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[flat.multimap.cons]
# 23 Containers library [[containers]](./#containers)
## 23.6 Container adaptors [[container.adaptors]](container.adaptors#flat.multimap.cons)
### 23.6.9 Class template flat_multimap [[flat.multimap]](flat.multimap#cons)
#### 23.6.9.3 Constructors [flat.multimap.cons]
[🔗](#lib:flat_multimap,constructor)
`constexpr flat_multimap(key_container_type key_cont, mapped_container_type mapped_cont,
const key_compare& comp = key_compare());
`
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18586)
*Effects*: Initializes*c*.keys with std​::​move(key_cont),*c*.values with std​::​move(mapped_cont), and*compare* with comp;
sorts the range [begin(), end()) with respect to value_comp()[.](#1.sentence-1)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18594)
*Complexity*: Linear in N if the container arguments are already sorted
with respect to value_comp() and otherwise NlogN,
where N is the value of key_cont.size() before this call[.](#2.sentence-1)
[🔗](#lib:flat_multimap,constructor_)
`constexpr flat_multimap(sorted_equivalent_t, key_container_type key_cont,
mapped_container_type mapped_cont,
const key_compare& comp = key_compare());
`
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18609)
*Effects*: Initializes*c*.keys with std​::​move(key_cont),*c*.values with std​::​move(mapped_cont), and*compare* with comp[.](#3.sentence-1)
[4](#4)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18616)
*Complexity*: Constant[.](#4.sentence-1)

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[flat.multimap.cons.alloc]
# 23 Containers library [[containers]](./#containers)
## 23.6 Container adaptors [[container.adaptors]](container.adaptors#flat.multimap.cons.alloc)
### 23.6.9 Class template flat_multimap [[flat.multimap]](flat.multimap#cons.alloc)
#### 23.6.9.4 Constructors with allocators [flat.multimap.cons.alloc]
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18623)
The constructors in this subclause shall not participate in overload resolution
unless uses_allocator_v<key_container_type, Alloc> is true and uses_allocator_v<mapped_container_type, Alloc> is true[.](#1.sentence-1)
[🔗](#lib:flat_multimap,constructor)
`template<class Alloc>
constexpr flat_multimap(const key_container_type& key_cont,
const mapped_container_type& mapped_cont, const Alloc& a);
template<class Alloc>
constexpr flat_multimap(const key_container_type& key_cont,
const mapped_container_type& mapped_cont,
const key_compare& comp, const Alloc& a);
`
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18640)
*Effects*: Equivalent to flat_multimap(key_cont, mapped_cont) andflat_multimap(key_cont, mapped_cont, comp), respectively,
except that *c*.keys and *c*.values are constructed
with uses-allocator construction ([[allocator.uses.construction]](allocator.uses.construction "20.2.8.2 Uses-allocator construction"))[.](#2.sentence-1)
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18647)
*Complexity*: Same as flat_multimap(key_cont, mapped_cont) andflat_multimap(key_cont, mapped_cont, comp), respectively[.](#3.sentence-1)
[🔗](#lib:flat_multimap,constructor_)
`template<class Alloc>
constexpr flat_multimap(sorted_equivalent_t, const key_container_type& key_cont,
const mapped_container_type& mapped_cont, const Alloc& a);
template<class Alloc>
constexpr flat_multimap(sorted_equivalent_t, const key_container_type& key_cont,
const mapped_container_type& mapped_cont, const key_compare& comp,
const Alloc& a);
`
[4](#4)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18665)
*Effects*: Equivalent to flat_multimap(sorted_equivalent, key_cont, mapped_cont) andflat_multimap(sorted_equivalent, key_cont, mapped_cont, comp), respectively,
except that *c*.keys and *c*.values are constructed
with uses-allocator construction ([[allocator.uses.construction]](allocator.uses.construction "20.2.8.2 Uses-allocator construction"))[.](#4.sentence-1)
[5](#5)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18672)
*Complexity*: Linear[.](#5.sentence-1)
