params_ref::set (2 of 2 overloads)

Set a value.

iterator
set(
    string_view key,
    string_view value,
    ignore_case_param ic = {});

This function performs one of two actions depending on the value of this->contains( key, ic ).

If key is contained in the view then one of the matching elements has its value changed to the specified value. The remaining elements with a matching key are erased. Otherwise,
If key is not contained in the view, then the function apppends the param { key, value }.

All iterators are invalidated.

url u( "?id=42&id=69" );

u.params().set( "id", "none" );

assert( u.params().count( "id" ) == 1 );

this->count( key, ic ) == 1 && this->find( key, ic )->value == value

Linear in this->url().encoded_query().size().

Strong guarantee. Calls to allocate may throw.

An iterator to the appended or modified element.

Name	Description
`key`	The key to match. By default, a case-sensitive comparison is used.
`value`	The value to assign. The empty string still counts as a value. That is, `has_value` for the element will be true.
`ic`	An optional parameter. If the value `ignore_case` is passed here, the comparison will be case-insensitive.