S7_inherits: Does this object inherit from an S7 class?
In S7: An Object Oriented System Meant to Become a Successor to S3 and S4

S7_inherits

R Documentation

Does this object inherit from an S7 class?

Description

S7_inherits() returns TRUE or FALSE.
check_is_S7() throws an error if x isn't the specified class.

Usage

S7_inherits(x, class = NULL)

check_is_S7(x, class = NULL, arg = deparse(substitute(x)))

Arguments

`x`	An object
`class`	An S7 class or `NULL`. If `NULL`, tests whether `x` is an S7 object without testing for a specific class.
`arg`	Argument name used in error message.

Value

S7_inherits() returns a single TRUE or FALSE.
check_is_S7() returns nothing; it's called for its side-effects.

Note

Starting with R 4.3.0, base::inherits() can accept an S7 class as the second argument, supporting usage like inherits(x, Foo).

Examples

Foo1 <- new_class("Foo1")
Foo2 <- new_class("Foo2")

S7_inherits(Foo1(), Foo1)
check_is_S7(Foo1())
check_is_S7(Foo1(), Foo1)

S7_inherits(Foo1(), Foo2)
try(check_is_S7(Foo1(), Foo2))

if (getRversion() >= "4.3.0")
  inherits(Foo1(), Foo1)

S7 documentation built on Nov. 15, 2025, 1:07 a.m.