Assign elements
                void
assign(
    initializer_list<param_view> init);            
        Declared in file <src/params_ref.cpp> at line 55
This function replaces the entire contents of the view with the params in the initializer-list .
All iterators are invalidated.
The strings referenced by the inputs must not come from the underlying url, or else the behavior is undefined.
url u;
u.params().assign( {{ "first", "John" }, { "last", "Doe" }} );
Linear in `init.size()`.
Strong guarantee. Calls to allocate may throw.