params::replace (5 of 5 overloads)

Constructs a key-only value at container position.

iterator
replace(
    iterator pos,
    string_view key);

This function constructs a value at the specified container position. The new value has a specified query key and no query mapped value.

Iterator to position where the element was constructed

Name	Description
`pos`	Position where the new element should be constructed
`key`	The key of the new element