[#7E39725B150943241C326A0E4CC2C3EE902B72F5]
Append elements
iterator append(std::initializer_listinit);
This function appends the params in an initializer-list to the view.
The `end()` iterator is invalidated.
url u;
u.params().append({ { "first", "John" }, { "last", "Doe" } });
Linear in `this->url().encoded_query().size()`.
Strong guarantee. Calls to allocate may throw.