Append params
This function appends a param to the view.
The end() iterator is invalidated.
url u;
u.encoded_params().append( { "first", "John" } );
Linear in this->url().encoded_query().size().
Strong guarantee. Calls to allocate may throw. Exceptions thrown on invalid input.
| Name | Thrown on | 
|---|---|
| system_error | pcontains an invalid percent-encoding. | 
| Name | Description | 
|---|---|
| p | The param to append. |