Attribute Macro init 

#[init]

Designate a one-time library-load initialization function. See init. Designate an initialization function to run once, when this library is loaded via Wolfram LibraryLink — distinct from [export], which wraps a function called on every invocation from Wolfram.

The annotated function must take no arguments and return (). #[init] can be applied to at most one function in a library, and a library isn’t required to define one at all.

Behind the scenes, the macro generates a WolframLibrary_initialize() C symbol — the well-known entry point the Wolfram Kernel calls automatically when the library is loaded, before any exported function runs.

Panics

Panics inside the #[init] function are caught and reported to the Kernel as an error code. If initialization panics, the Kernel will not load any of this library’s other exported functions.

Example

use wolfram_export::init;

#[init]
fn init_my_library() {
    println!("library is now initialized");
}