[🔗](#lib:flat_multimap,constructor__)
`template<class Alloc>
constexpr explicit flat_multimap(const Alloc& a);
template<class Alloc>
constexpr flat_multimap(const key_compare& comp, const Alloc& a);
template<class Alloc>
constexpr flat_multimap(const flat_multimap&, const Alloc& a);
template<class Alloc>
constexpr flat_multimap(flat_multimap&&, const Alloc& a);
template<class InputIterator, class Alloc>
constexpr flat_multimap(InputIterator first, InputIterator last, const Alloc& a);
template<class InputIterator, class Alloc>
constexpr flat_multimap(InputIterator first, InputIterator last, const key_compare& comp,
const Alloc& a);
template<class InputIterator, class Alloc>
constexpr flat_multimap(sorted_equivalent_t, InputIterator first, InputIterator last,
const Alloc& a);
template<class InputIterator, class Alloc>
constexpr flat_multimap(sorted_equivalent_t, InputIterator first, InputIterator last,
const key_compare& comp, const Alloc& a);
template<[container-compatible-range](container.intro.reqmts#concept:container-compatible-range "23.2.2.1 Introduction [container.intro.reqmts]")<value_type> R, class Alloc>
constexpr flat_multimap(from_range_t, R&& rg, const Alloc& a);
template<[container-compatible-range](container.intro.reqmts#concept:container-compatible-range "23.2.2.1 Introduction [container.intro.reqmts]")<value_type> R, class Alloc>
constexpr flat_multimap(from_range_t, R&& rg, const key_compare& comp, const Alloc& a);
template<class Alloc>
constexpr flat_multimap(initializer_list<value_type> il, const Alloc& a);
template<class Alloc>
constexpr flat_multimap(initializer_list<value_type> il, const key_compare& comp,
const Alloc& a);
template<class Alloc>
constexpr flat_multimap(sorted_equivalent_t, initializer_list<value_type> il, const Alloc& a);
template<class Alloc>
constexpr flat_multimap(sorted_equivalent_t, initializer_list<value_type> il,
const key_compare& comp, const Alloc& a);
`
[6](#6)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18715)
*Effects*: Equivalent to the corresponding non-allocator constructors
except that *c*.keys and *c*.values are constructed
with uses-allocator construction ([[allocator.uses.construction]](allocator.uses.construction "20.2.8.2 Uses-allocator construction"))[.](#6.sentence-1)

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[flat.multimap.defn]
# 23 Containers library [[containers]](./#containers)
## 23.6 Container adaptors [[container.adaptors]](container.adaptors#flat.multimap.defn)
### 23.6.9 Class template flat_multimap [[flat.multimap]](flat.multimap#defn)
#### 23.6.9.2 Definition [flat.multimap.defn]
namespace std {template<class Key, class T, class Compare = less<Key>, class KeyContainer = vector<Key>, class MappedContainer = vector<T>>class flat_multimap {public:// typesusing key_type = Key; using mapped_type = T; using value_type = pair<key_type, mapped_type>; using key_compare = Compare; using reference = pair<const key_type&, mapped_type&>; using const_reference = pair<const key_type&, const mapped_type&>; using size_type = size_t; using difference_type = ptrdiff_t; using iterator = *implementation-defined*; // see [[container.requirements]](container.requirements "23.2 Requirements")using const_iterator = *implementation-defined*; // see [[container.requirements]](container.requirements "23.2 Requirements")using reverse_iterator = std::reverse_iterator<iterator>; using const_reverse_iterator = std::reverse_iterator<const_iterator>; using key_container_type = KeyContainer; using mapped_container_type = MappedContainer; class value_compare {private: key_compare *comp*; // *exposition only*constexpr value_compare(key_compare c) : *comp*(c) { } // *exposition only*public:constexpr bool operator()(const_reference x, const_reference y) const {return *comp*(x.first, y.first); }}; struct containers { key_container_type keys;
