Return the position where the option with the specified name has been entered on the command line (i.e., the index in the argv argument to the parse method). If the option was specified multiple times on the command line, return the position of the first instance. If the option was specified as an environment variable but not on the command line, return -2. If the option was not specified, return -1. The behavior is undefined unless the option is of scalar type.
Declared in <balcl_commandline.h>
int
position(std::string_view const& name) const;