[#98262D7ACAFC245758EF1A07A66B3325A46C5D4A]
Set a value
iterator set( iterator pos, core::string_view value);
This function replaces the value of an element at the specified position.
All iterators that are equal to `pos` or come after are invalidated.
url u( "?id=42&id=69" );
u.params().set( u.params().begin(), "none" );
assert( u.encoded_query() == "id=none&id=69" );
Linear in `this->url().encoded_query().size()`.
Strong guarantee. Calls to allocate may throw.