mapped_container_type values; }; // [[flat.multimap.cons]](flat.multimap.cons "23.6.9.3 Constructors"), constructorsconstexpr flat_multimap() : flat_multimap(key_compare()) { }constexpr explicit flat_multimap(const key_compare& comp): *c*(), *compare*(comp) { }constexpr flat_multimap(key_container_type key_cont, mapped_container_type mapped_cont, const key_compare& comp = key_compare()); constexpr flat_multimap(sorted_equivalent_t,
key_container_type key_cont, mapped_container_type mapped_cont, const key_compare& comp = key_compare()); template<class InputIterator>constexpr flat_multimap(InputIterator first, InputIterator last, const key_compare& comp = key_compare()): *c*(), *compare*(comp){ insert(first, last); }template<class InputIterator>constexpr flat_multimap(sorted_equivalent_t, InputIterator first, InputIterator last, const key_compare& comp = key_compare()): *c*(), *compare*(comp) { insert(sorted_equivalent, first, last); }template<[*container-compatible-range*](container.intro.reqmts#concept:container-compatible-range "23.2.2.1 Introduction [container.intro.reqmts]")<value_type> R>constexpr flat_multimap(from_range_t, R&& rg): flat_multimap(from_range, std::forward<R>(rg), key_compare()) { }template<[*container-compatible-range*](container.intro.reqmts#concept:container-compatible-range "23.2.2.1 Introduction [container.intro.reqmts]")<value_type> R>constexpr flat_multimap(from_range_t, R&& rg, const key_compare& comp): flat_multimap(comp) { insert_range(std::forward<R>(rg)); }constexpr flat_multimap(initializer_list<value_type> il, const key_compare& comp = key_compare()): flat_multimap(il.begin(), il.end(), comp) { }constexpr flat_multimap(sorted_equivalent_t, initializer_list<value_type> il, const key_compare& comp = key_compare()): flat_multimap(sorted_equivalent, il.begin(), il.end(), comp) { }// [[flat.multimap.cons.alloc]](flat.multimap.cons.alloc "23.6.9.4 Constructors with allocators"), constructors with allocatorstemplate<class Alloc>constexpr explicit flat_multimap(const Alloc& a); template<class Alloc>constexpr flat_multimap(const key_compare& comp, const Alloc& a); template<class Alloc>constexpr flat_multimap(const key_container_type& key_cont, const mapped_container_type& mapped_cont, const Alloc& a); template<class Alloc>constexpr flat_multimap(const key_container_type& key_cont, const mapped_container_type& mapped_cont, const key_compare& comp, const Alloc& a); template<class Alloc>constexpr flat_multimap(sorted_equivalent_t, const key_container_type& key_cont, const mapped_container_type& mapped_cont, const Alloc& a); template<class Alloc>constexpr flat_multimap(sorted_equivalent_t, const key_container_type& key_cont, const mapped_container_type& mapped_cont, const key_compare& comp, const Alloc& a); template<class Alloc>constexpr flat_multimap(const flat_multimap&, const Alloc& a); template<class Alloc>constexpr flat_multimap(flat_multimap&&, const Alloc& a); template<class InputIterator, class Alloc>constexpr flat_multimap(InputIterator first, InputIterator last, const Alloc& a); template<class InputIterator, class Alloc>constexpr flat_multimap(InputIterator first, InputIterator last, const key_compare& comp, const Alloc& a); template<class InputIterator, class Alloc>constexpr flat_multimap(sorted_equivalent_t, InputIterator first, InputIterator last, const Alloc& a); template<class InputIterator, class Alloc>constexpr flat_multimap(sorted_equivalent_t, InputIterator first, InputIterator last, const key_compare& comp, const Alloc& a); template<[*container-compatible-range*](container.intro.reqmts#concept:container-compatible-range "23.2.2.1 Introduction [container.intro.reqmts]")<value_type> R, class Alloc>constexpr flat_multimap(from_range_t, R&& rg, const Alloc& a); template<[*container-compatible-range*](container.intro.reqmts#concept:container-compatible-range "23.2.2.1 Introduction [container.intro.reqmts]")<value_type> R, class Alloc>constexpr flat_multimap(from_range_t, R&& rg, const key_compare& comp, const Alloc& a); template<class Alloc>constexpr flat_multimap(initializer_list<value_type> il, const Alloc& a); template<class Alloc>constexpr flat_multimap(initializer_list<value_type> il, const key_compare& comp, const Alloc& a); template<class Alloc>constexpr flat_multimap(sorted_equivalent_t, initializer_list<value_type> il, const Alloc& a); template<class Alloc>constexpr flat_multimap(sorted_equivalent_t, initializer_list<value_type> il, const key_compare& comp, const Alloc& a);
