rustler 0.37.3

Safe Rust wrappers for creating Erlang NIF functions
Documentation 
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pub(crate) trait DynNifFiller {
    fn write<T: Copy>(&self, field: &mut Option<T>, name: &str);
}

#[cfg(not(target_os = "windows"))]
mod internal {
    use std::ffi::OsStr;

    use super::DynNifFiller;
    use libloading::os::unix::{Library, RTLD_GLOBAL, RTLD_NOW};

    pub(crate) struct DlsymNifFiller {
        lib: libloading::Library,
    }

    impl DlsymNifFiller {
        pub(crate) fn new() -> Self {
            let lib = unsafe { Library::open(None::<&OsStr>, RTLD_NOW | RTLD_GLOBAL) };
            DlsymNifFiller {
                lib: lib.unwrap().into(),
            }
        }
    }

    impl DynNifFiller for DlsymNifFiller {
        fn write<T: Copy>(&self, field: &mut Option<T>, name: &str) {
            let symbol = unsafe { self.lib.get::<T>(name.as_bytes()).unwrap() };
            *field = Some(*symbol);
        }
    }

    pub(crate) fn new() -> impl DynNifFiller {
        DlsymNifFiller::new()
    }
}

#[cfg(target_os = "windows")]
mod internal {
    use super::*;

    pub struct NullNifFiller;
    impl DynNifFiller for NullNifFiller {
        fn write<T: Copy>(&self, _field: &mut Option<T>, _name: &str) {}
    }

    pub fn new() -> impl DynNifFiller {
        NullNifFiller
    }
}

pub(crate) use internal::new;