Any values of the wrong class will cause failure of validation. This is
particularly useful for custom vectors of for list types (e.g. list(of_type(lm)))
Usage
type.of_type(type, .not_null = FALSE)
Arguments
- type
the class of the type we are checking as a symbol
- .not_null
are NULL values allowed (for list column entries only)
Value
a function that can check the input is of the correct type.