Deduce the template parameters KEY and VALUE from the value_type of the initializer_list supplied to the constructor of multimap. This deduction guide does not participate unless the supplied allocator is convertible to bsl::allocator<bsl::pair<const KEY, VALUE>>.
Declared in <bslstl_multimap.h>
template<
class KEY,
class VALUE,
class ALLOC,
class DEFAULT_ALLOCATOR = bsl::allocator<bsl::pair<KEY const, VALUE>>>
requires bsl::is_convertible_v<ALLOC *, DEFAULT_ALLOCATOR>
multimap<KEY, VALUE>(
std::initializer_list<pair<KEY const, VALUE>>,
ALLOC*) -> multimap<KEY, VALUE>;