opendp 0.14.2-dev.20260401.2

A library of differential privacy algorithms for the statistical analysis of sensitive private data.
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
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56

use std::convert::TryFrom;
use std::iter::Sum;
use std::os::raw::{c_char, c_uint};

use crate::core::{FfiResult, IntoAnyTransformationFfiResultExt};

use crate::error::Fallible;
use crate::ffi::any::{AnyObject, AnyTransformation, Downcast};
use crate::ffi::util::Type;
use crate::traits::Integer;
use crate::transformations::make_sized_bounded_int_checked_sum;

#[unsafe(no_mangle)]
pub extern "C" fn opendp_transformations__make_sized_bounded_int_checked_sum(
    size: c_uint,
    bounds: *const AnyObject,
    T: *const c_char,
) -> FfiResult<*mut AnyTransformation> {
    fn monomorphize<T>(size: usize, bounds: *const AnyObject) -> Fallible<AnyTransformation>
    where
        T: 'static + Integer,
        for<'a> T: Sum<&'a T>,
    {
        let bounds = try_as_ref!(bounds).downcast_ref::<(T, T)>()?.clone();
        make_sized_bounded_int_checked_sum::<T>(size, bounds).into_any()
    }
    let size = size as usize;
    let T = try_!(Type::try_from(T));
    dispatch!(monomorphize, [(T, @integers)], (size, bounds)).into()
}

#[cfg(test)]
mod tests {
    use crate::core;
    use crate::error::Fallible;
    use crate::ffi::any::{AnyObject, Downcast};
    use crate::ffi::util;
    use crate::ffi::util::ToCharP;

    use super::*;

    #[test]
    fn test_make_sized_bounded_int_checked_sum_ffi() -> Fallible<()> {
        let transformation =
            Result::from(opendp_transformations__make_sized_bounded_int_checked_sum(
                3 as c_uint,
                util::into_raw(AnyObject::new((0i32, 10i32))),
                "i32".to_char_p(),
            ))?;
        let arg = AnyObject::new_raw(vec![1, 2, 3]);
        let res = core::opendp_core__transformation_invoke(&transformation, arg);
        let res: i32 = Fallible::from(res)?.downcast()?;
        assert_eq!(res, 6);
        Ok(())
    }
}