flat_multimap& operator=(initializer_list<value_type>); // iteratorsconstexpr iterator begin() noexcept; constexpr const_iterator begin() const noexcept; constexpr iterator end() noexcept; constexpr const_iterator end() const noexcept; constexpr reverse_iterator rbegin() noexcept; constexpr const_reverse_iterator rbegin() const noexcept; constexpr reverse_iterator rend() noexcept; constexpr const_reverse_iterator rend() const noexcept; constexpr const_iterator cbegin() const noexcept; constexpr const_iterator cend() const noexcept; constexpr const_reverse_iterator crbegin() const noexcept; constexpr const_reverse_iterator crend() const noexcept; // capacityconstexpr bool empty() const noexcept; constexpr size_type size() const noexcept; constexpr size_type max_size() const noexcept; // modifierstemplate<class... Args> constexpr iterator emplace(Args&&... args); template<class... Args>constexpr iterator emplace_hint(const_iterator position, Args&&... args); constexpr iterator insert(const value_type& x){ return emplace(x); }constexpr iterator insert(value_type&& x){ return emplace(std::move(x)); }constexpr iterator insert(const_iterator position, const value_type& x){ return emplace_hint(position, x); }constexpr iterator insert(const_iterator position, value_type&& x){ return emplace_hint(position, std::move(x)); }template<class P> constexpr iterator insert(P&& x); template<class P>constexpr iterator insert(const_iterator position, P&&); template<class InputIterator>constexpr void insert(InputIterator first, InputIterator last); template<class InputIterator>constexpr void insert(sorted_equivalent_t, InputIterator first, InputIterator last); template<[*container-compatible-range*](container.intro.reqmts#concept:container-compatible-range "23.2.2.1 Introduction [container.intro.reqmts]")<value_type> R>constexpr void insert_range(R&& rg); constexpr void insert(initializer_list<value_type> il){ insert(il.begin(), il.end()); }constexpr void insert(sorted_equivalent_t, initializer_list<value_type> il){ insert(sorted_equivalent, il.begin(), il.end()); }constexpr containers extract() &&; constexpr void replace(key_container_type&& key_cont, mapped_container_type&& mapped_cont); constexpr iterator erase(iterator position); constexpr iterator erase(const_iterator position); constexpr size_type erase(const key_type& x); template<class K> constexpr size_type erase(K&& x); constexpr iterator erase(const_iterator first, const_iterator last); constexpr void swap(flat_multimap&) noexcept; constexpr void clear() noexcept; // observersconstexpr key_compare key_comp() const; constexpr value_compare value_comp() const; constexpr const key_container_type& keys() const noexcept { return *c*.keys; }constexpr const mapped_container_type& values() const noexcept { return *c*.values; }// map operationsconstexpr iterator find(const key_type& x); constexpr const_iterator find(const key_type& x) const; template<class K> constexpr iterator find(const K& x); template<class K> constexpr const_iterator find(const K& x) const; constexpr size_type count(const key_type& x) const; template<class K> constexpr size_type count(const K& x) const; constexpr bool contains(const key_type& x) const; template<class K> constexpr bool contains(const K& x) const; constexpr iterator lower_bound(const key_type& x); constexpr const_iterator lower_bound(const key_type& x) const; template<class K> constexpr iterator lower_bound(const K& x); template<class K> constexpr const_iterator lower_bound(const K& x) const; constexpr iterator upper_bound(const key_type& x); constexpr const_iterator upper_bound(const key_type& x) const; template<class K> constexpr iterator upper_bound(const K& x); template<class K> constexpr const_iterator upper_bound(const K& x) const; constexpr pair<iterator, iterator> equal_range(const