ReturnTypeSpecification

the type specification.
    This should be an object of class ClassNameOrExpression
    or coercible to one.

type

the instance that is to be populated and returned.


  This function is a constructor for a class that
  represents information only about the return type
  of a function and explicitly has no information about
  the parameters.


programming

interface

A prototype for a mechanism for specifying the types of
parameters and the return value for an R function. This is
meta-information that can be used to generate stubs for servers
and various interfaces to these functions. Additionally, the
arguments in a call to a typed function can be validated using
the type specifications.
We allow types to be specified as either
i) by class name using either inheritance -  is(x, className),
or strict instance of - class(x) %in% className, or
ii) a dynamic test given as an R expression which is evaluated
at run-time.
More precise information and interesting tests can be done via
ii), but it is harder to use this information as meta-data as
it requires more effort to interpret it and it is of course
run-time information. It is typically more meaningful.

Duncan Lang

TypeInfo

Optional Type Specification Prototype

ReturnTypeSpecification function

This function is a constructor for a class that
  represents information only about the return type
  of a function and explicitly has no information about
  the parameters.

ReturnTypeSpecification: Constructor for specifying information about only the return type

Description

Usage

Arguments

Value

See Also

Examples