[#CA83D173B82948749254660C20FE11D9E0E0F083]
Append elements
templateiterator append( FwdIt first, FwdIt last);
This function appends a range of params to the view.
The `end()` iterator is invalidated.
The strings referenced by the inputs must not come from the underlying url, or else the behavior is undefined.
std::is_convertible< std::iterator_traits< FwdIt >::reference_type, param_view >::value == true
Linear in `this->url().encoded_query().size()`.
Strong guarantee. Calls to allocate may throw.