[flat.multimap.cons]

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constexpr flat_multimap(key_container_type key_cont, mapped_container_type mapped_cont,
                        const key_compare& comp = key_compare();

Effects: Initializes c.keys with std::move(key_cont), c.values with std::move(mapped_cont), and compare with comp; sorts the range [begin(), end()) with respect to value_comp().

Complexity: Linear in N if the container arguments are already sorted with respect to value_comp() and otherwise

N log N, where N is the value of key_cont . size () before this call .

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constexpr flat_multimap(sorted_equivalent_t, key_container_type key_cont,
                        mapped_container_type mapped_cont,
                        const key_compare& comp = key_compare();

Effects: Initializes c.keys with std::move(key_cont), c.values with std::move(mapped_cont), and compare with comp.

Complexity: Constant.

23 Containers library [containers]

23.6 Container adaptors [container.adaptors]

23.6.9 Class template flat_multimap [flat.multimap]

23.6.9.3 Constructors [flat.multimap.cons]