compare& comp,
             const Alloc& a);
 
    flat_set& operator=(initializer_list<value_type>);
 
    // iterators
    iterator begin() noexcept;
    const_iterator begin() const noexcept;
    iterator end() noexcept;
    const_iterator end() const noexcept;
 
    reverse_iterator rbegin() noexcept;
    const_reverse_iterator rbegin() const noexcept;
    reverse_iterator rend() noexcept;
    const_reverse_iterator rend() const noexcept;
 
    const_iterator cbegin() const noexcept;
    const_iterator cend() const noexcept;
    const_reverse_iterator crbegin() const noexcept;
    const_reverse_iterator crend() const noexcept;
 
    // capacity
    [[nodiscard]] bool empty() const noexcept;
    size_type size() const noexcept;
    size_type max_size() const noexcept;
 
    // modifiers
    template<class... Args>
    pair<iterator, bool> emplace(Args&&... args);
    template<class... Args>
    iterator emplace_hint(const_iterator position, Args&&... args);
 
    pair<iterator, bool> insert(const value_type& x) { return emplace(x); }
    pair<iterator, bool> insert(value_type&& x) { return emplace(std::move(x)); }
    template<class K>
    pair<iterator, bool> insert(K&& x);
    iterator insert(const_iterator position, const value_type& x)
    {
      return emplace_hint(position, x);
    }
    iterator insert(const_iterator position, value_type&& x)
    {
      return emplace_hint(position, std::move(x));
    }
    template<class K>
    iterator insert(const_iterator hint, K&& x);
 
    template<class InputIter>
    void insert(InputIter first, InputIter last);
    template<class InputIter>
    void insert(sorted_unique_t, InputIter first, InputIter last);
    template<container-compatible-range<value_type> R>
    void insert_range(R&& rg);
 
    void insert(initializer_list<value_type> il) { insert(il.begin(), il.end()); }
    void insert(sorted_unique_t s, initializer_list<value_type> il)
    {
      insert(s, il.begin(), il.end());
    }
 
    container_type extract() &&;
    void replace(container_type&&);
 
    iterator erase(iterator position);
    iterator erase(const_iterator position);
    size_type erase(const key_type& x);
    template<class K>
    size_type erase(K&& x);
    iterator erase(const_iterator first, const_iterator last);
 
    void swap(flat_set& y) noexcept;
    void clear() noexcept;
 
    // observers
    key_compare key_comp() const;
    value_compare value_comp() const;
 
    // set operations
    iterator find(const key_type& x);
    const_iterator find(const key_type& x) const;
    template<class K>
    iterator find(const K& x);
    template<class K>
    const_iterator find(const K& x) const;
 
    size_type count(const key_type& x) const;
    template<class K>
    size_type count(const K& x) const;
 
    bool contains(const key_type& x) const;
    template<class K>
    bool contains(const K& x) const;
 
    iterator lower_bound(const key_type& x);
    const_iterator lower_bound(const key_type& x) const;
    template<class K>
    iterator lower_bound(const K& x);
    template<class K>
    const_iterator lower_bound(const K& x) const;
 
    iterator upper_bound(const key_type& x);
    const_iterator upper_bound(const key_type& x) const;
    template<class K>
    iterator upper_bound(const K& x);
    template<class K>
    const_iterator upper_bound(const K& x) const;
 
    pair<iterator, iterator> equal_range(const key_type& x);
    pair<const_iterator, const_iterator> equal_range(const key_type& x) const;
    template<class K>
    pair<iterator, iterator> equal_range(const K& x);
    template<class K>
    pair<const_iterator, const_iterator> equal_range(const K& x) const;
 
    friend bool operator==(const flat_set& x, const flat_set& y);
 
    friend /*synth-three-way-result*/<value_type> operator<=>(const flat_set& x,
                                                              const flat_set& y);
 
    friend void swap(flat_set& x, flat_set& y) noexcept { x.swap(y); }
 
  private:
    container_type /*c*/;    // exposition only
    key_compare /*compare*/; // exposition only
  };
 
