Check if an object is of class das_df, or coerce it if possible.
Usage
as_das_df(x)
# S3 method for class 'das_df'
as_das_df(x)
# S3 method for class 'data.frame'
as_das_df(x)Details
Only data frames can be coerced to an object of class das_df.
If x does not have column names and classes as specified in das_df-class,
then the function returns an error message detailing the first column that does not
meet the requirements of a das_df object.