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-rw-r--r--lib/std/try.myr38
1 files changed, 38 insertions, 0 deletions
diff --git a/lib/std/try.myr b/lib/std/try.myr
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+use "result.use"
+use "option.use"
+use "fmt.use"
+
+pkg std =
+ generic try : (v : result(@a, @b) -> @a)
+ generic tryv : (v : result(@a, @b), d : @a -> @a)
+ generic get : (v : option(@a) -> @a)
+ generic getv : (v : option(@a), d : @a -> @a)
+;;
+
+generic try = {v
+ match v
+ | `Ok x: -> x
+ | `Fail m: fatal("error: {}\n", m)
+ ;;
+}
+
+generic tryv = {v, d
+ match v
+ | `Ok x: -> x
+ | `Fail m: -> d
+ ;;
+}
+
+generic get = {v
+ match v
+ | `Some x: -> x
+ | `None: fatal("error: option had `None\n")
+ ;;
+}
+
+generic getv = {v, d
+ match v
+ | `Some x: -> x
+ | `None: -> d
+ ;;
+}