  template<class KeyContainer, class Compare = less<typename KeyContainer::value_type>>
  flat_set(KeyContainer, Compare = Compare())
    -> flat_set<typename KeyContainer::value_type, Compare, KeyContainer>;
  template<class KeyContainer, class Allocator>
  flat_set(KeyContainer, Allocator) -> flat_set<typename KeyContainer::value_type,
                                                less<typename KeyContainer::value_type>,
                                                KeyContainer>;
  template<class KeyContainer, class Compare, class Allocator>
  flat_set(KeyContainer, Compare, Allocator)
    -> flat_set<typename KeyContainer::value_type, Compare, KeyContainer>;
 
  template<class KeyContainer, class Compare = less<typename KeyContainer::value_type>>
  flat_set(sorted_unique_t, KeyContainer, Compare = Compare())
    -> flat_set<typename KeyContainer::value_type, Compare, KeyContainer>;
  template<class KeyContainer, class Allocator>
  flat_set(sorted_unique_t, KeyContainer, Allocator)
    -> flat_set<typename KeyContainer::value_type,
                less<typename KeyContainer::value_type>,
                KeyContainer>;
  template<class KeyContainer, class Compare, class Allocator>
  flat_set(sorted_unique_t, KeyContainer, Compare, Allocator)
    -> flat_set<typename KeyContainer::value_type, Compare, KeyContainer>;
 
  template<class InputIter, class Compare = less</*iter-value-type*/<InputIter>>>
  flat_set(InputIter, InputIter, Compare = Compare())
    -> flat_set</*iter-value-type*/<InputIter>, Compare>;
 
  template<class InputIter, class Compare = less</*iter-value-type*/<InputIter>>>
  flat_set(sorted_unique_t, InputIter, InputIter, Compare = Compare())
    -> flat_set</*iter-value-type*/<InputIter>, Compare>;
 
  template<ranges::input_range R,
           class Compare   = less<ranges::range_value_t<R>>,
           class Allocator = allocator<ranges::range_value_t<R>>>
  flat_set(from_range_t, R&&, Compare = Compare(), Allocator = Allocator())
    -> flat_set<ranges::range_value_t<R>,
                Compare,
                vector<ranges::range_value_t<R>,
                       /*alloc-rebind*/<Allocator, ranges::range_value_t<R>>>>;
 
  template<ranges::input_range R, class Allocator>
  flat_set(from_range_t, R&&, Allocator)
    -> flat_set<ranges::range_value_t<R>,
                less<ranges::range_value_t<R>>,
                vector<ranges::range_value_t<R>,
                       /*alloc-rebind*/<Allocator, ranges::range_value_t<R>>>>;
 
  template<class Key, class Compare = less<Key>>
  flat_set(initializer_list<Key>, Compare = Compare()) -> flat_set<Key, Compare>;
 
  template<class Key, class Compare = less<Key>>
  flat_set(sorted_unique_t, initializer_list<Key>, Compare = Compare())
    -> flat_set<Key, Compare>;
 
  template<class Key, class Compare, class KeyContainer, class Allocator>
  struct uses_allocator<flat_set<Key, Compare, KeyContainer>, Allocator>
    : bool_constant<uses_allocator_v<KeyContainer, Allocator>>
  {};
}

类模板 std::flat_multiset

namespace std {
  template<class Key, class Compare = less<Key>, class KeyContainer = vector<Key>>
  class flat_multiset
  {
  public:
    // types
    using key_type               = Key;
    using value_type             = Key;
    using key_compare            = Compare;
    using value_compare          = Compare;
    using reference              = value_type&;
    using const_reference        = const value_type&;
    using size_type              = typename KeyContainer::size_type;
    using difference_type        = typename KeyContainer::difference_type;
    using iterator               = /* implementation-defined */;
    using const_iterator         = /* implementation-defined */;
    using reverse_iterator       = std::reverse_iterator<iterator>;
    using const_reverse_iterator = std::reverse_iterator<const_iterator>;
    using container_type         = KeyContainer;
 
