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deductiongu...red_multiset(3) C++ Standard Libarydeductiongu...red_multiset(3) NAME deductionguidesforstd::unordered_multiset - deductionguidesforstd::un- ordered_multiset Synopsis Defined in header <unordered_set> template<class InputIt, class Hash = std::hash<typename std::iterator_traits<InputIt>::value_type>, class Pred = std::equal_to<typename std::iterator_traits<InputIt>::value_type>, class Alloc = std::allocator<typename (1) (since C++17) std::iterator_traits<InputIt>::value_type>> unordered_multiset(InputIt, InputIt, typename /*see below*/::size_type = /*see below*/, Hash = Hash(), Pred = Pred(), Alloc = Alloc()) -> unordered_multiset<typename std::iterator_traits<InputIt>::value_type, Hash, Pred, Alloc>; template<class T, class Hash = std::hash<T>, class Pred = std::equal_to<T>, class Alloc = std::allocator<T>> (2) (since C++17) unordered_multiset(std::initializer_list<T>, typename /*see below*/::size_type = /*see below*/, Hash = Hash(), Pred = Pred(), Alloc = Alloc()) -> unordered_multiset<T, Hash, Pred, Alloc>; template<class InputIt, class Alloc> unordered_multiset(InputIt, InputIt, typename /*see below*/::size_type, Alloc) -> unordered_multiset<typename (3) (since C++17) std::iterator_traits<InputIt>::value_type, std::hash<typename std::iterator_traits<InputIt>::value_type>, std::equal_to<typename std::iterator_traits<InputIt>::value_type>, Alloc>; template<class InputIt, class Hash, class Alloc> unordered_multiset(InputIt, InputIt, typename /*see below*/::size_type, Hash, Alloc) -> unordered_multiset<typename (4) (since C++17) std::iterator_traits<InputIt>::value_type, Hash, std::equal_to<typename std::iterator_traits<InputIt>::value_type>, Allocator>; template<class T, class Allocator> unordered_multiset(std::initializer_list<T>, typename /*see (5) (since C++17) below*/::size_type, Allocator) -> unordered_multiset<T, std::hash<T>, std::equal_to<T>, Alloc>; template<class T, class Hash, class Alloc> unordered_multiset(std::initializer_list<T>, typename /*see (6) (since C++17) below*/::size_type, Hash, Alloc) -> unordered_multiset<T, Hash, std::equal_to<T>, Alloc>; These deduction guides are provided for unordered_multiset to allow deduction from an iterator range (overloads (1,3,4)) and std::initializer_list (overloads (2,5.6)). This overload participates in overload resolution only if InputIt satisfies LegacyInputIterator, Alloc satisfies Allocator, neither Hash nor Pred satisfy Allocator, Hash is not an integral type Note: the extent to which the library determines that a type does not satisfy LegacyInputIterator is unspecified, except that as a minimum inte- gral types do not qualify as input iterators. Likewise, the extent to which it deter- mines 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. The size_type parameter type in these guides refers to the size_type member type of the type deduced by the deduction guide. Example // Run this code #include <unordered_set> int main() { std::unordered_multiset s = {1,2,3,4}; // guide #2 de- duces std::unordered_multiset<int> std::unordered_multiset s2(s.begin(), s.end()); // guide #1 de- duces std::unordered_multiset<int> } http://cppreference.com 2022.07.31 deductiongu...red_multiset(3)
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