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deduction guides for std::flat_multimap

From cppreference.com
 
 
 
 
Defined in header <flat_map>
template< class KeyContainer, class MappedContainer,

          class Compare = std::less<typename KeyContainer::value_type> >
flat_multimap( KeyContainer, MappedContainer, Compare = Compare() )
    -> flat_multimap<typename KeyContainer::value_type,
                     typename MappedContainer::value_type,

                     Compare, KeyContainer, MappedContainer>;
(1) (since C++23)
template< class KeyContainer, class MappedContainer, class Allocator >

flat_multimap( KeyContainer, MappedContainer, Allocator )
    -> flat_multimap<typename KeyContainer::value_type,
                     typename MappedContainer::value_type,
                     std::less<typename KeyContainer::value_type>,

                     KeyContainer, MappedContainer>;
(2) (since C++23)
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>;
(3) (since C++23)
template< class KeyContainer, class MappedContainer,

          class Compare = std::less<typename KeyContainer::value_type> >
flat_multimap( std::sorted_equivalent_t, KeyContainer, MappedContainer,
               Compare = Compare() )
    -> flat_multimap<typename KeyContainer::value_type,
                     typename MappedContainer::value_type,

                     Compare, KeyContainer, MappedContainer>;
(4) (since C++23)
template< class KeyContainer, class MappedContainer, class Allocator >

flat_multimap( std::sorted_equivalent_t, KeyContainer, MappedContainer,
               Allocator )
    -> flat_multimap<typename KeyContainer::value_type,
                     typename MappedContainer::value_type,
                     std::less<typename KeyContainer::value_type>,

                     KeyContainer, MappedContainer>;
(5) (since C++23)
template< class KeyContainer, class MappedContainer,

          class Compare, class Allocator>
flat_multimap( std::sorted_equivalent_t, KeyContainer, MappedContainer,
               Compare, Allocator )
    -> flat_multimap<typename KeyContainer::value_type,
                     typename MappedContainer::value_type,

                     Compare, KeyContainer, MappedContainer>;
(6) (since C++23)
template< class InputIter,

          class Compare = std::less</*iter-key-type*/<InputIter>> >
flat_multimap( InputIter, InputIter, Compare = Compare() )
    -> flat_multimap</*iter-key-type*/<InputIter>,

                     /*iter-mapped-type*/<InputIter>, Compare>;
(7) (since C++23)
template< class InputIter,

          class Compare = std::less</*iter-key-type*/<InputIter>> >
flat_multimap( std::sorted_equivalent_t, InputIter, InputIter,
               Compare = Compare() )
    -> flat_multimap</*iter-key-type*/<InputIter>,

                     /*iter-mapped-type*/<InputIter>, Compare>;
(8) (since C++23)
template< ranges::input_range R,

          class Compare = std::less</*range-key-type*/<R>>,
          class Allocator = allocator<byte> >
flat_multimap( std::from_range_t, R&&, Compare = Compare(),
               Allocator = Allocator() )
    -> flat_multimap</*range-key-type*/<R>, /*range-mapped-type*/<R>, Compare,
                     std::vector</*range-key-type*/<R>,
                                 /*alloc-rebind*/<Allocator,
                                                  /*range-key-type*/<R>>>,
                     std::vector</*range-mapped-type*/<R>,
                                 /*alloc-rebind*/<Allocator,

                                                  /*range-mapped-type*/<R>>>>;
(9) (since C++23)
template< ranges::input_range R, class Allocator >

flat_multimap( std::from_range_t, R&&, Allocator )
    -> flat_multimap</*range-key-type*/<R>, /*range-mapped-type*/<R>,
                     std::less</*range-key-type*/<R>>,
                     std::vector</*range-key-type*/<R>,
                                 /*alloc-rebind*/<Allocator,
                                                  /*range-key-type*/<R>>>,
                     std::vector</*range-mapped-type*/<R>,
                                 /*alloc-rebind*/<Allocator,

                                                  /*range-mapped-type*/<R>>>>;
(10) (since C++23)
template< class Key, class T, class Compare = std::less<Key> >

flat_multimap( std::initializer_list<pair<Key, T>>, Compare = Compare() )

    -> flat_multimap<Key, T, Compare>;
(11) (since C++23)
template< class Key, class T, class Compare = std::less<Key> >

flat_multimap( std::sorted_equivalent_t, std::initializer_list<pair<Key, T>>,
               Compare = Compare() )

    -> flat_multimap<Key, T, Compare>;
(12) (since C++23)

These deduction guides are provided for to allow deduction from:

1) A key-container, a mapped-container and a comparator.
2) A key-container, a mapped-container and an allocator.
3) A key-container, a mapped-container, a comparator and an allocator.
4) The std::sorted_equivalent_t tag, a key-container, a mapped-container and a comparator.
5) The std::sorted_equivalent_t tag, a key-container, a mapped-container and an allocator.
6) The std::sorted_equivalent_t tag, a key-container, a mapped-container, a comparator and an allocator.
7) An iterator range and a comparator.
8) The std::sorted_equivalent_t tag, an iterator range and a comparator.
9) The std::from_range_t tag, an input_range range, a comparator and an allocator.
10) The std::from_range_t tag, an input_range range and an allocator.
11) The std::initializer_list and a comparator.
12) The std::sorted_equivalent_t tag, the std::initializer_list and a comparator.

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