    // constructors
    flat_multiset()
      : flat_multiset(key_compare())
    {
    }
 
    explicit flat_multiset(const key_compare& comp)
      : /*c*/()
      , /*compare*/(comp)
    {
    }
 
    explicit flat_multiset(container_type cont, const key_compare& comp = key_compare());
 
    flat_multiset(sorted_equivalent_t,
                  container_type cont,
                  const key_compare& comp = key_compare())
      : /*c*/(std::move(cont))
      , /*compare*/(comp)
    {
    }
 
    template<class InputIter>
    flat_multiset(InputIter first,
                  InputIter last,
                  const key_compare& comp = key_compare())
      : /*c*/()
      , /*compare*/(comp)
    {
      insert(first, last);
    }
 
    template<class InputIter>
    flat_multiset(sorted_equivalent_t,
                  InputIter first,
                  InputIter last,
                  const key_compare& comp = key_compare())
      : /*c*/(first, last)
      , /*compare*/(comp)
    {
    }
 
    template<container-compatible-range<value_type> R>
    flat_multiset(from_range_t fr, R&& rg)
      : flat_multiset(fr, std::forward<R>(rg), key_compare())
    {
    }
    template<container-compatible-range<value_type> R>
    flat_multiset(from_range_t, R&& rg, const key_compare& comp)
      : flat_multiset(comp)
    {
      insert_range(std::forward<R>(rg));
    }
 
    flat_multiset(initializer_list<value_type> il,
                  const key_compare& comp = key_compare())
      : flat_multiset(il.begin(), il.end(), comp)
    {
    }
 
    flat_multiset(sorted_equivalent_t s,
                  initializer_list<value_type> il,
                  const key_compare& comp = key_compare())
      : flat_multiset(s, il.begin(), il.end(), comp)
    {
    }
 
    // constructors with allocators
 
    template<class Alloc>
    explicit flat_multiset(const Alloc& a);
    template<class Alloc>
    flat_multiset(const key_compare& comp, const Alloc& a);
    template<class Alloc>
    flat_multiset(const container_type& cont, const Alloc& a);
    template<class Alloc>
    flat_multiset(const container_type& cont, const key_compare& comp, const Alloc& a);
    template<class Alloc>
    flat_multiset(sorted_equivalent_t, const container_type& cont, const Alloc& a);
    template<class Alloc>
    flat_multiset(sorted_equivalent_t,
                  const container_type& cont,
                  const key_compare& comp,
                  const Alloc& a);
    template<class Alloc>
    flat_multiset(const flat_multiset&, const Alloc& a);
    template<class Alloc>
    flat_multiset(flat_multiset&&, const Alloc& a);
    template<class InputIter, class Alloc>
    flat_multiset(InputIter first, InputIter last, const Alloc& a);
    template<class InputIter, class Alloc>
    flat_multiset(InputIter first,
                  InputIter last,
                  const key_compare& comp,
                  const Alloc& a);
    template<class InputIter, class Alloc>
    flat_multiset(sorted_equivalent_t, InputIter first, InputIter last, const Alloc& a);
    template<class InputIter, class Alloc>
    flat_multiset(sorted_equivalent_t,
                  InputIter first,
                  InputIter last,
                  const key_compare& comp,
                  const Alloc& a);
    template<container-compatible-range<value_type> R, class Alloc>
    flat_multiset(from_range_t, R&& rg, const Alloc& a);
    template<container-compatible-range<value_type> R, class Alloc>
    flat_multiset(from_range_t, R&& rg, const key_compare& comp, const Alloc& a);
    template<class Alloc>
    flat_multiset(initializer_list<value_type> il, const Alloc& a);
    template<class Alloc>
    flat_multiset(initializer_list<value_type> il,
                  const key_compare& comp,
                  const Alloc& a);
    template<class Alloc>
    flat_multiset(sorted_equivalent_t, initializer_list<value_type> il, const Alloc& a);
    template<class Alloc>
    flat_multiset(sorted_equivalent_t,
                  initializer_list<value_type> il,
                  const key_compare& comp,
                  const Alloc& a);
 
    flat_multiset& operator=(initializer_list<value_type>);
 
