pub fn ensure_init()Expand description
Initializes igraph for the calling thread, once.
It installs the error and warning handlers of this crate
(igraph_set_error_handler,
igraph_set_warning_handler), gives the
thread its own randomly seeded default random number generator (in
igraph 1.0.0 and 1.0.1 the default generator pointer is thread-local,
but it initially points to a single global generator shared by all
threads, which would make concurrent random functions race; see
rng), and calls igraph_setup().
Every safe wrapper calls it (it’s cheap after the first time), so users
rarely need to call it explicitly. It is idempotent.