R Under development (unstable) (2024-09-04 r87094 ucrt) -- "Unsuffered Consequences"
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> suppressPackageStartupMessages(library(sf))
> c(st_point(1:2), st_point(5:6))
MULTIPOINT ((1 2), (5 6))
> c(st_point(1:2), st_multipoint(matrix(5:8,2)))
MULTIPOINT ((1 2), (5 7), (6 8))
> c(st_multipoint(matrix(1:4,2)), st_multipoint(matrix(5:8,2)))
MULTIPOINT ((1 3), (2 4), (5 7), (6 8))
> c(st_linestring(matrix(1:6,3)), st_linestring(matrix(11:16,3)))
MULTILINESTRING ((1 4, 2 5, 3 6), (11 14, 12 15, 13 16))
> c(st_linestring(matrix(1:6,3)), st_multilinestring(list(matrix(11:16,3))))
MULTILINESTRING ((11 14, 12 15, 13 16), (1 4, 2 5, 3 6))
> c(st_multilinestring(list(matrix(1:6,3))), st_multilinestring(list(matrix(11:16,3))))
MULTILINESTRING ((1 4, 2 5, 3 6), (11 14, 12 15, 13 16))
> pl = list(rbind(c(0,0), c(1,0), c(1,1), c(0,1), c(0,0)))
> c(st_polygon(pl), st_polygon(pl))
MULTIPOLYGON (((0 0, 1 0, 1 1, 0 1, 0 0)), ((0 0, 1 0, 1 1, 0 1, 0 0)))
> c(st_polygon(pl), st_multipolygon(list(pl)))
MULTIPOLYGON (((0 0, 1 0, 1 1, 0 1, 0 0)), ((0 0, 1 0, 1 1, 0 1, 0 0)))
> c(st_linestring(matrix(1:6,3)), st_point(1:2))
GEOMETRYCOLLECTION (LINESTRING (1 4, 2 5, 3 6), POINT (1 2))
> c(st_geometrycollection(list(st_point(1:2), st_linestring(matrix(1:6,3)))),
+   st_geometrycollection(list(st_multilinestring(list(matrix(11:16,3))))))
GEOMETRYCOLLECTION (POINT (1 2), LINESTRING (1 4, 2 5, 3 6), MULTILINESTRING ((11 14, 12 15, 13 16)))
> c(st_geometrycollection(list(st_point(1:2), st_linestring(matrix(1:6,3)))),
+   st_multilinestring(list(matrix(11:16,3))), st_point(5:6), 
+   st_geometrycollection(list(st_point(10:11))))
GEOMETRYCOLLECTION (MULTILINESTRING ((11 14, 12 15, 13 16)), POINT (5 6), POINT (1 2), LINESTRING (1 4, 2 5, 3 6), POINT (10 11))
> head(st_point(0:1), 2)
POINT (0 1)
> 
> # Ops.sfg:
> ls = st_linestring(rbind(c(0,0),c(0,1)))
> pt = st_point(1:0)
> ls | pt
GEOMETRYCOLLECTION (LINESTRING (0 0, 0 1), POINT (1 0))
> ls / pt
LINESTRING (0 0, 0 1)
> ls & pt
GEOMETRYCOLLECTION EMPTY
> ls %/% pt
GEOMETRYCOLLECTION (LINESTRING (0 0, 0 1), POINT (1 0))
> # arith:
> ls + pt
LINESTRING (1 0, 1 1)
> ls - pt
LINESTRING (-1 0, -1 1)
> ls * pt
LINESTRING (0 0, 0 0)
> ls / pt
LINESTRING (0 0, 0 1)
> # unary:
> +pt
POINT (1 0)
> -pt
POINT (-1 0)
> try(!pt)
Error in Ops.sfg(pt) : unary ! not defined for "sfg" objects
> 
> proc.time()
   user  system elapsed 
   0.68    0.07    0.76