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Default cast and ptype2 methods

Source: R/cast.R, R/type2.R
vec_default_ptype2.Rd

These functions are automatically called when no vec_ptype2() or vec_cast() method is implemented for a pair of types.

  • They apply special handling if one of the inputs is of type AsIs or sfc.

  • They attempt a number of fallbacks in cases where it would be too inconvenient to be strict:

    • If the class and attributes are the same they are considered compatible. vec_default_cast() returns x in this case.

    • In case of incompatible data frame classes, they fall back to data.frame. If an incompatible subclass of tibble is involved, they fall back to tbl_df.

  • Otherwise, an error is thrown with stop_incompatible_type() or stop_incompatible_cast().

Usage

vec_default_cast(x, to, ..., x_arg = "", to_arg = "", call = caller_env())

vec_default_ptype2(x, y, ..., x_arg = "", y_arg = "", call = caller_env())

Arguments

x

Vectors to cast.

to

Type to cast to. If NULL, x will be returned as is.

...

For vec_cast_common(), vectors to cast. For vec_cast(), vec_cast_default(), and vec_restore(), these dots are only for future extensions and should be empty.

x_arg

Argument name for x, used in error messages to inform the user about the locations of incompatible types (see stop_incompatible_type()).

to_arg

Argument name to used in error messages to inform the user about the locations of incompatible types (see stop_incompatible_type()).

call

The execution environment of a currently running function, e.g. caller_env(). The function will be mentioned in error messages as the source of the error. See the call argument of abort() for more information.