diff options
Diffstat (limited to 'backends/fstar')
| -rw-r--r-- | backends/fstar/Primitives.fst | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/backends/fstar/Primitives.fst b/backends/fstar/Primitives.fst index 9a06b596..bf0f9078 100644 --- a/backends/fstar/Primitives.fst +++ b/backends/fstar/Primitives.fst @@ -26,14 +26,19 @@ type result (a : Type0) : Type0 = | Return : v:a -> result a | Fail : e:error -> result a -// Monadic bind and return. -// Re-definining those allows us to customize the result of the monadic notations -// like: `y <-- f x;` -let return (#a : Type0) (x:a) : result a = Return x -let bind (#a #b : Type0) (m : result a) (f : a -> result b) : result b = - match m with - | Return x -> f x - | Fail e -> Fail e +// Monadic return operator +unfold let return (#a : Type0) (x : a) : result a = Return x + +// Monadic bind operator. +// Allows to use the notation: +// ``` +// let* x = y in +// ... +// ``` +unfold let (let*) (#a #b : Type0) (m: result a) (f: a -> result b) : result b = + match m with + | Return x -> f x + | Fail e -> Fail e // Monadic assert(...) let massert (b:bool) : result unit = if b then Return () else Fail Failure @@ -52,7 +57,7 @@ let mem_replace_fwd (a : Type0) (x : a) (y : a) : a = x let mem_replace_back (a : Type0) (x : a) (y : a) : a = y (*** Scalars *) -/// Rk.: most of the following code was at least partially generated +/// Rem.: most of the following code was partially generated let isize_min : int = -9223372036854775808 // TODO: should be opaque let isize_max : int = 9223372036854775807 // TODO: should be opaque @@ -291,4 +296,3 @@ let vec_index_mut_fwd (a : Type0) (v : vec a) (i : usize) : result a = if i < length v then Return (index v i) else Fail Failure let vec_index_mut_back (a : Type0) (v : vec a) (i : usize) (nx : a) : result (vec a) = if i < length v then Return (list_update v i nx) else Fail Failure - |