key_type& x); constexpr pair<const_iterator, const_iterator> equal_range(const key_type& x) const; template<class K>constexpr pair<iterator, iterator> equal_range(const K& x); template<class K>constexpr pair<const_iterator, const_iterator> equal_range(const K& x) const; friend constexpr bool operator==(const flat_multimap& x, const flat_multimap& y); friend constexpr *synth-three-way-result*<value_type>operator<=>(const flat_multimap& x, const flat_multimap& y); friend constexpr void swap(flat_multimap& x, flat_multimap& y) noexcept{ x.swap(y); }private: containers *c*; // *exposition only* key_compare *compare*; // *exposition only*}; template<class KeyContainer, class MappedContainer, class Compare = less<typename KeyContainer::value_type>> flat_multimap(KeyContainer, MappedContainer, Compare = Compare())-> flat_multimap<typename KeyContainer::value_type, typename MappedContainer::value_type,
Compare, KeyContainer, MappedContainer>; template<class KeyContainer, class MappedContainer, class Allocator> flat_multimap(KeyContainer, MappedContainer, Allocator)-> flat_multimap<typename KeyContainer::value_type, typename MappedContainer::value_type,
less<typename KeyContainer::value_type>, KeyContainer, MappedContainer>; template<class KeyContainer, class MappedContainer, class Compare, class Allocator> flat_multimap(KeyContainer, MappedContainer, Compare, Allocator)-> flat_multimap<typename KeyContainer::value_type, typename MappedContainer::value_type,
Compare, KeyContainer, MappedContainer>; template<class KeyContainer, class MappedContainer, class Compare = less<typename KeyContainer::value_type>> flat_multimap(sorted_equivalent_t, KeyContainer, MappedContainer, Compare = Compare())-> flat_multimap<typename KeyContainer::value_type, typename MappedContainer::value_type,
Compare, KeyContainer, MappedContainer>; template<class KeyContainer, class MappedContainer, class Allocator> flat_multimap(sorted_equivalent_t, KeyContainer, MappedContainer, Allocator)-> flat_multimap<typename KeyContainer::value_type, typename MappedContainer::value_type,
less<typename KeyContainer::value_type>, KeyContainer, MappedContainer>; template<class KeyContainer, class MappedContainer, class Compare, class Allocator> flat_multimap(sorted_equivalent_t, KeyContainer, MappedContainer, Compare, Allocator)-> flat_multimap<typename KeyContainer::value_type, typename MappedContainer::value_type,
Compare, KeyContainer, MappedContainer>; template<class InputIterator, class Compare = less<*iter-key-type*<InputIterator>>> flat_multimap(InputIterator, InputIterator, Compare = Compare())-> flat_multimap<*iter-key-type*<InputIterator>, *iter-mapped-type*<InputIterator>, Compare>; template<class InputIterator, class Compare = less<*iter-key-type*<InputIterator>>> flat_multimap(sorted_equivalent_t, InputIterator, InputIterator, Compare = Compare())-> flat_multimap<*iter-key-type*<InputIterator>, *iter-mapped-type*<InputIterator>, Compare>; template<ranges::[input_range](range.refinements#concept:input_range "25.4.6 Other range refinements [range.refinements]") R, class Compare = less<*range-key-type*<R>>, class Allocator = allocator<byte>> flat_multimap(from_range_t, R&&, Compare = Compare(), Allocator = Allocator())-> flat_multimap<*range-key-type*<R>, *range-mapped-type*<R>, Compare,
vector<*range-key-type*<R>, *alloc-rebind*<Allocator, *range-key-type*<R>>>,
vector<*range-mapped-type*<R>, *alloc-rebind*<Allocator, *range-mapped-type*<R>>>>; template<ranges::[input_range](range.refinements#concept:input_range "25.4.6 Other range refinements [range.refinements]") R, class Allocator> flat_multimap(from_range_t, R&&, Allocator)-> flat_multimap<*range-key-type*<R>, *range-mapped-type*<R>, less<*range-key-type*<R>>,
vector<*range-key-type*<R>, *alloc-rebind*<Allocator, *range-key-type*<R>>>,
