Replace container element.

iterator
replace(
    iterator pos,
    reference const& value);
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Replace container elements.

template<
    class FwdIt>
iterator
replace(
    iterator from,
    iterator to,
    FwdIt first,
    FwdIt last);
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iterator
replace(
    iterator from,
    iterator to,
    std::initializer_list< reference > init);
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Constructs a value at container position.

iterator
replace(
    iterator pos,
    string_view key,
    string_view value);
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Constructs a key-only value at container position.

iterator
replace(
    iterator pos,
    string_view key);
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