This abstract class provides a set of useful default methods that makes it
considerably easier to get started with a new S3 vector class. See
`vignette("s3-vector")`

to learn how to use it to create your own S3
vector classes.

new_vctr(.data, ..., class = character())

.data | Foundation of class. Must be a vector |
---|---|

... | Name-value pairs defining attributes |

class | Name of subclass. |

The vctr class provides methods for many base generics using a smaller set of generics defined by this package. Generally, you should think carefully before overriding any of the methods that vctrs implements for you as they've been carefully planned to be internally consistent.

`[[`

and`[`

use`NextMethod()`

dispatch to the underlying base function, then restore attributes with`vec_restore()`

.`rep()`

and`length<-`

work similarly.`[[<-`

and`[<-`

cast`value`

to same type as`x`

, then call`NextMethod()`

.`as.logical()`

,`as.integer()`

,`as.numeric()`

,`as.character()`

,`as.Date()`

and`as.POSIXct()`

methods call`vec_cast()`

. The`as.list()`

method calls`[[`

repeatedly, and the`as.data.frame()`

method uses a standard technique to wrap a vector in a data frame.`as.factor()`

,`as.ordered()`

and`as.difftime()`

are not generic functions in base R, but have been reimplemented as generics in the`generics`

package.`vctrs`

extends these and calls`vec_cast()`

. To inherit this behavior in a package, import and re-export the generic of interest from`generics`

.`==`

,`!=`

,`unique()`

,`anyDuplicated()`

, and`is.na()`

use`vec_proxy_equal()`

.`<`

,`<=`

,`>=`

,`>`

,`min()`

,`max()`

,`median()`

,`quantile()`

, and`xtfrm()`

methods use`vec_proxy_compare()`

.`+`

,`-`

,`/`

,`*`

,`^`

,`%%`

,`%/%`

,`!`

,`&`

, and`|`

operators use`vec_arith()`

.Mathematical operations including the Summary group generics (

`max`

,`min`

,`range`

,`prod`

,`sum`

,`any`

,`all`

), the Math group generics (`abs`

,`sign`

, etc),`mean()`

,`is.nan()`

,`is.finite()`

, and`is.infinite()`

use`vec_math()`

.`dims()`

,`dims<-()`

,`dimnames()`

,`dimnames<-`

,`levels()`

, and`levels<-`

methods throw errors.