Macro ocaml_interop::ocaml_export [−][src]
macro_rules! ocaml_export {
{ } => { ... };
{
fn $name : ident($cr : ident, $($args : tt) *) -> f64 $body : block
$($t : tt) *
} => { ... };
{
fn $name : ident($cr : ident, $($args : tt) *) $(-> $rtyp : ty) ? $body :
block $($t : tt) *
} => { ... };
{
fn $name : ident($($invalid_args : tt) *) $(-> $rtyp : ty) ? $body : block
$($t : tt) *
} => { ... };
}
Expand description
Defines Rust functions callable from OCaml.
The first argument in these functions declarations is a name to bind a &mut
OCamlRuntime
.
Arguments and return values must be of type OCamlRef
<T>
, or f64
in the case of unboxed floats.
The return type defaults to OCaml
<()>
when omitted.
Examples
ocaml_export! {
fn rust_twice(cr, num: OCamlRef<OCamlInt>) -> OCaml<OCamlInt> {
let num: i64 = num.to_rust(cr);
unsafe { OCaml::of_i64_unchecked(num * 2) }
}
fn rust_twice_boxed_i32(cr, num: OCamlRef<OCamlInt32>) -> OCaml<OCamlInt32> {
let num: i32 = num.to_rust(cr);
let result = num * 2;
result.to_ocaml(cr)
}
fn rust_add_unboxed_floats_noalloc(_cr, num: f64, num2: f64) -> f64 {
num * num2
}
fn rust_twice_boxed_float(cr, num: OCamlRef<OCamlFloat>) -> OCaml<OCamlFloat> {
let num: f64 = num.to_rust(cr);
let result = num * 2.0;
result.to_ocaml(cr)
}
fn rust_increment_ints_list(cr, ints: OCamlRef<OCamlList<OCamlInt>>) -> OCaml<OCamlList<OCamlInt>> {
let mut vec: Vec<i64> = ints.to_rust(cr);
for i in 0..vec.len() {
vec[i] += 1;
}
vec.to_ocaml(cr)
}
fn rust_make_tuple(cr, fst: OCamlRef<String>, snd: OCamlRef<OCamlInt>) -> OCaml<(String, OCamlInt)> {
let fst: String = fst.to_rust(cr);
let snd: i64 = snd.to_rust(cr);
let tuple = (fst, snd);
tuple.to_ocaml(cr)
}
}