Macro ocaml_interop::impl_to_ocaml_record [−][src]
macro_rules! impl_to_ocaml_record { ($rust_typ:ty => $ocaml_typ:ident { $($field:ident : $ocaml_field_typ:ty $(=> $conv_expr:expr)?),+ $(,)? }) => { ... }; ($both_typ:ident { $($t:tt)* }) => { ... }; }
Expand description
Implements ToOCaml
for mapping a Rust record into an OCaml record.
It is important that the order of the fields remains the same as in the OCaml type declaration.
Examples
struct MyStruct { int_field: u8, string_field: String, } // Assuming an OCaml record declaration like: // // type my_struct = { // int_field: int; // string_field: string; // } // // NOTE: What is important is the order of the fields, not their names. impl_to_ocaml_record! { // Optionally, if Rust and OCaml types don't match: // RustType => OCamlType { ... } MyStruct { // optionally `=> expr` can be used to preprocess the field value // before the conversion into OCaml takes place. // Inside the expression, a variable with the same name as the field // is bound to a reference to the field value. int_field: OCamlInt => { *int_field as i64 }, string_field: String, } }