48 lines
1.1 KiB
Rust
48 lines
1.1 KiB
Rust
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use ::safer_ffi::prelude::*;
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/// A `struct` usable from both Rust and C
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#[derive_ReprC]
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#[repr(C)]
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#[derive(Debug, Clone, Copy)]
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pub struct Point {
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x: f64,
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y: f64,
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}
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/* Export a Rust function to the C world. */
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/// Returns the middle point of `[a, b]`.
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#[ffi_export]
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fn mid_point(a: Option<repr_c::Box<Point>>, b: Option<repr_c::Box<Point>>) -> repr_c::Box<Point> {
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let a = a.unwrap();
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let b = b.unwrap();
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repr_c::Box::new(Point {
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x: (a.x + b.x) / 2.,
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y: (a.y + b.y) / 2.,
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})
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}
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/// Pretty-prints a point using Rust's formatting logic.
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#[ffi_export]
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fn print_point(point: Option<repr_c::Box<Point>>) {
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println!("{:?}", point);
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}
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#[ffi_export]
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fn new_point(x: f64, y: f64) -> repr_c::Box<Point> {
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repr_c::Box::new(Point { x, y })
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}
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#[ffi_export]
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fn free_point(point: Option<repr_c::Box<Point>>) {
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drop(point)
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}
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/// The following test function is necessary for the header generation.
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#[::safer_ffi::cfg_headers]
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#[test]
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fn generate_headers() -> ::std::io::Result<()> {
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::safer_ffi::headers::builder()
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.to_file("bdk_ffi.h")?
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.generate()
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}
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