Function that checks that a given object is a Graph and throws an error if not.
Graph
assert_graph(x)
(any) Object to check.
any
Graph invisible(x)
invisible(x)
Other Graph operators: %>>%, as_graph, as_pipeop, assert_pipeop, greplicate, gunion
%>>%
as_graph
as_pipeop
assert_pipeop
greplicate
gunion