Insert element in container.

iterator
insert(
    iterator before,
    reference const& v);
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Insert elements in container.

iterator
insert(
    iterator before,
    std::initializer_list< reference > init);
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template<
    class FwdIt>
iterator
insert(
    iterator before,
    FwdIt first,
    FwdIt last);
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Constructs a key-only query parameter at container position.

iterator
insert(
    iterator before,
    string_view key,
    string_view value);
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Constructs a value at container position.

iterator
insert(
    iterator before,
    string_view key);
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