vector<*range-mapped-type*<R>, *alloc-rebind*<Allocator, *range-mapped-type*<R>>>>; template<class Key, class T, class Compare = less<Key>> flat_multimap(initializer_list<pair<Key, T>>, Compare = Compare())-> flat_multimap<Key, T, Compare>; template<class Key, class T, class Compare = less<Key>> flat_multimap(sorted_equivalent_t, initializer_list<pair<Key, T>>, Compare = Compare())-> flat_multimap<Key, T, Compare>; template<class Key, class T, class Compare, class KeyContainer, class MappedContainer, class Allocator>struct uses_allocator<flat_multimap<Key, T, Compare, KeyContainer, MappedContainer>,
Allocator>: bool_constant<uses_allocator_v<KeyContainer, Allocator> && uses_allocator_v<MappedContainer, Allocator>> { };}
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18572)
The member type containers has the data members and special members
specified above[.](#1.sentence-1)
It has no base classes or members other than those
specified[.](#1.sentence-2)

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[flat.multimap.erasure]
# 23 Containers library [[containers]](./#containers)
## 23.6 Container adaptors [[container.adaptors]](container.adaptors#flat.multimap.erasure)
### 23.6.9 Class template flat_multimap [[flat.multimap]](flat.multimap#erasure)
#### 23.6.9.5 Erasure [flat.multimap.erasure]
[🔗](#lib:erase_if,flat_multimap)
`template<class Key, class T, class Compare, class KeyContainer, class MappedContainer,
class Predicate>
constexpr typename flat_multimap<Key, T, Compare, KeyContainer, MappedContainer>::size_type
erase_if(flat_multimap<Key, T, Compare, KeyContainer, MappedContainer>& c, Predicate pred);
`
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18733)
*Preconditions*: Key and T meet the *Cpp17MoveAssignable* requirements[.](#1.sentence-1)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18737)
*Effects*: Let E be bool(pred(pair<const Key&, const T&>(e)))[.](#2.sentence-1)
Erases all elements e in c for which E holds[.](#2.sentence-2)
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18742)
*Returns*: The number of elements erased[.](#3.sentence-1)
[4](#4)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18746)
*Complexity*: Exactly c.size() applications of the predicate[.](#4.sentence-1)
[5](#5)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18750)
*Remarks*: Stable ([[algorithm.stable]](algorithm.stable "16.4.6.8 Requirements for stable algorithms"))[.](#5.sentence-1)
If an invocation of erase_if exits via an exception,c is in a valid but unspecified state ([[defns.valid]](defns.valid "3.67 valid but unspecified state"))[.](#5.sentence-2)
[*Note [1](#note-1)*:
c still meets its invariants,
but can be empty[.](#5.sentence-3)
— *end note*]

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[flat.multimap.overview]
# 23 Containers library [[containers]](./#containers)
## 23.6 Container adaptors [[container.adaptors]](container.adaptors#flat.multimap.overview)
### 23.6.9 Class template flat_multimap [[flat.multimap]](flat.multimap#overview)
#### 23.6.9.1 Overview [flat.multimap.overview]
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18148)
A flat_multimap is a container adaptor
that provides an associative container interface
that supports equivalent keys
(i.e., possibly containing multiple copies of the same key value) and
provides for fast retrieval of values of another type T based on the keys[.](#1.sentence-1)
flat_multimap supports iterators that meet
the *Cpp17InputIterator* requirements and
model the[random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]") concept ([[iterator.concept.random.access]](iterator.concept.random.access "24.3.4.13 Concept random_­access_­iterator"))[.](#1.sentence-2)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18161)
A flat_multimap meets all of the requirements
for a container ([[container.reqmts]](container.reqmts "23.2.2.2 Container requirements")) and
for a reversible container ([[container.rev.reqmts]](container.rev.reqmts "23.2.2.3 Reversible container requirements")),
plus the optional container requirements ([[container.opt.reqmts]](container.opt.reqmts "23.2.2.4 Optional container requirements"))[.](#2.sentence-1)
flat_multimap meets the requirements of
an associative container ([[associative.reqmts]](associative.reqmts "23.2.7 Associative containers")), except that:
