Insert elements before the specified location.

iterator
insert(
    const_iterator pos,
    value const& v);
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iterator
insert(
    const_iterator pos,
    value&& v);
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iterator
insert(
    const_iterator pos,
    std::size_t count,
    value const& v);
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template<
    class InputIt>
iterator
insert(
    const_iterator pos,
    InputIt first,
    InputIt last);
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iterator
insert(
    const_iterator pos,
    std::initializer_list< value_ref > init);
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