deduction guides for std::multiset

 

C++

Compiler support

Freestanding and hosted

Language

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Technical specifications

Symbols index

External libraries

 

Containers library

Sequence

array (C++11)

vector

deque

forward_list (C++11)

list

Associative

set

multiset

map

multimap

Unordered associative

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

Adaptors

stack

queue

priority_queue

Views

span (C++20)

 

std::multiset

Member functions

multiset::multiset

multiset::~multiset

multiset::operator=

multiset::get_allocator

Iterators

multiset::beginmultiset::cbegin (C++11)

multiset::endmultiset::cend (C++11)

multiset::rbeginmultiset::crbegin (C++11)

multiset::rendmultiset::crend (C++11)

Capacity

multiset::empty

multiset::size

multiset::max_size

Modifiers

multiset::clear

multiset::insert

multiset::emplace (C++11)

multiset::emplace_hint (C++11)

multiset::erase

multiset::swap

multiset::extract (C++17)

multiset::merge (C++17)

Lookup

multiset::count

multiset::find

multiset::contains (C++20)

multiset::equal_range

multiset::lower_bound

multiset::upper_bound

Observers

multiset::key_comp

multiset::value_comp

Non-member functions

std::swap

erase_if (C++20)

operator==operator!=operator<operator>operator<=operator>=operator<=> (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)(C++20)

Deduction guides(C++17)

 

Defined in header <set>
template<class InputIt,          class Comp = std::less<typename std::iterator_traits<InputIt>::value_type>,          class Alloc = std::allocator<typename std::iterator_traits<InputIt>::value_type>> multiset(InputIt, InputIt, Comp = Comp(), Alloc = Alloc())   -> multiset<typename std::iterator_traits<InputIt>::value_type, Comp, Alloc>;	(1)	(since C++17)
template<class Key, class Comp = std::less<Key>, class Alloc = std::allocator<Key>> multiset(std::initializer_list<Key>, Comp = Comp(), Alloc = Alloc())   -> multiset<Key, Comp, Alloc>;	(2)	(since C++17)
template<class InputIt, class Alloc> multiset(InputIt, InputIt, Alloc)   -> multiset<typename std::iterator_traits<InputIt>::value_type,            std::less<typename std::iterator_traits<InputIt>::value_type>, Alloc>;	(3)	(since C++17)
template<class Key, class Alloc> multiset(std::initializer_list<Key>, Alloc)   -> multiset<Key, std::less<Key>, Alloc>;	(4)	(since C++17)

These deduction guides are provided for multiset to allow deduction from an iterator range (overloads (1,3)) and std::initializer_list (overloads (2,4)). These overloads participate in overload resolution only if InputIt satisfies LegacyInputIterator, Alloc satisfies Allocator, and Comp does not satisfy Allocator.

Note: the extent to which the library determines that a type does not satisfy LegacyInputIterator is unspecified, except that as a minimum integral types do not qualify as input iterators. Likewise, the extent to which it determines that a type does not satisfy Allocator is unspecified, except that as a minimum the member type Alloc::value_type must exist and the expression std::declval<Alloc&>().allocate(std::size_t{}) must be well-formed when treated as an unevaluated operand.

Example

Run this code

#include <set>
int main() {
   std::multiset s = {1,2,3,4}; // guide #2 deduces std::multiset<int>
   std::multiset s2(s.begin(), s.end()); // guide #1 deduces std::multiset<int>
}