- [(2.1)](#2.1)
it does not meet the requirements related to node handles ([[container.node]](container.node "23.2.5 Node handles")),
- [(2.2)](#2.2)
it does not meet the requirements related to iterator invalidation, and
- [(2.3)](#2.3)
the time complexity of the operations
that insert or erase a single element from the map is linear,
including the ones that take an insertion position iterator[.](#2.sentence-2)
[*Note [1](#note-1)*:
A flat_multimap does not meet the additional requirements of an
allocator-aware container ([[container.alloc.reqmts]](container.alloc.reqmts "23.2.2.5 Allocator-aware containers"))[.](#2.sentence-3)
— *end note*]
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18183)
A flat_multimap also provides most operations described
in [[associative.reqmts]](associative.reqmts "23.2.7 Associative containers") for equal keys[.](#3.sentence-1)
This means that a flat_multimap supports
the a_eq operations in [[associative.reqmts]](associative.reqmts "23.2.7 Associative containers") but not the a_uniq operations[.](#3.sentence-2)
For a flat_multimap<Key, T> the key_type is Key and
the value_type is pair<Key, T>[.](#3.sentence-3)
[4](#4)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18193)
Except as otherwise noted,
operations on flat_multimap are equivalent to those of flat_map,
except that flat_multimap operations
do not remove or replace elements with equal keys[.](#4.sentence-1)
[*Example [1](#example-1)*:
flat_multimap constructors and emplace do not erase
non-unique elements after sorting them[.](#4.sentence-2)
— *end example*]
[5](#5)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18203)
A flat_multimap maintains the following invariants:
- [(5.1)](#5.1)
it contains the same number of keys and values;
- [(5.2)](#5.2)
the keys are sorted with respect to the comparison object; and
- [(5.3)](#5.3)
the value at offset off within the value container is the value
associated with the key at offset off within the key container[.](#5.sentence-1)
[6](#6)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18215)
If any member function in [[flat.multimap.defn]](flat.multimap.defn "23.6.9.2 Definition") exits via an exception,
the invariants are restored[.](#6.sentence-1)
[*Note [2](#note-2)*:
This can result in the flat_multimap being emptied[.](#6.sentence-2)
— *end note*]
[7](#7)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18222)
Any type C that meets the sequence container requirements ([[sequence.reqmts]](sequence.reqmts "23.2.4 Sequence containers"))
can be used to instantiate flat_multimap,
as long asC​::​iterator meets the *Cpp17RandomAccessIterator* requirements and
invocations of
member functions C​::​size and C​::​max_size do not exit via an exception[.](#7.sentence-1)
In particular,vector ([[vector]](vector "23.3.13 Class template vector")) and deque ([[deque]](deque "23.3.5 Class template deque")) can be used[.](#7.sentence-2)
[*Note [3](#note-3)*:
vector<bool> is not a sequence container[.](#7.sentence-3)
— *end note*]
[8](#8)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18236)
The program is ill-formed ifKey is not the same type as KeyContainer​::​value_type orT is not the same type as MappedContainer​::​value_type[.](#8.sentence-1)
[9](#9)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18241)
The effect of calling a constructor
that takes both key_container_type andmapped_container_type arguments
with containers of different sizes is undefined[.](#9.sentence-1)
[10](#10)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18247)
The effect of calling a constructor or member function
that takes a sorted_equivalent_t argument
with a container, containers, or range
that are not sorted with respect to key_comp() is undefined[.](#10.sentence-1)
[11](#11)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L18253)
The types iterator and const_iterator meet
the constexpr iterator requirements ([[iterator.requirements.general]](iterator.requirements.general "24.3.1 General"))[.](#11.sentence-1)