These options will be used on objects of type 'externalptr'. By default this function is useless as nothing can be set, this is provided in case users wan to extend the method with other constructors.
opts_externalptr(constructor = c("default"), ...)An object of class <constructive_options/constructive_options_externalptr>
String. Name of the function used to construct the object.
Additional options used by user defined constructors through the opts object
Depending on constructor, we construct the object as follows:
"default" : We use a special function from the constructive