rustler 0.6.0

Safe Rust wrappers for creating Erlang NIF functions
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

use super::nif_interface;
use super::nif_interface::{ NIF_ENV, NIF_TERM };
use std::mem;

pub fn get_map_value(env: NIF_ENV, map: NIF_TERM, key: NIF_TERM) -> Option<NIF_TERM> {
    let mut result: NIF_TERM = unsafe { mem::uninitialized() };
    let success = unsafe { nif_interface::enif_get_map_value(env, map, key, &mut result as *mut NIF_TERM) };

    if success != 1 {
        return None;
    }
    Some(result)
}

pub fn get_map_size(env: NIF_ENV, map: NIF_TERM) -> Option<usize> {
    let mut size: nif_interface::size_t = unsafe { mem::uninitialized() };
    let success = unsafe { nif_interface::enif_get_map_size(env, map, &mut size as *mut nif_interface::size_t) };

    if success != 1 {
        return None;
    }
    Some(size as usize)
}

pub fn map_new(env: NIF_ENV) -> NIF_TERM {
    unsafe { nif_interface::enif_make_new_map(env) }
}

pub fn map_put(env: NIF_ENV, map: NIF_TERM, key: NIF_TERM, value: NIF_TERM) -> Option<NIF_TERM> {
    let mut result: NIF_TERM = unsafe { mem::uninitialized() };
    let success = unsafe { nif_interface::enif_make_map_put(env, map, key, value, &mut result as *mut NIF_TERM) };

    if success != 1 {
        return None;
    }
    Some(result)
}