    // iterators
    iterator begin() noexcept;
    const_iterator begin() const noexcept;
    iterator end() noexcept;
    const_iterator end() const noexcept;
 
    reverse_iterator rbegin() noexcept;
    const_reverse_iterator rbegin() const noexcept;
    reverse_iterator rend() noexcept;
    const_reverse_iterator rend() const noexcept;
 
    const_iterator cbegin() const noexcept;
    const_iterator cend() const noexcept;
    const_reverse_iterator crbegin() const noexcept;
    const_reverse_iterator crend() const noexcept;
 
    // capacity
    [[nodiscard]] bool empty() const noexcept;
    size_type size() const noexcept;
    size_type max_size() const noexcept;
 
    // modifiers
    template<class... Args>
    iterator emplace(Args&&... args);
    template<class... Args>
    iterator emplace_hint(const_iterator position, Args&&... args);
 
    iterator insert(const value_type& x) { return emplace(x); }
    iterator insert(value_type&& x) { return emplace(std::move(x)); }
    iterator insert(const_iterator position, const value_type& x)
    {
      return emplace_hint(position, x);
    }
    iterator insert(const_iterator position, value_type&& x)
    {
      return emplace_hint(position, std::move(x));
    }
 
    template<class InputIter>
    void insert(InputIter first, InputIter last);
    template<class InputIter>
    void insert(sorted_equivalent_t, InputIter first, InputIter last);
    template<container-compatible-range<value_type> R>
    void insert_range(R&& rg);
 
    void insert(initializer_list<value_type> il) { insert(il.begin(), il.end()); }
    void insert(sorted_equivalent_t s, initializer_list<value_type> il)
    {
      insert(s, il.begin(), il.end());
    }
 
    container_type extract() &&;
    void replace(container_type&&);
 
    iterator erase(iterator position);
    iterator erase(const_iterator position);
    size_type erase(const key_type& x);
    template<class K>
    size_type erase(K&& x);
    iterator erase(const_iterator first, const_iterator last);
 
    void swap(flat_multiset& y) noexcept;
    void clear() noexcept;
 
    // observers
    key_compare key_comp() const;
    value_compare value_comp() const;
 
    // set operations
    iterator find(const key_type& x);
    const_iterator find(const key_type& x) const;
    template<class K>
    iterator find(const K& x);
    template<class K>
    const_iterator find(const K& x) const;
 
    size_type count(const key_type& x) const;
    template<class K>
    size_type count(const K& x) const;
 
    bool contains(const key_type& x) const;
    template<class K>
    bool contains(const K& x) const;
 
    iterator lower_bound(const key_type& x);
    const_iterator lower_bound(const key_type& x) const;
    template<class K>
    iterator lower_bound(const K& x);
    template<class K>
    const_iterator lower_bound(const K& x) const;
 
    iterator upper_bound(const key_type& x);
    const_iterator upper_bound(const key_type& x) const;
    template<class K>
    iterator upper_bound(const K& x);
    template<class K>
    const_iterator upper_bound(const K& x) const;
 
    pair<iterator, iterator> equal_range(const key_type& x);
    pair<const_iterator, const_iterator> equal_range(const key_type& x) const;
    template<class K>
    pair<iterator, iterator> equal_range(const K& x);
    template<class K>
    pair<const_iterator, const_iterator> equal_range(const K& x) const;
 
    friend bool operator==(const flat_multiset& x, const flat_multiset& y);
 
    friend /*synth-three-way-result*/<value_type> operator<=>(const flat_multiset& x,
                                                              const flat_multiset& y);
 
