Per-axis version counter.

Returns the monotonic counter for axis on daf. Mirrors Julia DAF: incremented every time delete_axis is called (NOT on add_axis). Returns 0L if axis has never been deleted (including non-existent axes, to match wrapper semantics).

Usage

axis_version_counter(daf, axis)

Arguments

daf

A DafReader.

axis

Axis name (character scalar).

Value

integer(1).

See also

vector_version_counter(), matrix_version_counter()

Examples

# Mirrors readers.jl jldoctest at line 246.
m <- example_metacells_daf()
axis_version_counter(m, "type")           # 0L
#> [1] 0
delete_axis(m, "type")
add_axis(m, "type", c("Foo", "Bar", "Baz"))
axis_version_counter(m, "type")           # 1L
#> [1] 1