boost::urls::params_ref::unset
Remove the value on an element
Description
This function removes the value of
an element at the specified position.
After the call returns, has_value
for the element is false.
All iterators that are equal to
pos or come after are invalidated.
url u( "?first=John&last=Doe" );
u.params().unset( u.params().begin() );
assert( u.encoded_query() == "first&last=Doe" );