    friend void swap(flat_multiset& x, flat_multiset& y) noexcept { x.swap(y); }
 
  private:
    container_type /*c*/;    // exposition only
    key_compare /*compare*/; // exposition only
  };
 
  template<class KeyContainer, class Compare = less<typename KeyContainer::value_type>>
  flat_multiset(KeyContainer, Compare = Compare())
    -> flat_multiset<typename KeyContainer::value_type, Compare, KeyContainer>;
  template<class KeyContainer, class Allocator>
  flat_multiset(KeyContainer, Allocator)
    -> flat_multiset<typename KeyContainer::value_type,
                     less<typename KeyContainer::value_type>,
                     KeyContainer>;
  template<class KeyContainer, class Compare, class Allocator>
  flat_multiset(KeyContainer, Compare, Allocator)
    -> flat_multiset<typename KeyContainer::value_type, Compare, KeyContainer>;
 
  template<class KeyContainer, class Compare = less<typename KeyContainer::value_type>>
  flat_multiset(sorted_equivalent_t, KeyContainer, Compare = Compare())
    -> flat_multiset<typename KeyContainer::value_type, Compare, KeyContainer>;
  template<class KeyContainer, class Allocator>
  flat_multiset(sorted_equivalent_t, KeyContainer, Allocator)
    -> flat_multiset<typename KeyContainer::value_type,
                     less<typename KeyContainer::value_type>,
                     KeyContainer>;
  template<class KeyContainer, class Compare, class Allocator>
  flat_multiset(sorted_equivalent_t, KeyContainer, Compare, Allocator)
    -> flat_multiset<typename KeyContainer::value_type, Compare, KeyContainer>;
 
  template<class InputIter, class Compare = less</*iter-value-type*/<InputIter>>>
  flat_multiset(InputIter, InputIter, Compare = Compare())
    -> flat_multiset</*iter-value-type*/<InputIter>, Compare>;
 
  template<class InputIter, class Compare = less</*iter-value-type*/<InputIter>>>
  flat_multiset(sorted_equivalent_t, InputIter, InputIter, Compare = Compare())
    -> flat_multiset</*iter-value-type*/<InputIter>, Compare>;
 
  template<ranges::input_range R,
           class Compare   = less<ranges::range_value_t<R>>,
           class Allocator = allocator<ranges::range_value_t<R>>>
  flat_multiset(from_range_t, R&&, Compare = Compare(), Allocator = Allocator())
    -> flat_multiset<ranges::range_value_t<R>,
                     Compare,
                     vector<ranges::range_value_t<R>,
                            /*alloc-rebind*/<Allocator, ranges::range_value_t<R>>>>;
 
  template<ranges::input_range R, class Allocator>
  flat_multiset(from_range_t, R&&, Allocator)
    -> flat_multiset<ranges::range_value_t<R>,
                     less<ranges::range_value_t<R>>,
                     vector<ranges::range_value_t<R>,
                            /*alloc-rebind*/<Allocator, ranges::range_value_t<R>>>>;
 
  template<class Key, class Compare = less<Key>>
  flat_multiset(initializer_list<Key>, Compare = Compare())
    -> flat_multiset<Key, Compare>;
 
  template<class Key, class Compare = less<Key>>
  flat_multiset(sorted_equivalent_t, initializer_list<Key>, Compare = Compare())
    -> flat_multiset<Key, Compare>;
 
  template<class Key, class Compare, class KeyContainer, class Allocator>
  struct uses_allocator<flat_multiset<Key, Compare, KeyContainer>, Allocator>
    : bool_constant<uses_allocator_v<KeyContainer, Allocator>>
  {};
}

参考资料

• C++23 标准 (ISO/IEC 14882:2024)

• 24.6.5 头文件 <flat_set> 提要 [flat.set.syn]

• 24.6.11.2 定义 [flat.set.defn]

• 24.6.12.2 定义 [flat.multiset.defn]