Returns a proxy object (i.e. an atomic vector or data frame of atomic
vectors). For vctrs, this determins the behaviour of order() and
sort() (via xtfrm()); <, >, >= and <= (via vec_compare());
and min(), max(), median(), and quantile().
vec_proxy_compare(x)A vector x.
A 1d atomic vector or a data frame.
The default method assumes that all classes built on top of atomic
vectors or records are orderable. If your class is not, you will need
to provide a vec_proxy_compare() method that throws an error. Note
that the default vec_proxy_equal() method calls vec_proxy_compare() so
if your object is equal-able but not comparable, you'll need to provide
methods for both generics.