Deduce the template parameters KEY and VALUE from the value_type of the iterators supplied to the constructor of unordered_multimap. This deduction guide does not participate unless the supplied allocator is convertible to bsl::allocator<bsl::pair<const KEY, VALUE>>.
Declared in <bslstl_unorderedmultimap.h>
template<
class INPUT_ITERATOR,
class ALLOC,
class KEY = BloombergLP::bslstl::IteratorUtil::IterKey_t<INPUT_ITERATOR>,
class VALUE = BloombergLP::bslstl::IteratorUtil::IterMapped_t<INPUT_ITERATOR>,
class DEFAULT_ALLOCATOR = bsl::allocator<bsl::pair<KEY const, VALUE>>>
requires bsl::is_convertible_v<ALLOC *, DEFAULT_ALLOCATOR>
unordered_multimap<KEY, VALUE>(
INPUT_ITERATOR,
INPUT_ITERATOR,
ALLOC*) -> unordered_multimap<KEY, VALUE>;