Inspect or use a Rust-like explicit trait

Inspect or use a Rust-like explicit trait

Usage

trait_methods(trait, inherited = TRUE)

impl_trait(
  trait,
  class,
  methods = list(),
  assoc_types = list(),
  assoc_consts = list(),
  replace = FALSE
)

trait_report(x, trait)

has_trait(x, trait)

assert_trait(x, trait, arg = deparse(substitute(x)))

trait_call(trait, method, x, ...)

trait_assoc_type(trait, x, name)

trait_assoc_const(trait, x, name)

Arguments

trait

A trait created by new_trait().

inherited

Include inherited methods from supertraits?

class

An S7 class or base class wrapper.

methods

Named list of method implementations. Omitted trait methods use their default implementation when one is available.

assoc_types

Named list of associated type values.

assoc_consts

Named list of associated constant values.

replace

Replace an existing implementation record and silence warnings about visible S7 methods?

x

An object or class.

arg

Name to use in error messages.

method

Method name within the trait.

...

Additional arguments passed to the S7 generic.

name

Associated item name.

Value

trait_methods() returns a named list of trait_method() objects. impl_trait() returns the stored implementation record, invisibly. trait_report() returns a one-row data frame. has_trait() returns a single logical value. assert_trait() returns x, unchanged. trait_call() returns the result of the underlying S7 generic. trait_assoc_type() and trait_assoc_const() return the stored associated item value.