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use caml_ffi_types::{Cint, Clong, Value};
extern {
pub fn long_val(l: Value) -> Clong;
pub fn int_val(i: Value) -> Cint;
pub fn val_long(l: Clong) -> Value;
pub fn val_int(i: Cint) -> Value;
pub fn val_true() -> Value;
pub fn val_false() -> Value;
pub fn val_unit() -> Value;
}
pub fn caml_unit() -> Value {
unsafe { val_unit() }
}
pub fn caml_false() -> Value {
unsafe { val_false() }
}
pub fn caml_true() -> Value {
unsafe { val_true() }
}
pub fn caml_to_int(i: Value) -> Cint {
unsafe { int_val(i) }
}
pub fn caml_of_int(i: Cint) -> Value {
unsafe { val_int(i) }
}
pub fn caml_to_long(l: Value) -> Clong {
unsafe { long_val(l) }
}
pub fn caml_of_long(l: Clong) -> Value {
unsafe { val_long(l) }
}
fn is_block(x: Value) -> bool {
(x & 1) == 0
}
fn hd_val(x: Value) -> usize {
assert!(is_block(x));
unsafe {
*(x as *const usize).offset(-1)
}
}
pub fn tag_of_value(x: Value) -> u8 {
assert!(is_block(x));
(hd_val(x) & 0xff) as u8
}